Re: [RFC 4/8] pinctrl:stixxxx: Add pinctrl and pinconf support.

From: Jean-Christophe PLAGNIOL-VILLARD
Date: Wed May 08 2013 - 11:22:39 EST

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On 15:11 Wed 08 May , Srinivas KANDAGATLA wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
>
> This patch add pinctrl support to ST SoCs.
>
> About hardware:
> ST Set-Top-Box parts have two blocks called PIO and PIO-mux which handle
> pin configurations.
>
> Each multi-function pin is controlled, driven and routed through the PIO
> multiplexing block. Each pin supports GPIO functionality (ALT0) and
> multiple alternate functions(ALT1 - ALTx) that directly connect the pin
> to different hardware blocks. When a pin is in GPIO mode, Output Enable
> (OE), Open Drain(OD), and Pull Up (PU) are driven by the related PIO
> block. Otherwise the PIO multiplexing block configures these parameters
> and retiming the signal.
>
g> About driver:
> This pinctrl driver manages both PIO and PIO-mux block using pinctrl,
> pinconf, pinmux, gpio subsystems. All the pinctrl related config
> information can only come from device trees.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
> CC: Stephen Gallimore <stephen.gallimore@xxxxxx>
> CC: Stuart Menefy <stuart.menefy@xxxxxx>
> ---
> .../bindings/pinctrl/pinctrl-stixxxx.txt | 160 +++
> drivers/pinctrl/Kconfig | 13 +
> drivers/pinctrl/Makefile | 1 +
> drivers/pinctrl/pinctrl-stixxxx.c | 1151 ++++++++++++++++++++
> drivers/pinctrl/pinctrl-stixxxx.h | 197 ++++
the pinctrl is present in older SoC ST40 not only stixxx

and you must provide a proper name not stixxxx

> 5 files changed, 1522 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-stixxxx.txt
> create mode 100644 drivers/pinctrl/pinctrl-stixxxx.c
> create mode 100644 drivers/pinctrl/pinctrl-stixxxx.h
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-stixxxx.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-stixxxx.txt
> new file mode 100644
> index 0000000..b0a93b5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-stixxxx.txt
> @@ -0,0 +1,160 @@
> +*ST pin controller.
> +
> +Each multi-function pin is controlled, driven and routed through the
> +PIO multiplexing block. Each pin supports GPIO functionality (ALT0)
> +and multiple alternate functions(ALT1 - ALTx) that directly connect
> +the pin to different hardware blocks.
> +
> +When a pin is in GPIO mode, Output Enable (OE), Open Drain(OD), and
> +Pull Up (PU) are driven by the related PIO block.
HighZ too

this driver look very similar with AT91 we should consolidate at binding and C
level
>
> ---
> +
> +ST pinctrl driver controls PIO multiplexing block and also interacts with
> +gpio driver to configure a pin.
> +
> +Required properties: (PIO multiplexing block)
> +- compatible : should be "st,stixxxx-pinctrl"
> + each subnode should set "st,stixxxx-gpio"
> + as compatible for each gpio-controller bank.
first soc where the IP is present
> +- gpio-controller : Indicates this device is a GPIO controller
> +- #gpio-cells : Should be one. The first cell is the pin number.
> +- #retime-delay-cells : Should be number of possible retime delays.
> +- st,retime-in-delay : Should be array of delays in nsecs.
> +- st,retime-out-delay : Should be array of delays in nsecs.
> +- retime-style : Should indicate which type of retime is used.
> + possible values are "none", "packed" and "dedicated".
always prefix st, when specific property
st,
> +- st,retime-offset : phandle to retime offsets in retime registers.
> + These are not necessary for "dedicated" retime-style registers.
> + - clk1notclk0 : Should define offset for clk1not clk0 in retime register.
> + - delay-lsb : Should define offset for delay-lsb in retime register.
> + - delay-msb : Should define offset for delay msb in retime register.
> + - invertclk : Should define offset for invertclk in retime register.
> + - retime : Should define offset for retime in retime register.
> + - clknotdata : Should define offset for clknotdata in retime register.
> + - double_edge : Should define offset for double edge in retime register.

As much as I like to describe the IP in the DT, I think it's too much this
time move this to C and use the compatible or detect it on the hardware to
handle this

> +- st,alt-control : Should be sysconf to control alternate function on pio.
> +- st,oe-control : Should be sysconf to control output enable on pio.
> +- st,pu-control : Should be sysconf to control pull up on pio.
> +- st,od-control : Should be sysconf to control open drain on pio.
> +- st,retime-style : Should indicate which type of retime is used.
> + possible values are "none", "packed" and "dedicated".
> +- st,retime-pin-mask : Should be mask to specify which pins can be retimed.
> +- retime-control[0...N]: These properties point to sysconfs which control retime.
> + Depending on retime-style the number of retime-controls
> + vary: 2 for "packed"; 8 for "dedicated".

> +- st,bank-name : Should be a name string for this bank.
> +
> +Example:
> + pio_retime_offset: pio-retime-offset {
> + clk1notclk0 = <0>;
> + delay-lsb = <2>;
> + delay-msb = <3>;
> + invertclk = <4>;
> + retime = <5>;
> + clknotdata = <6>;
> + double-edge = <7>;
> + };
> +
> + pin-controller {
> + #retime-delay-cells = <4>;
> + compatible = "st,stixxxx-pinctrl", "simple-bus";
> + st,retime-offset = <&pio_retime_offset>;
> + st,retime-in-delay = <0 500 1000 1500>;
> + st,retime-out-delay = <0 1000 2000 3000>;
> + ranges;
> + PIO0: pinctrl@fe610000 {
> + gpio-controller;
> + #gpio-cells = <1>;
> + compatible = "st,stixxxx-gpio";
> + reg = <0xfe610000 0x100>;
> + st,bank-name = "PIO0";
> + st,alt-control = <&SYSCONF_SBC(0) 0 31>;
> + st,oe-control = <&SYSCONF_SBC(5) 0 7>;
> + st,pu-control = <&SYSCONF_SBC(7) 0 7>;
> + st,od-control = <&SYSCONF_SBC(9) 0 7>;
> + st,retime-style = "packed";
> + st,retime-pin-mask = <0xff>;
> + st,retime-control0 = <&SYSCONF_SBC(16) 0 31>;
> + st,retime-control1 = <&SYSCONF_SBC(17) 0 31>;
> + };
> + ...
> + pin-functions nodes follow...
> + };
> +
> +
> +Contents of function subnode node:
> +----------------------
> +Required properties for pin configuration node:
> +- st,function : Should be alternate function number associated
> + with this set of pins.
> + possible altfunction values:
> + ALT1
> + ALT2
> + ALT3
> + ALT4
> + ALT5
> + ALT6
> + ALT7
use number in the DoC

> +
> +- st,pins : Child node with list of pins with configuration.
> +
> +Below is the format of how each pin conf should look like.
> +
> +<bank offset mode rt_type rt_delay rt_clk>
> +
> +Every PIO is represented with 4-7 parameters depending on retime configuration.
> +Each parameter is explained as below.
> +
> +-bank : Should be bank phandle to which this PIO belongs.
> +-offset : Offset in the PIO bank.
> +-mode :pin configuration is selected from one of the below values.
> + IN
> + IN_PU
> + OUT
> + BIDIR
> + BIDIR_PU
ditto
> +
> +-rt_type Retiming Configuration for the pin.
> + Possible retime configuration are:
> +
> + ------- -------------
> + value args
> + ------- -------------
> + NICLK <delay> <clk>
> + ICLK_IO <delay> <clk>
> + BYPASS <delay>
> + DE_IO <delay> <clk>
> + SE_ICLK_IO <delay> <clk>
> + SE_NICLK_IO <delay> <clk>
> +
> +- delay is retime delay in pico seconds.
