Re: [PATCH v4 1/3] dt-bindings: pinctrl: renesas,rzn1-pinctrl: documentation

From: jacopo mondi
Date: Fri Sep 21 2018 - 08:37:01 EST

Hi Phil,

On Wed, Sep 19, 2018 at 03:23:44PM +0100, Phil Edworthy wrote:
> The Renesas RZ/N1 device family PINCTRL node description.
>
> Based on a patch originally written by Michel Pollet at Renesas.
>
> Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> ---
> v4:
> - Add alternative way to use the pinmux prop.
> - Remove mention of gpios.
>
> v3:
> - Use standard bindings
> - Change the way the functions are defined so it is easy to check
> against the hardware numbering.
> - Add functions for the MDIO source peripheral instead of using
> virtual pins.
>
> v2:
> - Change filename to generic rzn1, instead of device specific.
> - Add "renesas,rzn1-pinctrl" compatible fallback string.
> - Example register size corrected.
> - Typos fixed.
> - Changes suggested by Jacopo Mondi.
> - rzn1-pinctrl.h squashed into this as requested by Rob Herring.
> ---
> .../bindings/pinctrl/renesas,rzn1-pinctrl.txt | 153 ++++++++++++++++++
> include/dt-bindings/pinctrl/rzn1-pinctrl.h | 141 ++++++++++++++++
> 2 files changed, 294 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> create mode 100644 include/dt-bindings/pinctrl/rzn1-pinctrl.h
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> new file mode 100644
> index 000000000000..323ef5c6c1c9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
> @@ -0,0 +1,153 @@
> +Renesas RZ/N1 SoC Pinctrl node description.
> +
> +Pin controller node
> +-------------------
> +Required properties:
> +- compatible: SoC-specific compatible string "renesas,<soc-specific>-pinctrl"
> + followed by "renesas,rzn1-pinctrl" as fallback. The SoC-specific compatible
> + strings must be one of:
> + "renesas,r9a06g032-pinctrl" for RZ/N1D
> + "renesas,r9a06g033-pinctrl" for RZ/N1S
> +- reg: Address base and length of the memory area where the pin controller
> + hardware is mapped to.
> +- clocks: phandle for the clock, see the description of clock-names below.
> +- clock-names: Contains the name of the clock:
> + "bus", the bus clock, sometimes described as pclk, for register accesses.
> +
> +Example:
> + pinctrl: pin-controller@40067000 {
> + compatible = "renesas,r9a06g032-pinctrl", "renesas,rzn1-pinctrl";
> + reg = <0x40067000 0x1000>, <0x51000000 0x480>;
> + clocks = <&sysctrl R9A06G032_HCLK_PINCONFIG>;
> + clock-names = "bus";
> + };
> +
> +Sub-nodes
> +---------
> +
> +The child nodes of the pin controller node describe a pin multiplexing
> +function.
> +
> +- Pin multiplexing sub-nodes:
> + A pin multiplexing sub-node describes how to configure a set of
> + (or a single) pin in some desired alternate function mode.
> + A single sub-node may define several pin configurations.
> + Please refer to pinctrl-bindings.txt to get to know more on generic
> + pin properties usage.
> +
> + The allowed generic formats for a pin multiplexing sub-node are the
> + following ones:
> +
> + node-1 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> +
> + node-2 {
> + sub-node-1 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> +
> + sub-node-2 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> +
> + ...
> +
> + sub-node-n {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> + };
> +
> + node-3 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> +
> + sub-node-1 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> +
> + ...
> +
> + sub-node-n {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;
> + };
> + };

