[PATCH v2 1/2] pinctrl: abx500: Add device tree support
From: patrice.chotard.st
Date: Thu Jun 20 2013 - 10:05:48 EST
From: Patrice Chotard <patrice.chotard@xxxxxx>
We use the same way to define pin muxing and pin configuration
than for nomadik. So pickup code from pinctrl_nomadik.c to be
able to implement pin multiplexing and pin configuration using
the device tree. Pin configuration uses generic parsing code.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@xxxxxx>
Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxx>
---
.../devicetree/bindings/pinctrl/ste,abx500.txt | 352 ++++++++++++++++++++
drivers/pinctrl/pinctrl-abx500.c | 184 ++++++++++
2 files changed, 536 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt b/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
new file mode 100644
index 0000000..e3865e1
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
@@ -0,0 +1,352 @@
+ST Ericsson abx500 pinmux controller
+
+Required properties:
+- compatible: "stericsson,ab8500-gpio", "stericsson,ab8540-gpio",
+ "stericsson,ab8505-gpio", "stericsson,ab9540-gpio",
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices, including the meaning of the
+phrase "pin configuration node".
+
+ST Ericsson's pin configuration nodes act as a container for an arbitrary number of
+subnodes. Each of these subnodes represents some desired configuration for a
+pin, a group, or a list of pins or groups. This configuration can include the
+mux function to select on those pin(s)/group(s), and various pin configuration
+parameters, such as input, output, pull up, pull down...
+
+The name of each subnode is not important; all subnodes should be enumerated
+and processed purely based on their content.
+
+Required subnode-properties:
+- ste,pins : An array of strings. Each string contains the name of a pin or
+ group.
+
+Optional subnode-properties:
+- ste,function: A string containing the name of the function to mux to the
+ pin or group.
+
+- generic pin configuration option to use. Example :
+
+ default_cfg {
+ ste,pins = "GPIO1";
+ bias-disable;
+ };
+
+- ste,config: Handle of pin configuration node containing the generic
+ pinconfig options to use, as described in pinctrl-bindings.txt in
+ this directory. Example :
+
+ pcfg_bias_disable: pcfg_bias_disable {
+ bias-disable;
+ };
+
+ default_cfg {
+ ste,pins = "GPIO1";
+ ste.config = <&pcfg_bias_disable>;
+ };
+
+Example board file extract:
+
+&pinctrl_abx500 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&sysclkreq2_default_mode>, <&sysclkreq3_default_mode>, <&gpio3_default_mode>, <&sysclkreq6_default_mode>, <&pwmout1_default_mode>, <&pwmout2_default_mode>, <&pwmout3_default_mode>, <&adi1_default_mode>, <&dmic12_default_mode>, <&dmic34_default_mode>, <&dmic56_default_mode>, <&sysclkreq5_default_mode>, <&batremn_default_mode>, <&service_default_mode>, <&pwrctrl0_default_mode>, <&pwrctrl1_default_mode>, <&pwmextvibra1_default_mode>, <&pwmextvibra2_default_mode>, <&gpio51_default_mode>, <&gpio52_default_mode>, <&gpio53_default_mode>, <&gpio54_default_mode>, <&pdmclkdat_default_mode>;
+
+ sysclkreq2 {
+ sysclkreq2_default_mode: sysclkreq2_default {
+ default_mux {
+ ste,function = "sysclkreq";
+ ste,pins = "sysclkreq2_d_1";
+ };
+ default_cfg {
+ ste,pins = "GPIO1";
+ bias-disable;
+ };
+ };
+ };