> + Possible values are: refer to retime-in/out-delays
> +
> +- rt_clk :clk to be use for retime.
> + Possible values are:
> + CLK_A
> + CLK_B
> + CLK_C
> + CLK_D
> +
> +Example of mmcclk pin which is a bi-direction pull pu with retime config
> +as non inverted clock retimed with CLK_B and delay of 0 pico seconds:
> +
> +pin-controller {
> + ...
> + mmc0 {
> + pinctrl_mmc: mmc {
> + st,function = <ALT4>;
> + st,pins {
> + mmcclk = <&PIO13 4 BIDIR_PU NICLK 0 CLK_B>;
> + ...
> + };
> + };
> + ...
> + };
> +};
> +
> +sdhci0:sdhci@fe810000{
> + ...
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_mmc>;
> +};
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index 34f51d2..611a399 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -179,6 +179,19 @@ config PINCTRL_SUNXI
> select PINMUX
> select GENERIC_PINCONF
>
> +config PINCTRL_STIXXXX
> + bool "ST Microelectronics pin controller driver for STixxxx SoCs"
> + depends on PLAT_STIXXXX
> + select PINMUX
> + select PINCONF
> + select MFD_SYSCON
> + help
> + Say yes here to support pinctrl interface on STixxxx SOCs.
> + This driver is used to control both PIO block and PIO-mux
> + block to configure a pin.
> +
> + If unsure, say N.
> +
> config PINCTRL_TEGRA
> bool
> select PINMUX
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> index f82cc5b..99a2c78 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -47,6 +47,7 @@ obj-$(CONFIG_PINCTRL_EXYNOS) += pinctrl-exynos.o
> obj-$(CONFIG_PINCTRL_EXYNOS5440) += pinctrl-exynos5440.o
> obj-$(CONFIG_PINCTRL_XWAY) += pinctrl-xway.o
> obj-$(CONFIG_PINCTRL_LANTIQ) += pinctrl-lantiq.o
> +obj-$(CONFIG_PINCTRL_STIXXXX) += pinctrl-stixxxx.o
>
> obj-$(CONFIG_PLAT_ORION) += mvebu/
> obj-$(CONFIG_ARCH_SHMOBILE) += sh-pfc/
> diff --git a/drivers/pinctrl/pinctrl-stixxxx.c b/drivers/pinctrl/pinctrl-stixxxx.c
> new file mode 100644
> index 0000000..7d2c59c
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-stixxxx.c
> @@ -0,0 +1,1151 @@
> +/*
> + * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
> + * Authors:
> + * Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_address.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/platform_device.h>
> +#include "core.h"
> +#include "pinctrl-stixxxx.h"
> +
> +struct stixxxx_pinconf {
> + int pin;
> + const char *name;
> + unsigned long config;
> +};
> +
> +struct stixxxx_pmx_func {
> + const char *name;
> + const char **groups;
> + unsigned ngroups;
> +};
> +
> +struct stixxxx_pctl_group {
> + const char *name;
> + unsigned int *pins;
> + unsigned npins;
> + int altfunc;
> + struct stixxxx_pinconf *pin_conf;
> +};
> +
> +#define to_stixxxx_gpio_port(chip) \
> + container_of(chip, struct stixxxx_gpio_port, gpio_chip)
> +
> +struct stixxxx_gpio_port {
> + struct gpio_chip gpio_chip;
> + struct pinctrl_gpio_range range;
> + void __iomem *base;
> + struct device_node *of_node;
> + const char *bank_name;
> +};
> +
> +static struct stixxxx_gpio_port *gpio_ports[STIXXXX_MAX_GPIO_BANKS];
> +
> +struct stixxxx_pinctrl {
> + struct device *dev;
> + struct pinctrl_dev *pctl;
> + int nbanks;
> + struct stixxxx_pmx_func *functions;
> + int nfunctions;
> + struct stixxxx_pctl_group *groups;
> + int ngroups;
> + struct stixxxx_pio_control *pio_controls;
> +};
> +
> +/* Low level functions.. */
> +static void stixxxx_pinconf_set_direction(struct stixxxx_pio_control *pc,
> + int pin_id, unsigned long config)
> +{
> + struct syscon_field *output_enable;
> + struct syscon_field *pull_up;
> + struct syscon_field *open_drain;
> + unsigned long oe_value, pu_value, od_value;
> + unsigned long mask;
> + int pin = stixxxx_gpio_pin(pin_id);
> +
> + output_enable = pc->oe;
> + pull_up = pc->pu;
> + open_drain = pc->od;
> +
> + mask = BIT(pin);
> +
> + oe_value = syscon_read(output_enable);
> + pu_value = syscon_read(pull_up);
> + od_value = syscon_read(open_drain);
> +
> + /* Clear old values */
> + oe_value &= ~mask;
> + pu_value &= ~mask;
> + od_value &= ~mask;
> +
> + if (config & STIXXXX_PINCONF_OE)
> + oe_value |= mask;
> + if (config & STIXXXX_PINCONF_PU)
> + pu_value |= mask;
> + if (config & STIXXXX_PINCONF_OD)
> + od_value |= mask;
> +
> + syscon_write(output_enable, oe_value);
> + syscon_write(pull_up, pu_value);
> + syscon_write(open_drain, od_value);
> +}
> +
> +static void stixxxx_pctl_set_function(struct stixxxx_pio_control *pc,
> + int pin_id, int function)
> +{
> + struct syscon_field *selector;
> + int offset;
> + unsigned long val;
> + int pin = stixxxx_gpio_pin(pin_id);
> +
> + selector = pc->alt;
> + offset = pin * 4;
> + val = syscon_read(selector);
> + val &= ~(0xf << offset);
> + val |= function << offset;
> + syscon_write(selector, val);
> +}
> +
> +static unsigned long stixxxx_pinconf_delay_to_bit(unsigned int delay,
> + const struct stixxxx_retime_params *rt_params,
> + unsigned long config)
> +{
> + unsigned int *delay_times;
> + int num_delay_times, i, closest_index = -1;
> + unsigned int closest_divergence = UINT_MAX;
> +
> + if (STIXXXX_PINCONF_UNPACK_OE(config)) {
> + delay_times = rt_params->delay_times_out;
> + num_delay_times = rt_params->num_delay_times_out;
> + } else {
> + delay_times = rt_params->delay_times_in;
> + num_delay_times = rt_params->num_delay_times_in;
> + }
> +
> + for (i = 0; i < num_delay_times; i++) {
> + unsigned int divergence = abs(delay - delay_times[i]);
> +
> + if (divergence == 0)
> + return i;
> +
> + if (divergence < closest_divergence) {
> + closest_divergence = divergence;
> + closest_index = i;
> + }
> + }
> +
> + pr_warn("Attempt to set delay %d, closest available %d\n",
> + delay, delay_times[closest_index]);
> +
> + return closest_index;
> +}
> +
> +static unsigned long stixxxx_pinconf_bit_to_delay(unsigned int index,
> + const struct stixxxx_retime_params *rt_params,
> + unsigned long output)
> +{
> + unsigned int *delay_times;
> + int num_delay_times;
> +
> + if (output) {
> + delay_times = rt_params->delay_times_out;
> + num_delay_times = rt_params->num_delay_times_out;
> + } else {
> + delay_times = rt_params->delay_times_in;
> + num_delay_times = rt_params->num_delay_times_in;
> + }
> +
> + if (index < num_delay_times) {
> + return delay_times[index];
> + } else {
> + pr_warn("Delay not found in/out delay list\n");
> + return 0;
> + }
> +}
> +
> +static void stixxxx_pinconf_set_retime_packed(