I can't think a use case for this format, but it doesn't hurt I guess

> +
> + Use the latter two formats when pins part of the same logical group need to
> + have different generic pin configuration flags applied. Note that the generic
> + pinconfig in node-3 does not apply to the sub-nodes.
> +
> + Client sub-nodes shall refer to pin multiplexing sub-nodes using the phandle
> + of the most external one.
> +
> + Eg.
> +
> + client-1 {
> + ...
> + pinctrl-0 = <&node-1>;
> + ...
> + };
> +
> + client-2 {
> + ...
> + pinctrl-0 = <&node-2>;
> + ...
> + };
> +
> + Required properties:
> + - pinmux:
> + integer array representing pin number and pin multiplexing configuration.
> + When a pin has to be configured in alternate function mode, use this
> + property to identify the pin by its global index, and provide its
> + alternate function configuration number along with it.
> + When multiple pins are required to be configured as part of the same
> + alternate function they shall be specified as members of the same
> + argument list of a single "pinmux" property.
> + Integers values in the "pinmux" argument list are assembled as:
> + (PIN | MUX_FUNC << 8)
> + where PIN directly corresponds to the pl_gpio pin number and MUX_FUNC is
> + one of the alternate function identifiers defined in:
> + <include/dt-bindings/pinctrl/rzn1-pinctrl.h>
> + These identifiers collapse the IO Multiplex Configuration Level 1 and
> + Level 2 numbers that are detailed in the hardware reference manual into a
> + single number. The identifiers for Level 2 are simply offset by 10.
> + Additional identifiers are provided to specify the MDIO source peripheral.
> +
> + Optional generic properties:
Optional generic pinconf properties

Minors apart, please add my:
Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>