+ sysclkreq3 {
+ sysclkreq3_default_mode: sysclkreq3_default {
+ default_mux {
+ ste,function = "sysclkreq";
+ ste,pins = "sysclkreq3_d_1";
+ };
+ default_cfg {
+ ste,pins = "GPIO2";
+ output-low;
+ };
+ };
+ };
+ gpio3 {
+ gpio3_default_mode: gpio3_default {
+ default_mux {
+ ste,function = "gpio";
+ ste,pins = "gpio3_a_1";
+ };
+ default_cfg {
+ ste,pins = "GPIO3";
+ output-low;
+ };
+ };
+ };
+ sysclkreq6 {
+ sysclkreq6_default_mode: sysclkreq6_default {
+ default_mux {
+ ste,function = "sysclkreq";
+ ste,pins = "sysclkreq6_d_1";
+ };
+ default_cfg {
+ ste,pins = "GPIO4";
+ bias-disable;
+ };
+ };
+ };
+ pwmout1 {
+ pwmout1_default_mode: pwmout1_default {
+ default_mux {
+ ste,function = "pwmout";
+ ste,pins = "pwmout1_d_1";
+ };
+ default_cfg {
+ ste,pins = "GPIO14";
+ output-low;
+ };
+ };
+ };
+ pwmout2 {
+ pwmout2_default_mode: pwmout2_default {
+ pwmout2_default_mux {
+ ste,function = "pwmout";
+ ste,pins = "pwmout2_d_1";
+ };
+ pwmout2_default_cfg {
+ ste,pins = "GPIO15";
+ output-low;
+ };
+ };
+ };
+ pwmout3 {
+ pwmout3_default_mode: pwmout3_default {
+ pwmout3_default_mux {
+ ste,function = "pwmout";
+ ste,pins = "pwmout3_d_1";
+ };
+ pwmout3_default_cfg {
+ ste,pins = "GPIO16";
+ output-low;
+ };
+ };
+ };
+ adi1 {
+
+ adi1_default_mode: adi1_default {
+ adi1_default_mux {
+ ste,function = "adi1";
+ ste,pins = "adi1_d_1";
+ };
+ adi1_default_cfg1 {
+ ste,pins = "GPIO17","GPIO19","GPIO20";
+ bias-disable;
+ };
+ adi1_default_cfg2 {
+ ste,pins = "GPIO18";
+ output-low;
+ };
+ };
+ };
+ dmic12 {
+ dmic12_default_mode: dmic12_default {
+ dmic12_default_mux {
+ ste,function = "dmic";
+ ste,pins = "dmic12_d_1";
+ };
+ dmic12_default_cfg1 {
+ ste,pins = "GPIO27";
+ output-low;
+ };
+ dmic12_default_cfg2 {
+ ste,pins = "GPIO28";
+ bias-disable;
+ };
+ };
+ };
+ dmic34 {
+ dmic34_default_mode: dmic34_default {
+ dmic34_default_mux {
+ ste,function = "dmic";
+ ste,pins = "dmic34_d_1";
+ };
+ dmic34_default_cfg1 {
+ ste,pins = "GPIO29";
+ output-low;
+ };
+ dmic34_default_cfg2 {
+ ste,pins = "GPIO30";
+ bias-disable;{
+
+ };
+ };
+ };
+ dmic56 {
+ dmic56_default_mode: dmic56_default {
+ dmic56_default_mux {
+ ste,function = "dmic";
+ ste,pins = "dmic56_d_1";
+ };
+ dmic56_default_cfg1 {
+ ste,pins = "GPIO31";
+ output-low;
+ };
+ dmic56_default_cfg2 {
+ ste,pins = "GPIO32";
+ bias-disable;
+ };
+ };
+ };
+ sysclkreq5 {
+ sysclkreq5_default_mode: sysclkreq5_default {
+ sysclkreq5_default_mux {
+ ste,function = "sysclkreq";
+ ste,pins = "sysclkreq5_d_1";
+ };
+ sysclkreq5_default_cfg {
+ ste,pins = "GPIO42";
+ output-low;
+ };
+ };
+ };
+ batremn {
+ batremn_default_mode: batremn_default {
+ batremn_default_mux {
+ ste,function = "batremn";
+ ste,pins = "batremn_d_1";
+ };
+ batremn_default_cfg {
+ ste,pins = "GPIO43";
+ bias-disable;
+ };
+ };
+ };
+ service {
+ service_default_mode: service_default {
+ service_default_mux {
+ ste,function = "service";
+ ste,pins = "service_d_1";
+ };
+ service_default_cfg {
+ ste,pins = "GPIO44";
+ bias-disable;
+ };
+ };
+ };
+ pwrctrl0 {
+ pwrctrl0_default_mux: pwrctrl0_mux {
+ pwrctrl0_default_mux {
+ ste,function = "pwrctrl";
+ ste,pins = "pwrctrl0_d_1";
+ };
+ };
+ pwrctrl0_default_mode: pwrctrl0_default {
+ pwrctrl0_default_cfg {
+ ste,pins = "GPIO45";
+ bias-disable;
+ };
+ };
+ };
+ pwrctrl1 {