> + struct stixxxx_pio_control *pc,
> + unsigned long config, int pin)
> +{
> + const struct stixxxx_retime_params *rt_params = pc->rt_params;
> + const struct stixxxx_retime_offset *offset = rt_params->retime_offset;
> + struct syscon_field **regs;
> + unsigned long values[2];
> + unsigned long mask;
> + int i, j;
> + int clk = STIXXXX_PINCONF_UNPACK_RT_CLK(config);
> + int clknotdata = STIXXXX_PINCONF_UNPACK_RT_CLKNOTDATA(config);
> + int double_edge = STIXXXX_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
> + int invertclk = STIXXXX_PINCONF_UNPACK_RT_INVERTCLK(config);
> + int retime = STIXXXX_PINCONF_UNPACK_RT(config);
> + unsigned long delay = stixxxx_pinconf_delay_to_bit(
> + STIXXXX_PINCONF_UNPACK_RT_DELAY(config),
> + pc->rt_params, config);
> +
> + unsigned long rt_cfg =
> + ((clk & 1) << offset->clk1notclk0_offset) |
> + ((clknotdata & 1) << offset->clknotdata_offset) |
> + ((delay & 1) << offset->delay_lsb_offset) |
> + (((delay >> 1) & 1) << offset->delay_msb_offset) |
> + ((double_edge & 1) << offset->double_edge_offset) |
> + ((invertclk & 1) << offset->invertclk_offset) |
> + ((retime & 1) << offset->retime_offset);
> +
> + regs = pc->retiming;
> + values[0] = syscon_read(regs[0]);
> + values[1] = syscon_read(regs[1]);
> +
> + for (i = 0; i < 2; i++) {
> + mask = BIT(pin);
> + for (j = 0; j < 4; j++) {
> + if (rt_cfg & 1)
> + values[i] |= mask;
> + else
> + values[i] &= ~mask;
> + mask <<= 8;
> + rt_cfg >>= 1;
> + }
> + }
> +
> + syscon_write(regs[0], values[0]);
> + syscon_write(regs[1], values[1]);
> +}
> +
> +static void stixxxx_pinconf_set_retime_dedicated(
> + struct stixxxx_pio_control *pc,
> + unsigned long config, int pin)
> +{
> + struct syscon_field *reg;
> + int input = STIXXXX_PINCONF_UNPACK_OE(config) ? 0 : 1;
> + int clk = STIXXXX_PINCONF_UNPACK_RT_CLK(config);
> + int clknotdata = STIXXXX_PINCONF_UNPACK_RT_CLKNOTDATA(config);
> + int double_edge = STIXXXX_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
> + int invertclk = STIXXXX_PINCONF_UNPACK_RT_INVERTCLK(config);
> + int retime = STIXXXX_PINCONF_UNPACK_RT(config);
> + unsigned long delay = stixxxx_pinconf_delay_to_bit(
> + STIXXXX_PINCONF_UNPACK_RT_DELAY(config),
> + pc->rt_params, config);
> +
> + unsigned long retime_config =
> + ((clk & 0x3) << 0) |
> + ((clknotdata & 0x1) << 2) |
> + ((delay & 0xf) << 3) |
> + ((input & 0x1) << 7) |
> + ((double_edge & 0x1) << 8) |
> + ((invertclk & 0x1) << 9) |
> + ((retime & 0x1) << 10);
> +
> + reg = pc->retiming[pin];
> + syscon_write(reg, retime_config);
> +}
> +
> +static void stixxxx_pinconf_get_direction(struct stixxxx_pio_control *pc,
> + int pin_id, unsigned long *config)
> +{
> + unsigned long oe_value, pu_value, od_value;
> + int pin = stixxxx_gpio_pin(pin_id);
> +
> + oe_value = (syscon_read(pc->oe) >> pin) & 1;
> + pu_value = (syscon_read(pc->pu) >> pin) & 1;
> + od_value = (syscon_read(pc->od) >> pin) & 1;
> +
> + STIXXXX_PINCONF_PACK_OE(*config, oe_value);
> + STIXXXX_PINCONF_PACK_PU(*config, pu_value);
> + STIXXXX_PINCONF_PACK_OD(*config, od_value);
> +}
> +
> +static int stixxxx_pinconf_get_retime_packed(
> + struct stixxxx_pio_control *pc,
> + int pin, unsigned long *config)
> +{
> + const struct stixxxx_retime_params *rt_params = pc->rt_params;
> + const struct stixxxx_retime_offset *offset = rt_params->retime_offset;
> + unsigned long delay_bits, delay, rt_reduced;
> + unsigned long rt_value[2];
> + int i, j;
> + int output = STIXXXX_PINCONF_UNPACK_OE(*config);
> +
> + rt_value[0] = syscon_read(pc->retiming[0]);
> + rt_value[1] = syscon_read(pc->retiming[1]);
> +
> + rt_reduced = 0;
> + for (i = 0; i < 2; i++) {
> + for (j = 0; j < 4; j++) {
> + if (rt_value[i] & (1<<((8*j)+pin)))
> + rt_reduced |= 1 << ((i*4)+j);
> + }
> + }
> +
> + STIXXXX_PINCONF_PACK_RT(*config,
> + (rt_reduced >> offset->retime_offset) & 1);
> + STIXXXX_PINCONF_PACK_RT_CLK(*config,
> + (rt_reduced >> offset->clk1notclk0_offset) & 1);
> + STIXXXX_PINCONF_PACK_RT_CLKNOTDATA(*config,
> + (rt_reduced >> offset->clknotdata_offset) & 1);
> + STIXXXX_PINCONF_PACK_RT_DOUBLE_EDGE(*config,
> + (rt_reduced >> offset->double_edge_offset) & 1);
> + STIXXXX_PINCONF_PACK_RT_INVERTCLK(*config,
> + (rt_reduced >> offset->invertclk_offset) & 1);
> +
> + delay_bits = (((rt_reduced >> offset->delay_msb_offset) & 1)<<1) |
> + ((rt_reduced >> offset->delay_lsb_offset) & 1);
> + delay = stixxxx_pinconf_bit_to_delay(delay_bits, rt_params, output);
> + STIXXXX_PINCONF_PACK_RT_DELAY(*config, delay);
> + return 0;
> +}
> +
> +static int stixxxx_pinconf_get_retime_dedicated(
> + struct stixxxx_pio_control *pc,
> + int pin, unsigned long *config)
> +{
> + unsigned long value;
> + unsigned long delay_bits, delay;
> + const struct stixxxx_retime_params *rt_params = pc->rt_params;
> + int output = STIXXXX_PINCONF_UNPACK_OE(*config);
> +
> + value = syscon_read(pc->retiming[pin]);
> + STIXXXX_PINCONF_PACK_RT_CLK(*config, ((value >> 0) & 0x3));
> + STIXXXX_PINCONF_PACK_RT_CLKNOTDATA(*config, ((value >> 2) & 0x1));
> + delay_bits = ((value >> 3) & 0xf);
> + delay = stixxxx_pinconf_bit_to_delay(delay_bits, rt_params, output);
> + STIXXXX_PINCONF_PACK_RT_DELAY(*config, delay);
> + STIXXXX_PINCONF_PACK_RT_DOUBLE_EDGE(*config, ((value >> 8) & 0x1));
> + STIXXXX_PINCONF_PACK_RT_INVERTCLK(*config, ((value >> 9) & 0x1));
> + STIXXXX_PINCONF_PACK_RT(*config, ((value >> 10) & 0x1));
> +
> + return 0;
> +}
> +
> +/* GPIO related functions */
> +
> +static inline void __stixxxx_gpio_set(struct stixxxx_gpio_port *port,
> + unsigned offset, int value)
> +{
> + if (value)
> + writel(BIT(offset), port->base + REG_PIO_SET_POUT);
> + else
> + writel(BIT(offset), port->base + REG_PIO_CLR_POUT);
> +}
> +
> +static void stixxxx_gpio_direction(unsigned int gpio, unsigned int direction)
> +{
> + int port_num = stixxxx_gpio_port(gpio);
> + int offset = stixxxx_gpio_pin(gpio);
> + struct stixxxx_gpio_port *port = gpio_ports[port_num];
> + int i = 0;
> +
> + for (i = 0; i <= 2; i++) {
> + if (direction & BIT(i))
> + writel(BIT(offset), port->base + REG_PIO_SET_PC(i));
> + else
> + writel(BIT(offset), port->base + REG_PIO_CLR_PC(i));
> + }
> +}
> +
> +static int stixxxx_gpio_request(struct gpio_chip *chip, unsigned offset)
> +{
> + return pinctrl_request_gpio(chip->base + offset);
> +}