Thanks
j

> + - bias-disable - disable any pin bias
> + - bias-pull-up - pull up the pin with 50 KOhm
> + - bias-pull-down - pull down the pin with 50 KOhm
> + - bias-high-impedance - high impedance mode
> + - drive-strength - sink or source at most 4, 6, 8 or 12 mA
> +
> + Example:
> + A serial communication interface with a TX output pin and an RX input pin.
> +
> + &pinctrl {
> + pins_uart0: pins_uart0 {
> + pinmux = <
> + RZN1_MUX(103, UART0_I) /* UART0_TXD */
> + RZN1_MUX(104, UART0_I) /* UART0_RXD */
> + >;
> + };
> + };
> +
> + Example 2:
> + Here we set the pull up on the RXD pin of the UART.
> +
> + &pinctrl {
> + pins_uart0: pins_uart0 {
> + pinmux = <RZN1_MUX(103, UART0_I)>; /* UART0_TXD */
> +
> + pins_uart6_rx {
> + pinmux = <RZN1_MUX(104, UART0_I)>; /* UART0_RXD */
> + bias-pull-up;
> + };
> + };
> + };
> diff --git a/include/dt-bindings/pinctrl/rzn1-pinctrl.h b/include/dt-bindings/pinctrl/rzn1-pinctrl.h
> new file mode 100644
> index 000000000000..40369ee36e6a
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/rzn1-pinctrl.h
> @@ -0,0 +1,141 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Defines macros and constants for Renesas RZ/N1 pin controller pin
> + * muxing functions.
> + */
> +#ifndef __DT_BINDINGS_RZN1_PINCTRL_H
> +#define __DT_BINDINGS_RZN1_PINCTRL_H
> +
> +#define RZN1_MUX(_gpio, _func) \
> + (((RZN1_FUNC_##_func) << 8) | (_gpio))
> +
> +/*
> + * Given the different levels of muxing on the SoC, it was decided to
> + * 'linearize' them into one numerical space. So mux level 1, 2 and the MDIO
> + * muxes are all represented by one single value.
> + *
> + * You can derive the hardware value pretty easily too, as
> + * 0...9 are Level 1
> + * 10...71 are Level 2. The Level 2 mux will be set to this
> + * value - RZN1_FUNC_L2_OFFSET, and the Level 1 mux will be
> + * set accordingly.
> + * 72...103 are for the 2 MDIO muxes.
> + */
> +#define RZN1_FUNC_HIGHZ 0
> +#define RZN1_FUNC_0L 1
> +#define RZN1_FUNC_CLK_ETH_MII_RGMII_RMII 2
> +#define RZN1_FUNC_CLK_ETH_NAND 3
> +#define RZN1_FUNC_QSPI 4
> +#define RZN1_FUNC_SDIO 5
> +#define RZN1_FUNC_LCD 6
> +#define RZN1_FUNC_LCD_E 7
> +#define RZN1_FUNC_MSEBIM 8
> +#define RZN1_FUNC_MSEBIS 9
> +#define RZN1_FUNC_L2_OFFSET 10 /* I'm Special */
> +
> +#define RZN1_FUNC_HIGHZ1 (RZN1_FUNC_L2_OFFSET + 0)
> +#define RZN1_FUNC_ETHERCAT (RZN1_FUNC_L2_OFFSET + 1)
> +#define RZN1_FUNC_SERCOS3 (RZN1_FUNC_L2_OFFSET + 2)
> +#define RZN1_FUNC_SDIO_E (RZN1_FUNC_L2_OFFSET + 3)
> +#define RZN1_FUNC_ETH_MDIO (RZN1_FUNC_L2_OFFSET + 4)
> +#define RZN1_FUNC_ETH_MDIO_E1 (RZN1_FUNC_L2_OFFSET + 5)
> +#define RZN1_FUNC_USB (RZN1_FUNC_L2_OFFSET + 6)
> +#define RZN1_FUNC_MSEBIM_E (RZN1_FUNC_L2_OFFSET + 7)
> +#define RZN1_FUNC_MSEBIS_E (RZN1_FUNC_L2_OFFSET + 8)