+ pwrctrl1_default_mux: pwrctrl1_mux {
+ pwrctrl1_default_mux {
+ ste,function = "pwrctrl";
+ ste,pins = "pwrctrl1_d_1";
+ };
+ };
+ pwrctrl1_default_mode: pwrctrl1_default {
+ pwrctrl1_default_cfg {
+ ste,pins = "GPIO46";
+ bias-disable;
+ };
+ };
+ };
+ pwmextvibra1 {
+ pwmextvibra1_default_mode: pwmextvibra1_default {
+ pwmextvibra1_default_mux {
+ ste,function = "pwmextvibra";
+ ste,pins = "pwmextvibra1_d_1";
+ };
+ pwmextvibra1_default_cfg {
+ ste,pins = "GPIO47";
+ bias-disable;
+ };
+ };
+ };
+ pwmextvibra2 {
+ pwmextvibra2_default_mode: pwmextvibra2_default {
+ pwmextvibra2_default_mux {
+ ste,function = "pwmextvibra";
+ ste,pins = "pwmextvibra2_d_1";
+ };
+ pwmextvibra1_default_cfg {
+ ste,pins = "GPIO48";
+ bias-disable;
+ };
+ };
+ };
+ gpio51 {
+ gpio51_default_mode: gpio51_default {
+ gpio51_default_mux {
+ ste,function = "gpio";
+ ste,pins = "gpio51_a_1";
+ };
+ gpio51_default_cfg {
+ ste,pins = "GPIO51";
+ output-low;
+ };
+ };
+ };
+ gpio52 {
+ gpio52_default_mode: gpio52_default {
+ gpio52_default_mux {
+ ste,function = "gpio";
+ ste,pins = "gpio52_a_1";
+ };
+ gpio52_default_cfg {
+ ste,pins = "GPIO52";
+ bias-pull-down;
+ };
+ };
+ };
+ gpio53 {
+ gpio53_default_mode: gpio53_default {
+ gpio53_default_mux {
+ ste,function = "gpio";
+ ste,pins = "gpio53_a_1";
+ };
+ gpio53_default_cfg {
+ ste,pins = "GPIO53";
+ bias-pull-down;
+ };
+ };
+ };
+ gpio54 {
+ gpio54_default_mode: gpio54_default {
+ gpio54_default_mux {
+ ste,function = "gpio";
+ ste,pins = "gpio54_a_1";
+ };
+ gpio54_default_cfg {
+ ste,pins = "GPIO54";
+ output-low;
+ };
+ };
+ };
+ pdmclkdat {
+ pdmclkdat_default_mode: pdmclkdat_default {
+ pdmclkdat_default_mux {
+ ste,function = "pdm";
+ ste,pins = "pdmclkdat_d_1";
+ };
+ pdmclkdat_default_cfg {
+ ste,pins = "GPIO55", "GPIO56";
+ bias-disable;
+ };
+ };
+ };
+};
diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
index 84b40f7..f13a57b 100644
--- a/drivers/pinctrl/pinctrl-abx500.c
+++ b/drivers/pinctrl/pinctrl-abx500.c
@@ -30,8 +30,10 @@
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/machine.h>
#include "pinctrl-abx500.h"
+#include "pinconf.h"
/*
* The AB9540 and AB8540 GPIO support are extended versions
@@ -757,11 +759,193 @@ static void abx500_pin_dbg_show(struct pinctrl_dev *pctldev,
chip->base + offset - 1);
}
+static void abx500_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *map, unsigned num_maps)
+{
+ int i;
+
+ for (i = 0; i < num_maps; i++)
+ if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+ kfree(map[i].data.configs.configs);
+ kfree(map);
+}
+
+static int abx500_dt_reserve_map(struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps,
+ unsigned reserve)
+{
+ unsigned old_num = *reserved_maps;
+ unsigned new_num = *num_maps + reserve;
+ struct pinctrl_map *new_map;
+
+ if (old_num >= new_num)
+ return 0;
+
+ new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
+ if (!new_map)
+ return -ENOMEM;
+
+ memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
+
+ *map = new_map;
+ *reserved_maps = new_num;
+
+ return 0;
+}
+
+static int abx500_dt_add_map_mux(struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps, const char *group,
+ const char *function)
+{
+ if (*num_maps == *reserved_maps)
+ return -ENOSPC;
+
+ (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