> +
> +static void stixxxx_gpio_free(struct gpio_chip *chip, unsigned offset)
> +{
> + pinctrl_free_gpio(chip->base + offset);
> +}
> +
> +static int stixxxx_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> + struct stixxxx_gpio_port *port = to_stixxxx_gpio_port(chip);
> +
> + return (readl(port->base + REG_PIO_PIN) >> offset) & 1;
> +}
> +
> +static void stixxxx_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> +{
> + struct stixxxx_gpio_port *port = to_stixxxx_gpio_port(chip);
> + __stixxxx_gpio_set(port, offset, value);
> +}
> +
> +static int stixxxx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> +{
> + pinctrl_gpio_direction_input(chip->base + offset);
> + return 0;
> +}
> +
> +static int stixxxx_gpio_direction_output(struct gpio_chip *chip,
> + unsigned offset, int value)
> +{
> + struct stixxxx_gpio_port *port = to_stixxxx_gpio_port(chip);
> +
> + __stixxxx_gpio_set(port, offset, value);
> + pinctrl_gpio_direction_output(chip->base + offset);
> +
> + return 0;
> +}
> +
> +static int stixxxx_gpio_xlate(struct gpio_chip *gc,
> + const struct of_phandle_args *gpiospec, u32 *flags)
> +{
> + if (WARN_ON(gc->of_gpio_n_cells < 1))
> + return -EINVAL;
> +
> + if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
> + return -EINVAL;
> +
> + if (gpiospec->args[0] > gc->ngpio)
> + return -EINVAL;
> +
> + return gpiospec->args[0];
> +}
> +
> +/* Pinctrl Groups */
> +static int stixxxx_pctl_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->ngroups;
> +}
> +
> +static const char *stixxxx_pctl_get_group_name(struct pinctrl_dev *pctldev,
> + unsigned selector)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->groups[selector].name;
> +}
> +
> +static int stixxxx_pctl_get_group_pins(struct pinctrl_dev *pctldev,
> + unsigned selector, const unsigned **pins, unsigned *npins)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + if (selector >= info->ngroups)
> + return -EINVAL;
> +
> + *pins = info->groups[selector].pins;
> + *npins = info->groups[selector].npins;
> +
> + return 0;
> +}
> +
> +static const inline struct stixxxx_pctl_group *stixxxx_pctl_find_group_by_name(
> + const struct stixxxx_pinctrl *info, const char *name)
> +{
> + int i;
> +
> + for (i = 0; i < info->ngroups; i++) {
> + if (!strcmp(info->groups[i].name, name))
> + return &info->groups[i];
> + }
> +
> + return NULL;
> +}
> +
> +static int stixxxx_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
> + struct device_node *np, struct pinctrl_map **map, unsigned *num_maps)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + const struct stixxxx_pctl_group *grp;
> + struct pinctrl_map *new_map;
> + struct device_node *parent;
> + int map_num, i;
> +
> + grp = stixxxx_pctl_find_group_by_name(info, np->name);
> + if (!grp) {
> + dev_err(info->dev, "unable to find group for node %s\n",
> + np->name);
> + return -EINVAL;
> + }
> +
> + map_num = grp->npins + 1;
> + new_map = devm_kzalloc(pctldev->dev,
> + sizeof(*new_map) * map_num, GFP_KERNEL);
> + if (!new_map)
> + return -ENOMEM;
> +
> + parent = of_get_parent(np);
> + if (!parent) {
> + devm_kfree(pctldev->dev, new_map);
> + return -EINVAL;
> + }
> +
> + *map = new_map;
> + *num_maps = map_num;
> + new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
> + new_map[0].data.mux.function = parent->name;
> + new_map[0].data.mux.group = np->name;
> + of_node_put(parent);
> +
> + /* create config map per pin */
> + new_map++;
> + for (i = 0; i < grp->npins; i++) {
> + new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
> + new_map[i].data.configs.group_or_pin =
> + pin_get_name(pctldev, grp->pins[i]);
> + new_map[i].data.configs.configs = &grp->pin_conf[i].config;
> + new_map[i].data.configs.num_configs = 1;
> + }
> + dev_info(pctldev->dev, "maps: function %s group %s num %d\n",
> + (*map)->data.mux.function, grp->name, map_num);
> +
> + return 0;
> +}
> +
> +static void stixxxx_pctl_dt_free_map(struct pinctrl_dev *pctldev,
> + struct pinctrl_map *map, unsigned num_maps)
> +{
> +}
> +
> +static struct pinctrl_ops stixxxx_pctlops = {
> + .get_groups_count = stixxxx_pctl_get_groups_count,
> + .get_group_pins = stixxxx_pctl_get_group_pins,
> + .get_group_name = stixxxx_pctl_get_group_name,
> + .dt_node_to_map = stixxxx_pctl_dt_node_to_map,
> + .dt_free_map = stixxxx_pctl_dt_free_map,
> +};
> +
> +/* Pinmux */
> +static int stixxxx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->nfunctions;
> +}
> +
> +const char *stixxxx_pmx_get_fname(struct pinctrl_dev *pctldev,
> + unsigned selector)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->functions[selector].name;
> +}
> +
> +static int stixxxx_pmx_get_groups(struct pinctrl_dev *pctldev,
> + unsigned selector, const char * const **grps, unsigned * const ngrps)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + *grps = info->functions[selector].groups;
> + *ngrps = info->functions[selector].ngroups;
> +
> + return 0;
> +}
> +
> +static struct stixxxx_pio_control *stixxxx_get_pio_control(
> + struct stixxxx_pinctrl *info, int pin_id)
> +{
> + int port = stixxxx_gpio_port(pin_id);
> + return &info->pio_controls[port];
> +}
> +
> +static int stixxxx_pmx_enable(struct pinctrl_dev *pctldev, unsigned fselector,
> + unsigned group)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + struct stixxxx_pinconf *conf = info->groups[group].pin_conf;
> + struct stixxxx_pio_control *pc;
> + int i;
> +
> + for (i = 0; i < info->groups[group].npins; i++) {
> + pc = stixxxx_get_pio_control(info, conf[i].pin);
> + stixxxx_pctl_set_function(pc, conf[i].pin,
> + info->groups[group].altfunc);
> + }
> +
> + return 0;
> +}
> +
> +static void stixxxx_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
> + unsigned group)
> +{
> +}
> +
> +static int stixxxx_pmx_set_gpio_direction(struct pinctrl_dev *pctldev,
> + struct pinctrl_gpio_range *range, unsigned gpio,
> + bool input)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + struct stixxxx_pio_control *pc = &info->pio_controls[range->id];
> + /*
> + * When a PIO port is used in its primary function mode (altfunc = 0)
> + * Output Enable (OE), Open Drain(OD), and Pull Up (PU)
> + * for the primary PIO functions are driven by the related PIO block
> + */
> + stixxxx_pctl_set_function(pc, gpio, 0);
> + stixxxx_gpio_direction(gpio, input ?