> +#define RZN1_FUNC_RSV (RZN1_FUNC_L2_OFFSET + 9)
> +#define RZN1_FUNC_RSV_E (RZN1_FUNC_L2_OFFSET + 10)
> +#define RZN1_FUNC_RSV_E1 (RZN1_FUNC_L2_OFFSET + 11)
> +#define RZN1_FUNC_UART0_I (RZN1_FUNC_L2_OFFSET + 12)
> +#define RZN1_FUNC_UART0_I_E (RZN1_FUNC_L2_OFFSET + 13)
> +#define RZN1_FUNC_UART1_I (RZN1_FUNC_L2_OFFSET + 14)
> +#define RZN1_FUNC_UART1_I_E (RZN1_FUNC_L2_OFFSET + 15)
> +#define RZN1_FUNC_UART2_I (RZN1_FUNC_L2_OFFSET + 16)
> +#define RZN1_FUNC_UART2_I_E (RZN1_FUNC_L2_OFFSET + 17)
> +#define RZN1_FUNC_UART0 (RZN1_FUNC_L2_OFFSET + 18)
> +#define RZN1_FUNC_UART0_E (RZN1_FUNC_L2_OFFSET + 19)
> +#define RZN1_FUNC_UART1 (RZN1_FUNC_L2_OFFSET + 20)
> +#define RZN1_FUNC_UART1_E (RZN1_FUNC_L2_OFFSET + 21)
> +#define RZN1_FUNC_UART2 (RZN1_FUNC_L2_OFFSET + 22)
> +#define RZN1_FUNC_UART2_E (RZN1_FUNC_L2_OFFSET + 23)
> +#define RZN1_FUNC_UART3 (RZN1_FUNC_L2_OFFSET + 24)
> +#define RZN1_FUNC_UART3_E (RZN1_FUNC_L2_OFFSET + 25)
> +#define RZN1_FUNC_UART4 (RZN1_FUNC_L2_OFFSET + 26)
> +#define RZN1_FUNC_UART4_E (RZN1_FUNC_L2_OFFSET + 27)
> +#define RZN1_FUNC_UART5 (RZN1_FUNC_L2_OFFSET + 28)
> +#define RZN1_FUNC_UART5_E (RZN1_FUNC_L2_OFFSET + 29)
> +#define RZN1_FUNC_UART6 (RZN1_FUNC_L2_OFFSET + 30)
> +#define RZN1_FUNC_UART6_E (RZN1_FUNC_L2_OFFSET + 31)
> +#define RZN1_FUNC_UART7 (RZN1_FUNC_L2_OFFSET + 32)
> +#define RZN1_FUNC_UART7_E (RZN1_FUNC_L2_OFFSET + 33)
> +#define RZN1_FUNC_SPI0_M (RZN1_FUNC_L2_OFFSET + 34)
> +#define RZN1_FUNC_SPI0_M_E (RZN1_FUNC_L2_OFFSET + 35)
> +#define RZN1_FUNC_SPI1_M (RZN1_FUNC_L2_OFFSET + 36)
> +#define RZN1_FUNC_SPI1_M_E (RZN1_FUNC_L2_OFFSET + 37)
> +#define RZN1_FUNC_SPI2_M (RZN1_FUNC_L2_OFFSET + 38)
> +#define RZN1_FUNC_SPI2_M_E (RZN1_FUNC_L2_OFFSET + 39)
> +#define RZN1_FUNC_SPI3_M (RZN1_FUNC_L2_OFFSET + 40)
> +#define RZN1_FUNC_SPI3_M_E (RZN1_FUNC_L2_OFFSET + 41)
> +#define RZN1_FUNC_SPI4_S (RZN1_FUNC_L2_OFFSET + 42)
> +#define RZN1_FUNC_SPI4_S_E (RZN1_FUNC_L2_OFFSET + 43)
> +#define RZN1_FUNC_SPI5_S (RZN1_FUNC_L2_OFFSET + 44)
> +#define RZN1_FUNC_SPI5_S_E (RZN1_FUNC_L2_OFFSET + 45)
> +#define RZN1_FUNC_SGPIO0_M (RZN1_FUNC_L2_OFFSET + 46)
> +#define RZN1_FUNC_SGPIO1_M (RZN1_FUNC_L2_OFFSET + 47)
> +#define RZN1_FUNC_GPIO (RZN1_FUNC_L2_OFFSET + 48)
> +#define RZN1_FUNC_CAN (RZN1_FUNC_L2_OFFSET + 49)
> +#define RZN1_FUNC_I2C (RZN1_FUNC_L2_OFFSET + 50)
> +#define RZN1_FUNC_SAFE (RZN1_FUNC_L2_OFFSET + 51)
> +#define RZN1_FUNC_PTO_PWM (RZN1_FUNC_L2_OFFSET + 52)
> +#define RZN1_FUNC_PTO_PWM1 (RZN1_FUNC_L2_OFFSET + 53)
> +#define RZN1_FUNC_PTO_PWM2 (RZN1_FUNC_L2_OFFSET + 54)
> +#define RZN1_FUNC_PTO_PWM3 (RZN1_FUNC_L2_OFFSET + 55)
> +#define RZN1_FUNC_PTO_PWM4 (RZN1_FUNC_L2_OFFSET + 56)
> +#define RZN1_FUNC_DELTA_SIGMA (RZN1_FUNC_L2_OFFSET + 57)
> +#define RZN1_FUNC_SGPIO2_M (RZN1_FUNC_L2_OFFSET + 58)