+ (*map)[*num_maps].data.mux.group = group;
+ (*map)[*num_maps].data.mux.function = function;
+ (*num_maps)++;
+
+ return 0;
+}
+
+static int abx500_dt_add_map_configs(struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps, const char *group,
+ unsigned long *configs, unsigned num_configs)
+{
+ unsigned long *dup_configs;
+
+ if (*num_maps == *reserved_maps)
+ return -ENOSPC;
+
+ dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
+ GFP_KERNEL);
+ if (!dup_configs)
+ return -ENOMEM;
+
+ (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
+
+ (*map)[*num_maps].data.configs.group_or_pin = group;
+ (*map)[*num_maps].data.configs.configs = dup_configs;
+ (*map)[*num_maps].data.configs.num_configs = num_configs;
+ (*num_maps)++;
+
+ return 0;
+}
+
+static const char *abx500_find_pin_name(struct pinctrl_dev *pctldev,
+ const char *pin_name)
+{
+ int i, pin_number;
+ struct abx500_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
+ for (i = 0; i < npct->soc->npins; i++)
+ if (npct->soc->pins[i].number == pin_number)
+ return npct->soc->pins[i].name;
+ return NULL;
+}
+
+static int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps)
+{
+ int ret;
+ const char *function = NULL;
+ unsigned long *configs;
+ unsigned int nconfigs = 0;
+ bool has_config = 0;
+ unsigned reserve = 0;
+ struct property *prop;
+ const char *group, *gpio_name;
+ struct device_node *np_config;
+
+ ret = of_property_read_string(np, "ste,function", &function);
+ if (ret >= 0)
+ reserve = 1;
+
+ ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs);
+ if (nconfigs)
+ has_config = 1;
+
+ np_config = of_parse_phandle(np, "ste,config", 0);
+ if (np_config) {
+ ret = pinconf_generic_parse_dt_config(np_config, &configs,
+ &nconfigs);
+ if (ret)
+ goto exit;
+ has_config |= nconfigs;
+ }
+
+ ret = of_property_count_strings(np, "ste,pins");
+ if (ret < 0)
+ goto exit;
+
+ if (has_config)
+ reserve++;
+
+ reserve *= ret;
+
+ ret = abx500_dt_reserve_map(map, reserved_maps, num_maps, reserve);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "ste,pins", prop, group) {
+ if (function) {
+ ret = abx500_dt_add_map_mux(map, reserved_maps,
+ num_maps, group, function);
+ if (ret < 0)
+ goto exit;
+ }
+ if (has_config) {
+ gpio_name = abx500_find_pin_name(pctldev, group);
+
+ ret = abx500_dt_add_map_configs(map, reserved_maps,
+ num_maps, gpio_name, configs, 1);
+ if (ret < 0)
+ goto exit;
+ }
+
+ }
+exit:
+ return ret;
+}
+
+static int abx500_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map, unsigned *num_maps)
+{
+ unsigned reserved_maps;
+ struct device_node *np;
+ int ret;
+
+ reserved_maps = 0;
+ *map = NULL;
+ *num_maps = 0;
+
+ for_each_child_of_node(np_config, np) {
+ ret = abx500_dt_subnode_to_map(pctldev, np, map,
+ &reserved_maps, num_maps);
+ if (ret < 0) {
+ abx500_dt_free_map(pctldev, *map, *num_maps);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
static const struct pinctrl_ops abx500_pinctrl_ops = {
.get_groups_count = abx500_get_groups_cnt,
.get_group_name = abx500_get_group_name,
.get_group_pins = abx500_get_group_pins,
.pin_dbg_show = abx500_pin_dbg_show,
+ .dt_node_to_map = abx500_dt_node_to_map,
+ .dt_free_map = abx500_dt_free_map,
};
static int abx500_pin_config_get(struct pinctrl_dev *pctldev,
--
1.7.10
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/