> + STIXXXX_GPIO_DIRECTION_IN : STIXXXX_GPIO_DIRECTION_OUT);
> +
> + return 0;
> +}
> +
> +static struct pinmux_ops stixxxx_pmxops = {
> + .get_functions_count = stixxxx_pmx_get_funcs_count,
> + .get_function_name = stixxxx_pmx_get_fname,
> + .get_function_groups = stixxxx_pmx_get_groups,
> + .enable = stixxxx_pmx_enable,
> + .disable = stixxxx_pmx_disable,
> + .gpio_set_direction = stixxxx_pmx_set_gpio_direction,
> +};
> +
> +/* Pinconf */
> +static void stixxxx_pinconf_get_retime(struct stixxxx_pio_control *pc,
> + int pin_id, unsigned long *config)
> +{
> + int pin = stixxxx_gpio_pin(pin_id);
> + if (pc->rt_style == stixxxx_retime_style_packed)
> + stixxxx_pinconf_get_retime_packed(pc, pin, config);
> + else if (pc->rt_style == stixxxx_retime_style_dedicated)
> + if ((BIT(pin) & pc->rt_pin_mask))
> + stixxxx_pinconf_get_retime_dedicated(pc, pin, config);
> +}
> +
> +static void stixxxx_pinconf_set_retime(struct stixxxx_pio_control *pc,
> + int pin_id, unsigned long config)
> +{
> + int pin = stixxxx_gpio_pin(pin_id);
> +
> + if (pc->rt_style == stixxxx_retime_style_packed)
> + stixxxx_pinconf_set_retime_packed(pc, config, pin);
> + else if (pc->rt_style == stixxxx_retime_style_dedicated)
> + if ((BIT(pin) & pc->rt_pin_mask))
> + stixxxx_pinconf_set_retime_dedicated(pc, config, pin);
> +}
> +
> +static int stixxxx_pinconf_set(struct pinctrl_dev *pctldev,
> + unsigned pin_id, unsigned long config)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + struct stixxxx_pio_control *pc = stixxxx_get_pio_control(info, pin_id);
> +
> + stixxxx_pinconf_set_direction(pc, pin_id, config);
> + stixxxx_pinconf_set_retime(pc, pin_id, config);
> + return 0;
> +}
> +
> +static int stixxxx_pinconf_get(struct pinctrl_dev *pctldev,
> + unsigned pin_id, unsigned long *config)
> +{
> + struct stixxxx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + struct stixxxx_pio_control *pc = stixxxx_get_pio_control(info, pin_id);
> +
> + *config = 0;
> + stixxxx_pinconf_get_direction(pc, pin_id, config);
> + stixxxx_pinconf_get_retime(pc, pin_id, config);
> +
> + return 0;
> +}
> +
> +static void stixxxx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
> + struct seq_file *s, unsigned pin_id)
> +{
> + unsigned long config;
> + stixxxx_pinconf_get(pctldev, pin_id, &config);
> +
> + seq_printf(s, "[OE:%ld,PU:%ld,OD:%ld]\n"
> + "\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
> + "de:%ld,rt-clk:%ld,rt-delay:%ld]",
> + STIXXXX_PINCONF_UNPACK_OE(config),
> + STIXXXX_PINCONF_UNPACK_PU(config),
> + STIXXXX_PINCONF_UNPACK_OD(config),
> + STIXXXX_PINCONF_UNPACK_RT(config),
> + STIXXXX_PINCONF_UNPACK_RT_INVERTCLK(config),
> + STIXXXX_PINCONF_UNPACK_RT_CLKNOTDATA(config),
> + STIXXXX_PINCONF_UNPACK_RT_DOUBLE_EDGE(config),
> + STIXXXX_PINCONF_UNPACK_RT_CLK(config),
> + STIXXXX_PINCONF_UNPACK_RT_DELAY(config));
> +}
> +
> +static struct pinconf_ops stixxxx_confops = {
> + .pin_config_get = stixxxx_pinconf_get,
> + .pin_config_set = stixxxx_pinconf_set,
> + .pin_config_dbg_show = stixxxx_pinconf_dbg_show,
> +};
> +
> +/* pinctrl */
> +static struct pinctrl_desc stixxxx_pctl_desc = {
> + .owner = THIS_MODULE,
> + .pctlops = &stixxxx_pctlops,
> + .pmxops = &stixxxx_pmxops,
> + .confops = &stixxxx_confops,
> +};
> +
> +static int stixxxx_pinconf_dt_parse_rt_params(struct stixxxx_pinctrl *info,
> + struct device_node *np, struct stixxxx_retime_params *params)
> +{
> + const __be32 *ip;
> + struct device_node *offset_np;
> + struct stixxxx_retime_offset *rt_offset;
> + int delay_count = 0;
> +
> + ip = of_get_property(np, "#retime-delay-cells", NULL);
> + if (ip)
> + delay_count = be32_to_cpup(ip);
> + else
> + pr_warn("No #retime-delay-cells specified\n");
> +
> + params->num_delay_times_out = delay_count;
> + params->num_delay_times_in = delay_count;
> + params->delay_times_in = devm_kzalloc(info->dev,
> + sizeof(u32) * delay_count, GFP_KERNEL);
> + params->delay_times_out = devm_kzalloc(info->dev,
> + sizeof(u32) * delay_count, GFP_KERNEL);
> +
> + if (!params->delay_times_in || !params->delay_times_out)
> + return -ENOMEM;
> +
> + of_property_read_u32_array(np, "st,retime-in-delay",
> + (u32 *)params->delay_times_in, delay_count);
> + of_property_read_u32_array(np, "st,retime-out-delay",
> + (u32 *)params->delay_times_out, delay_count);
> +
> + offset_np = of_parse_phandle(np, "st,retime-offset", 0);
> +
> + if (offset_np) {
> + rt_offset = devm_kzalloc(info->dev,
> + sizeof(*rt_offset), GFP_KERNEL);
> + if (!rt_offset)
> + return -ENOMEM;
> +
> + params->retime_offset = rt_offset;
> + WARN_ON(of_property_read_u32(offset_np, "retime",
> + &rt_offset->retime_offset));
> + WARN_ON(of_property_read_u32(offset_np, "clk1notclk0",
> + &rt_offset->clk1notclk0_offset));
> + WARN_ON(of_property_read_u32(offset_np, "clknotdata",
> + &rt_offset->clknotdata_offset));
> + WARN_ON(of_property_read_u32(offset_np, "double-edge",
> + &rt_offset->double_edge_offset));
> + WARN_ON(of_property_read_u32(offset_np, "invertclk",
> + &rt_offset->invertclk_offset));
> + WARN_ON(of_property_read_u32(offset_np, "delay-lsb",
> + &rt_offset->delay_lsb_offset));
> + WARN_ON(of_property_read_u32(offset_np, "delay-msb",
> + &rt_offset->delay_msb_offset));
> + }
> +
> + return 0;
> +}
> +
> +static const char *gpio_compat = "st,stixxxx-gpio";
> +
> +static void stixxxx_pctl_dt_child_count(struct stixxxx_pinctrl *info,
> + struct device_node *np)
> +{
> + struct device_node *child;
> + for_each_child_of_node(np, child) {
> + if (of_device_is_compatible(child, gpio_compat)) {
> + info->nbanks++;
> + } else {
> + info->nfunctions++;
> + info->ngroups += of_get_child_count(child);
> + }
> + }
> +}
> +
> +static int stixxxx_pctl_dt_get_retime_conf(struct device_node *np,
> + struct stixxxx_pio_control *pc)
> +{
> + const char *style;
> + char name[20];
> + unsigned int j;
> + of_property_read_string(np, "st,retime-style", &style);
> +
> + if (strcmp(style, "packed") == 0) {
> + pc->rt_style = stixxxx_retime_style_packed;
> + for (j = 0; j < 2; j++) {
> + snprintf(name, sizeof(name), "st,retime-control%d", j);
> + pc->retiming[j] = syscon_claim(np, name);
> + if (!pc->retiming[j])
> + return -ENODATA;
> + }
> + } else if (strcmp(style, "dedicated") == 0) {
> + pc->rt_style = stixxxx_retime_style_dedicated;
> + for (j = 0; j < 8; j++) {
> + if ((1<<j) & pc->rt_pin_mask) {
> + snprintf(name, sizeof(name),
> + "st,retime-control%d", j);
> + pc->retiming[j] = syscon_claim(np, name);
> + if (!pc->retiming[j])
> + return -ENODATA;
> + }
> + }
> + } else if (strcmp(style, "none") == 0) {
> + pc->rt_style = stixxxx_retime_style_none;
> + }
> +
> + return 0;
> +}
> +
> +static int stixxxx_pctl_dt_init(struct stixxxx_pinctrl *info,
> + struct device_node *np)
> +{
> + struct stixxxx_pio_control *pc;
> + struct stixxxx_retime_params *rt_params;
> + struct device *dev = info->dev;
> + unsigned int i = 0;
> + struct device_node *child = NULL;
> +
> + pc = devm_kzalloc(dev, sizeof(*pc) * info->nbanks, GFP_KERNEL);
> + rt_params = devm_kzalloc(dev, sizeof(*rt_params), GFP_KERNEL);
> +
> + if (!pc || !rt_params)
> + return -ENOMEM;
> +
> + info->pio_controls = pc;
> + if (stixxxx_pinconf_dt_parse_rt_params(info, np, rt_params))
> + return -ENOMEM;
> +
> + for_each_child_of_node(np, child) {
> + if (of_device_is_compatible(child, gpio_compat)) {
> + pc[i].rt_params = rt_params;
> +
> + pc[i].alt = syscon_claim(child, "st,alt-control");
> + if (!pc[i].alt)
> + goto failed;
> +
> + pc[i].oe = syscon_claim(child, "st,oe-control");
> + if (!pc[i].oe)
> + goto failed;
> +
> + pc[i].pu = syscon_claim(child, "st,pu-control");
> + if (!pc[i].pu)
> + goto failed;
> +
> + pc[i].od = syscon_claim(child, "st,od-control");
> + if (!pc[i].od)
> + goto failed;
> +
> + of_property_read_u32(child, "st,retime-pin-mask",
> + &pc[i].rt_pin_mask);
> +
> + stixxxx_pctl_dt_get_retime_conf(child, &pc[i]);
> + i++;
> + }
> + }
> +
> + return 0;
> +failed:
> + return -ENODATA;
> +}
> +
> +#define OF_GPIO_ARGS_MIN (3)
> +/*
> + * Each pin is represented in of the below forms.