> +#define RZN1_FUNC_SGPIO3_M (RZN1_FUNC_L2_OFFSET + 59)
> +#define RZN1_FUNC_SGPIO4_S (RZN1_FUNC_L2_OFFSET + 60)
> +#define RZN1_FUNC_MAC_MTIP_SWITCH (RZN1_FUNC_L2_OFFSET + 61)
> +
> +#define RZN1_FUNC_MDIO_OFFSET (RZN1_FUNC_L2_OFFSET + 62)
> +
> +/* These are MDIO0 peripherals for the RZN1_FUNC_ETH_MDIO function */
> +#define RZN1_FUNC_MDIO0_HIGHZ (RZN1_FUNC_MDIO_OFFSET + 0)
> +#define RZN1_FUNC_MDIO0_GMAC0 (RZN1_FUNC_MDIO_OFFSET + 1)
> +#define RZN1_FUNC_MDIO0_GMAC1 (RZN1_FUNC_MDIO_OFFSET + 2)
> +#define RZN1_FUNC_MDIO0_ECAT (RZN1_FUNC_MDIO_OFFSET + 3)
> +#define RZN1_FUNC_MDIO0_S3_MDIO0 (RZN1_FUNC_MDIO_OFFSET + 4)
> +#define RZN1_FUNC_MDIO0_S3_MDIO1 (RZN1_FUNC_MDIO_OFFSET + 5)
> +#define RZN1_FUNC_MDIO0_HWRTOS (RZN1_FUNC_MDIO_OFFSET + 6)
> +#define RZN1_FUNC_MDIO0_SWITCH (RZN1_FUNC_MDIO_OFFSET + 7)
> +/* These are MDIO0 peripherals for the RZN1_FUNC_ETH_MDIO_E1 function */
> +#define RZN1_FUNC_MDIO0_E1_HIGHZ (RZN1_FUNC_MDIO_OFFSET + 8)
> +#define RZN1_FUNC_MDIO0_E1_GMAC0 (RZN1_FUNC_MDIO_OFFSET + 9)
> +#define RZN1_FUNC_MDIO0_E1_GMAC1 (RZN1_FUNC_MDIO_OFFSET + 10)
> +#define RZN1_FUNC_MDIO0_E1_ECAT (RZN1_FUNC_MDIO_OFFSET + 11)
> +#define RZN1_FUNC_MDIO0_E1_S3_MDIO0 (RZN1_FUNC_MDIO_OFFSET + 12)
> +#define RZN1_FUNC_MDIO0_E1_S3_MDIO1 (RZN1_FUNC_MDIO_OFFSET + 13)
> +#define RZN1_FUNC_MDIO0_E1_HWRTOS (RZN1_FUNC_MDIO_OFFSET + 14)
> +#define RZN1_FUNC_MDIO0_E1_SWITCH (RZN1_FUNC_MDIO_OFFSET + 15)
> +
> +/* These are MDIO1 peripherals for the RZN1_FUNC_ETH_MDIO function */
> +#define RZN1_FUNC_MDIO1_HIGHZ (RZN1_FUNC_MDIO_OFFSET + 16)
> +#define RZN1_FUNC_MDIO1_GMAC0 (RZN1_FUNC_MDIO_OFFSET + 17)
> +#define RZN1_FUNC_MDIO1_GMAC1 (RZN1_FUNC_MDIO_OFFSET + 18)
> +#define RZN1_FUNC_MDIO1_ECAT (RZN1_FUNC_MDIO_OFFSET + 19)
> +#define RZN1_FUNC_MDIO1_S3_MDIO0 (RZN1_FUNC_MDIO_OFFSET + 20)
> +#define RZN1_FUNC_MDIO1_S3_MDIO1 (RZN1_FUNC_MDIO_OFFSET + 21)
> +#define RZN1_FUNC_MDIO1_HWRTOS (RZN1_FUNC_MDIO_OFFSET + 22)
> +#define RZN1_FUNC_MDIO1_SWITCH (RZN1_FUNC_MDIO_OFFSET + 23)
> +/* These are MDIO1 peripherals for the RZN1_FUNC_ETH_MDIO_E1 function */
> +#define RZN1_FUNC_MDIO1_E1_HIGHZ (RZN1_FUNC_MDIO_OFFSET + 24)
> +#define RZN1_FUNC_MDIO1_E1_GMAC0 (RZN1_FUNC_MDIO_OFFSET + 25)
> +#define RZN1_FUNC_MDIO1_E1_GMAC1 (RZN1_FUNC_MDIO_OFFSET + 26)
> +#define RZN1_FUNC_MDIO1_E1_ECAT (RZN1_FUNC_MDIO_OFFSET + 27)
> +#define RZN1_FUNC_MDIO1_E1_S3_MDIO0 (RZN1_FUNC_MDIO_OFFSET + 28)
> +#define RZN1_FUNC_MDIO1_E1_S3_MDIO1 (RZN1_FUNC_MDIO_OFFSET + 29)
> +#define RZN1_FUNC_MDIO1_E1_HWRTOS (RZN1_FUNC_MDIO_OFFSET + 30)
> +#define RZN1_FUNC_MDIO1_E1_SWITCH (RZN1_FUNC_MDIO_OFFSET + 31)
> +
> +#define RZN1_FUNC_MAX (RZN1_FUNC_MDIO_OFFSET + 32)
> +
> +#endif /* __DT_BINDINGS_RZN1_PINCTRL_H */
> --
> 2.17.1
>

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