> + * <bank offset direction func rt_type rt_delay rt_clk>
> + */
> +static int stixxxx_pctl_dt_parse_groups(struct device_node *np,
> + struct stixxxx_pctl_group *grp, struct stixxxx_pinctrl *info, int idx)
> +{
> + /* bank pad direction val altfunction */
> + const __be32 *list;
> + struct property *pp;
> + struct stixxxx_pinconf *conf;
> + phandle phandle;
> + struct device_node *pins;
> + u32 pin;
> + int i = 0, npins = 0, nr_props;
> +
> + pins = of_get_child_by_name(np, "st,pins");
> + if (!pins)
> + return -ENODATA;
> +
> + for_each_property_of_node(pins, pp) {
> + /* Skip those we do not want to proceed */
> + if (!strcmp(pp->name, "name"))
> + continue;
> +
> + if (pp && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) {
> + npins++;
> + } else {
> + pr_warn("Invalid st,pins in %s node\n", np->name);
> + return -EINVAL;
> + }
> + }
> +
> + grp->npins = npins;
> + grp->name = np->name;
> + grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL);
> + grp->pin_conf = devm_kzalloc(info->dev,
> + npins * sizeof(*conf), GFP_KERNEL);
> + of_property_read_u32(np, "st,function", &grp->altfunc);
> +
> + if (!grp->pins || !grp->pin_conf)
> + return -ENOMEM;
> +
> + /* <bank offset direction func rt_type rt_delay rt_clk> */
> + for_each_property_of_node(pins, pp) {
> + if (!strcmp(pp->name, "name"))
> + continue;
> + nr_props = pp->length/sizeof(u32);
> + list = pp->value;
> + conf = &grp->pin_conf[i];
> +
> + /* bank & offset */
> + phandle = be32_to_cpup(list++);
> + pin = be32_to_cpup(list++);
> + conf->pin = of_get_named_gpio(pins, pp->name, 0);
> + conf->name = pp->name;
> + grp->pins[i] = conf->pin;
> +
> + conf->config = 0;
> + /* direction */
> + conf->config |= be32_to_cpup(list++);
> + /* rt_type rt_delay rt_clk */
> + if (nr_props >= OF_GPIO_ARGS_MIN + 2) {
> + /* rt_type */
> + conf->config |= be32_to_cpup(list++);
> + /* rt_delay */
> + conf->config |= be32_to_cpup(list++);
> + /* rt_clk */
> + if (nr_props > OF_GPIO_ARGS_MIN + 2)
> + conf->config |= be32_to_cpup(list++);
> + }
> + i++;
> + }
> + of_node_put(pins);
> +
> + return 0;
> +}
> +
> +static int stixxxx_pctl_parse_functions(struct device_node *np,
> + struct stixxxx_pinctrl *info, u32 index, int *grp_index)
> +{
> + struct device_node *child;
> + struct stixxxx_pmx_func *func;
> + struct stixxxx_pctl_group *grp;
> + int ret, i;
> +
> + func = &info->functions[index];
> + func->name = np->name;
> + func->ngroups = of_get_child_count(np);
> + if (func->ngroups <= 0) {
> + dev_err(info->dev, "No groups defined\n");
> + return -EINVAL;
> + }
> + func->groups = devm_kzalloc(info->dev,
> + func->ngroups * sizeof(char *), GFP_KERNEL);
> + if (!func->groups)
> + return -ENOMEM;
> +
> + i = 0;
> + for_each_child_of_node(np, child) {
> + func->groups[i] = child->name;
> + grp = &info->groups[*grp_index];
> + *grp_index += 1;
> + ret = stixxxx_pctl_dt_parse_groups(child, grp, info, i++);
> + if (ret)
> + return ret;
> + }
> + dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
> + index, func->name, func->ngroups);
> +
> + return 0;
> +}
> +
> +static int stixxxx_pctl_probe_dt(struct platform_device *pdev,
> + struct stixxxx_pinctrl *info)
> +{
> + int ret = 0;
> + int i = 0, j = 0, k = 0;
> + struct pinctrl_pin_desc *pdesc;
> + struct device_node *np = pdev->dev.of_node;
> + struct device_node *child;
> + int grp_index = 0;
> +
> + stixxxx_pctl_dt_child_count(info, np);
> + if (info->nbanks < 1) {
> + dev_err(&pdev->dev, "you need atleast one gpio bank\n");
> + return -EINVAL;
> + }
> +
> + ret = stixxxx_pctl_dt_init(info, np);
> + if (ret)
> + return ret;
> +
> + dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks);
> + dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
> + dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups);
> + info->functions = devm_kzalloc(&pdev->dev,
> + info->nfunctions * sizeof(*info->functions), GFP_KERNEL);
> +
> + info->groups = devm_kzalloc(&pdev->dev,
> + info->ngroups * sizeof(*info->groups) , GFP_KERNEL);
> +
> + if (!info->functions || !info->groups)
> + return -ENOMEM;
> +
> + stixxxx_pctl_desc.npins = info->nbanks * STIXXXX_GPIO_PINS_PER_PORT;
> + pdesc = devm_kzalloc(&pdev->dev,
> + sizeof(*pdesc) * stixxxx_pctl_desc.npins, GFP_KERNEL);
> + if (!pdesc)
> + return -ENOMEM;
> +
> + stixxxx_pctl_desc.pins = pdesc;
> +
> + for_each_child_of_node(np, child) {
> + if (of_device_is_compatible(child, gpio_compat)) {
> + for (j = 0; j < STIXXXX_GPIO_PINS_PER_PORT; j++, k++) {
> + const char *port_name = NULL;
> + pdesc->number = k;
> + of_property_read_string(child, "st,bank-name",
> + &port_name);
> + pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]",
> + port_name ? : "PIO",
> + port_name ? j : k);
> + pdesc++;
> + }
> + } else {
> + ret = stixxxx_pctl_parse_functions(child, info,
> + i++, &grp_index);
> + if (ret) {
> + dev_err(&pdev->dev, "No functions found.\n");
> + return ret;
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int stixxxx_pctl_probe(struct platform_device *pdev)
> +{
> + struct stixxxx_pinctrl *info;
> + int ret, i;
> +
> + if (!pdev->dev.of_node) {
> + dev_err(&pdev->dev, "device node not found.\n");
> + return -EINVAL;
> + }
> +
> + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->dev = &pdev->dev;
> + platform_set_drvdata(pdev, info);
> + ret = stixxxx_pctl_probe_dt(pdev, info);
> + if (ret)
> + return ret;
> +
> + stixxxx_pctl_desc.name = dev_name(&pdev->dev);
> + info->pctl = pinctrl_register(&stixxxx_pctl_desc, &pdev->dev, info);
> + if (IS_ERR(info->pctl)) {
> + dev_err(&pdev->dev, "Failed pinctrl registration\n");
> + return PTR_ERR(info->pctl);
> + }
> +
> + for (i = 0; i < info->nbanks; i++)
> + pinctrl_add_gpio_range(info->pctl, &gpio_ports[i]->range);
> +
> + return 0;
> +}
> +
> +static struct gpio_chip stixxxx_gpio_template = {
> + .request = stixxxx_gpio_request,
> + .free = stixxxx_gpio_free,
> + .get = stixxxx_gpio_get,
> + .set = stixxxx_gpio_set,
> + .direction_input = stixxxx_gpio_direction_input,
> + .direction_output = stixxxx_gpio_direction_output,
> + .ngpio = STIXXXX_GPIO_PINS_PER_PORT,
> + .of_gpio_n_cells = 1,
> + .of_xlate = stixxxx_gpio_xlate,
> +};
> +
> +static int stixxxx_gpio_probe(struct platform_device *pdev)
> +{
> + struct stixxxx_gpio_port *port;
> + struct pinctrl_gpio_range *range;
> + struct device_node *np = pdev->dev.of_node;
> + int port_num = of_alias_get_id(np, "gpio");
> + struct resource *res;
> + int err;
> +
> + port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
> + if (!port)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + port->base = devm_request_and_ioremap(&pdev->dev, res);
> + if (!port->base) {
> + dev_err(&pdev->dev, "Can't get IO memory mapping!\n");
> + return -ENODEV;
> + }
> +
> + of_property_read_string(np, "st,bank-name", &port->bank_name);
> + port->of_node = np;
> +
> + port->gpio_chip = stixxxx_gpio_template;
> + port->gpio_chip.base = port_num * STIXXXX_GPIO_PINS_PER_PORT;
> + port->gpio_chip.ngpio = STIXXXX_GPIO_PINS_PER_PORT;
> + port->gpio_chip.of_node = np;
> + port->gpio_chip.label = dev_name(&pdev->dev);
> +
> + dev_set_drvdata(&pdev->dev, port);
> + range = &port->range;
> + range->name = port->gpio_chip.label;
> + range->id = port_num;
> + range->pin_base = range->base = range->id * STIXXXX_GPIO_PINS_PER_PORT;
> + range->npins = port->gpio_chip.ngpio;
> + range->gc = &port->gpio_chip;
> + gpio_ports[port_num] = port;
> + err = gpiochip_add(&port->gpio_chip);
> + if (err) {
> + dev_err(&pdev->dev, "Failed to add gpiochip(%d)!\n", port_num);
> + return err;
> + }
> + dev_info(&pdev->dev, "gpioport[%s] Added as bank%d\n",
> + port->bank_name, port_num);
> + return 0;
> +}
> +
> +static struct of_device_id stixxxx_gpio_of_match[] = {
> + { .compatible = "st,stixxxx-gpio", },
> + { /* sentinel */ }
> +};
> +
> +static struct platform_driver stixxxx_gpio_driver = {
> + .driver = {
> + .name = "st-gpio",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(stixxxx_gpio_of_match),
> + },
> + .probe = stixxxx_gpio_probe,
> +};
> +
> +static struct of_device_id stixxxx_pctl_of_match[] = {
> + { .compatible = "st,stixxxx-pinctrl",},
> + { /* sentinel */ }
> +};
> +
> +static struct platform_driver stixxxx_pctl_driver = {
> + .driver = {
> + .name = "st-pinctrl",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(stixxxx_pctl_of_match),
> + },
> + .probe = stixxxx_pctl_probe,
> +};
> +
> +static int __init stixxxx_pctl_init(void)
> +{
> + int ret = platform_driver_register(&stixxxx_gpio_driver);
> + if (ret)
> + return ret;
> + return platform_driver_register(&stixxxx_pctl_driver);
> +}
> +arch_initcall(stixxxx_pctl_init);
> diff --git a/drivers/pinctrl/pinctrl-stixxxx.h b/drivers/pinctrl/pinctrl-stixxxx.h
> new file mode 100644
> index 0000000..a340964
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-stixxxx.h
> @@ -0,0 +1,197 @@
> +
> +/*
> + * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
> + * Authors:
> + * Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __LINUX_DRIVERS_PINCTRL_STIXXXX_H
> +#define __LINUX_DRIVERS_PINCTRL_STIXXXX_H
> +
> +enum stixxxx_retime_style {
> + stixxxx_retime_style_none,
> + stixxxx_retime_style_packed,
> + stixxxx_retime_style_dedicated,
> +};
> +
> +/* Byte positions in 2 syscon words, starts from 0 */
> +struct stixxxx_retime_offset {
> + int retime_offset;
> + int clk1notclk0_offset;
> + int clknotdata_offset;
> + int double_edge_offset;
> + int invertclk_offset;
> + int delay_lsb_offset;
> + int delay_msb_offset;
> +};
> +
> +struct stixxxx_retime_params {
> + const struct stixxxx_retime_offset *retime_offset;
> + unsigned int *delay_times_in;
> + int num_delay_times_in;
> + unsigned int *delay_times_out;
> + int num_delay_times_out;
> +};
> +
> +struct stixxxx_pio_control {
> + enum stixxxx_retime_style rt_style;
> + u32 rt_pin_mask;
> + const struct stixxxx_retime_params *rt_params;
> + struct syscon_field *alt;
> + struct syscon_field *oe, *pu, *od;
> + struct syscon_field *retiming[8];
> +};
> +
> +/* PIO Block registers */
> +/* PIO output */
> +#define REG_PIO_POUT 0x00
> +/* Set bits of POUT */
> +#define REG_PIO_SET_POUT 0x04
> +/* Clear bits of POUT */
> +#define REG_PIO_CLR_POUT 0x08
> +/* PIO input */
> +#define REG_PIO_PIN 0x10
> +/* PIO configuration */
> +#define REG_PIO_PC(n) (0x20 + (n) * 0x10)
> +/* Set bits of PC[2:0] */
> +#define REG_PIO_SET_PC(n) (0x24 + (n) * 0x10)
> +/* Clear bits of PC[2:0] */
> +#define REG_PIO_CLR_PC(n) (0x28 + (n) * 0x10)
> +/* PIO input comparison */
> +#define REG_PIO_PCOMP 0x50
> +/* Set bits of PCOMP */
> +#define REG_PIO_SET_PCOMP 0x54
> +/* Clear bits of PCOMP */
> +#define REG_PIO_CLR_PCOMP 0x58
> +/* PIO input comparison mask */
> +#define REG_PIO_PMASK 0x60
> +/* Set bits of PMASK */
> +#define REG_PIO_SET_PMASK 0x64
> +/* Clear bits of PMASK */
> +#define REG_PIO_CLR_PMASK 0x68
> +
> +#define STIXXXX_MAX_GPIO_BANKS 32
> +
> +#define STIXXXX_GPIO_DIRECTION_BIDIR 0x1
> +#define STIXXXX_GPIO_DIRECTION_OUT 0x2
> +#define STIXXXX_GPIO_DIRECTION_IN 0x4
> +
> +#define STIXXXX_GPIO_PINS_PER_PORT 8
> +#define stixxxx_gpio_port(gpio) ((gpio) / STIXXXX_GPIO_PINS_PER_PORT)
> +#define stixxxx_gpio_pin(gpio) ((gpio) % STIXXXX_GPIO_PINS_PER_PORT)
> +
> +/* pinconf */
> +/*
> + * Pinconf is represented in an opaque unsigned long variable.
> + * Below is the bit allocation details for each possible configuration.
> + * All the bit fields can be encapsulated into four variables
> + * (direction, retime-type, retime-clk, retime-delay)
> + *
> + * +----------------+
> + *[31:28]| reserved-3 |
> + * +----------------+-------------
> + *[27] | oe | |
> + * +----------------+ v
> + *[26] | pu | [Direction ]
> + * +----------------+ ^
> + *[25] | od | |
> + * +----------------+-------------
> + *[24] | reserved-2 |
> + * +----------------+-------------
> + *[23] | retime | |
> + * +----------------+ |
> + *[22] | retime-invclk | |
> + * +----------------+ v
> + *[21] |retime-clknotdat| [Retime-type ]
> + * +----------------+ ^
> + *[20] | retime-de | |
> + * +----------------+-------------
> + *[19:18]| retime-clk |------>[Retime-Clk ]
> + * +----------------+
> + *[17:16]| reserved-1 |
> + * +----------------+
> + *[15..0]| retime-delay |------>[Retime Delay]
> + * +----------------+
> + */
> +
> +#define STIXXXX_PINCONF_UNPACK(conf, param)\
> + ((conf >> STIXXXX_PINCONF_ ##param ##_SHIFT) \
> + & STIXXXX_PINCONF_ ##param ##_MASK)
> +
> +#define STIXXXX_PINCONF_PACK(conf, val, param) (conf |=\
> + ((val & STIXXXX_PINCONF_ ##param ##_MASK) << \
> + STIXXXX_PINCONF_ ##param ##_SHIFT))
> +
> +/* Output enable */
> +#define STIXXXX_PINCONF_OE_MASK 0x1
> +#define STIXXXX_PINCONF_OE_SHIFT 27
> +#define STIXXXX_PINCONF_OE BIT(27)
> +#define STIXXXX_PINCONF_UNPACK_OE(conf) STIXXXX_PINCONF_UNPACK(conf, OE)
> +#define STIXXXX_PINCONF_PACK_OE(conf, val) STIXXXX_PINCONF_PACK(conf, val, OE)
> +
> +/* Pull Up */
> +#define STIXXXX_PINCONF_PU_MASK 0x1
> +#define STIXXXX_PINCONF_PU_SHIFT 26
> +#define STIXXXX_PINCONF_PU BIT(26)
> +#define STIXXXX_PINCONF_UNPACK_PU(conf) STIXXXX_PINCONF_UNPACK(conf, PU)
> +#define STIXXXX_PINCONF_PACK_PU(conf, val) STIXXXX_PINCONF_PACK(conf, val, PU)
> +
> +/* Open Drain */
> +#define STIXXXX_PINCONF_OD_MASK 0x1
> +#define STIXXXX_PINCONF_OD_SHIFT 25
> +#define STIXXXX_PINCONF_OD BIT(25)
> +#define STIXXXX_PINCONF_UNPACK_OD(conf) STIXXXX_PINCONF_UNPACK(conf, OD)
> +#define STIXXXX_PINCONF_PACK_OD(conf, val) STIXXXX_PINCONF_PACK(conf, val, OD)
> +
> +#define STIXXXX_PINCONF_RT_MASK 0x1
> +#define STIXXXX_PINCONF_RT_SHIFT 23
> +#define STIXXXX_PINCONF_RT BIT(23)
> +#define STIXXXX_PINCONF_UNPACK_RT(conf) STIXXXX_PINCONF_UNPACK(conf, RT)
> +#define STIXXXX_PINCONF_PACK_RT(conf, val) STIXXXX_PINCONF_PACK(conf, val, RT)
> +
> +#define STIXXXX_PINCONF_RT_INVERTCLK_MASK 0x1
> +#define STIXXXX_PINCONF_RT_INVERTCLK_SHIFT 22
> +#define STIXXXX_PINCONF_RT_INVERTCLK BIT(22)
> +#define STIXXXX_PINCONF_UNPACK_RT_INVERTCLK(conf) \
> + STIXXXX_PINCONF_UNPACK(conf, RT_INVERTCLK)
> +#define STIXXXX_PINCONF_PACK_RT_INVERTCLK(conf, val) \
> + STIXXXX_PINCONF_PACK(conf, val, RT_INVERTCLK)
> +
> +#define STIXXXX_PINCONF_RT_CLKNOTDATA_MASK 0x1
> +#define STIXXXX_PINCONF_RT_CLKNOTDATA_SHIFT 21
> +#define STIXXXX_PINCONF_RT_CLKNOTDATA BIT(21)
> +#define STIXXXX_PINCONF_UNPACK_RT_CLKNOTDATA(conf) \
> + STIXXXX_PINCONF_UNPACK(conf, RT_CLKNOTDATA)
> +#define STIXXXX_PINCONF_PACK_RT_CLKNOTDATA(conf, val) \
> + STIXXXX_PINCONF_PACK(conf, val, RT_CLKNOTDATA)
> +
> +#define STIXXXX_PINCONF_RT_DOUBLE_EDGE_MASK 0x1
> +#define STIXXXX_PINCONF_RT_DOUBLE_EDGE_SHIFT 20
> +#define STIXXXX_PINCONF_RT_DOUBLE_EDGE BIT(20)
> +#define STIXXXX_PINCONF_UNPACK_RT_DOUBLE_EDGE(conf) \
> + STIXXXX_PINCONF_UNPACK(conf, RT_DOUBLE_EDGE)
> +#define STIXXXX_PINCONF_PACK_RT_DOUBLE_EDGE(conf, val) \
> + STIXXXX_PINCONF_PACK(conf, val, RT_DOUBLE_EDGE)
> +
> +#define STIXXXX_PINCONF_RT_CLK_MASK 0x3
> +#define STIXXXX_PINCONF_RT_CLK_SHIFT 18
> +#define STIXXXX_PINCONF_RT_CLK BIT(18)
> +#define STIXXXX_PINCONF_UNPACK_RT_CLK(conf) \
> + STIXXXX_PINCONF_UNPACK(conf, RT_CLK)
> +#define STIXXXX_PINCONF_PACK_RT_CLK(conf, val) \
> + STIXXXX_PINCONF_PACK(conf, val, RT_CLK)
> +
> +/* RETIME_DELAY in Pico Secs */
> +#define STIXXXX_PINCONF_RT_DELAY_MASK 0xffff
> +#define STIXXXX_PINCONF_RT_DELAY_SHIFT 0
> +#define STIXXXX_PINCONF_UNPACK_RT_DELAY(conf) \
> + STIXXXX_PINCONF_UNPACK(conf, RT_DELAY)
> +#define STIXXXX_PINCONF_PACK_RT_DELAY(conf, val) \
> + STIXXXX_PINCONF_PACK(conf, val, RT_DELAY)
> +
> +#endif /* __LINUX_DRIVERS_PINCTRL_STIXXXX_H */
> --
> 1.7.6.5
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@xxxxxxxxxxxxxxxx
> https://lists.ozlabs.org/listinfo/devicetree-discuss
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