pinctrl: pass name instead of device to pin_config_*

Obtaining a "struct pinctrl_dev *" is difficult for code not directly
related to the pinctrl subsystem. However, the device name of the pinctrl
device is fairly well known. So, modify pin_config_*() to take the device
name instead of the "struct pinctrl_dev *".

Signed-off-by: Stephen Warren <swarren@nvidia.com>
[rebased on top of refactoring code]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 41 insertions, 18 deletions

diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
index f08064368291..44321d3227e8 100644
--- a/Documentation/pinctrl.txt
+++ b/Documentation/pinctrl.txt
@@ -208,7 +208,7 @@ unconnected.
 
 For example, a platform may do this:
 
-ret = pin_config_set(dev, "FOO_GPIO_PIN", PLATFORM_X_PULL_UP);
+ret = pin_config_set("foo-dev", "FOO_GPIO_PIN", PLATFORM_X_PULL_UP);
 
 To pull up a pin to VDD. The pin configuration driver implements callbacks for
 changing pin configuration in the pin controller ops like this:
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 124762b57024..57dbb4b478db 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -39,17 +39,22 @@ int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
 
 /**
  * pin_config_get() - get the configuration of a single pin parameter
- * @pctldev: pin controller device for this pin
+ * @dev_name: name of the pin controller device for this pin
  * @name: name of the pin to get the config for
  * @config: the config pointed to by this argument will be filled in with the
  *      current pin state, it can be used directly by drivers as a numeral, or
  *      it can be dereferenced to any struct.
  */
-int pin_config_get(struct pinctrl_dev *pctldev, const char *name,
+int pin_config_get(const char *dev_name, const char *name,
                           unsigned long *config)
 {
+        struct pinctrl_dev *pctldev;
         int pin;
 
+        pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
+        if (!pctldev)
+                return -EINVAL;
+
         pin = pin_get_from_name(pctldev, name);
         if (pin < 0)
                 return pin;
@@ -82,17 +87,22 @@ int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
 
 /**
  * pin_config_set() - set the configuration of a single pin parameter
- * @pctldev: pin controller device for this pin
+ * @dev_name: name of pin controller device for this pin
  * @name: name of the pin to set the config for
  * @config: the config in this argument will contain the desired pin state, it
  *      can be used directly by drivers as a numeral, or it can be dereferenced
  *      to any struct.
  */
-int pin_config_set(struct pinctrl_dev *pctldev, const char *name,
+int pin_config_set(const char *dev_name, const char *name,
                    unsigned long config)
 {
+        struct pinctrl_dev *pctldev;
         int pin;
 
+        pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
+        if (!pctldev)
+                return -EINVAL;
+
         pin = pin_get_from_name(pctldev, name);
         if (pin < 0)
                 return pin;
@@ -101,12 +111,18 @@ int pin_config_set(struct pinctrl_dev *pctldev, const char *name,
 }
 EXPORT_SYMBOL(pin_config_set);
 
-int pin_config_group_get(struct pinctrl_dev *pctldev, const char *pin_group,
+int pin_config_group_get(const char *dev_name, const char *pin_group,
                          unsigned long *config)
 {
-        const struct pinconf_ops *ops = pctldev->desc->confops;
+        struct pinctrl_dev *pctldev;
+        const struct pinconf_ops *ops;
         int selector;
 
+        pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
+        if (!pctldev)
+                return -EINVAL;
+        ops = pctldev->desc->confops;
+
         if (!ops || !ops->pin_config_group_get) {
                 dev_err(pctldev->dev, "cannot get configuration for pin "
                         "group, missing group config get function in "
@@ -123,17 +139,24 @@ int pin_config_group_get(struct pinctrl_dev *pctldev, const char *pin_group,
 EXPORT_SYMBOL(pin_config_group_get);
 
 
-int pin_config_group_set(struct pinctrl_dev *pctldev, const char *pin_group,
+int pin_config_group_set(const char *dev_name, const char *pin_group,
                          unsigned long config)
 {
-        const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
-        const struct pinconf_ops *ops = pctldev->desc->confops;
+        struct pinctrl_dev *pctldev;
+        const struct pinconf_ops *ops;
+        const struct pinctrl_ops *pctlops;
         int selector;
         const unsigned *pins;
         unsigned num_pins;
         int ret;
         int i;
 
+        pctldev = get_pinctrl_dev_from_dev(NULL, dev_name);
+        if (!pctldev)
+                return -EINVAL;
+        ops = pctldev->desc->confops;
+        pctlops = pctldev->desc->pctlops;
+
         if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
                 dev_err(pctldev->dev, "cannot configure pin group, missing "
                         "config function in driver\n");
diff --git a/include/linux/pinctrl/pinconf.h b/include/linux/pinctrl/pinconf.h
index 8c2c88ed46b1..477922cf043a 100644
--- a/include/linux/pinctrl/pinconf.h
+++ b/include/linux/pinctrl/pinconf.h
@@ -53,39 +53,39 @@ struct pinconf_ops {
                                            unsigned selector);
 };
 
-extern int pin_config_get(struct pinctrl_dev *pctldev, const char *name,
+extern int pin_config_get(const char *dev_name, const char *name,
                           unsigned long *config);
-extern int pin_config_set(struct pinctrl_dev *pctldev, const char *name,
+extern int pin_config_set(const char *dev_name, const char *name,
                           unsigned long config);
-extern int pin_config_group_get(struct pinctrl_dev *pctldev,
+extern int pin_config_group_get(const char *dev_name,
                                 const char *pin_group,
                                 unsigned long *config);
-extern int pin_config_group_set(struct pinctrl_dev *pctldev,
+extern int pin_config_group_set(const char *dev_name,
                                 const char *pin_group,
                                 unsigned long config);
 
 #else
 
-static inline int pin_config_get(struct pinctrl_dev *pctldev, const char *name,
+static inline int pin_config_get(const char *dev_name, const char *name,
                                  unsigned long *config)
 {
         return 0;
 }
 
-static inline int pin_config_set(struct pinctrl_dev *pctldev, const char *name,
+static inline int pin_config_set(const char *dev_name, const char *name,
                                  unsigned long config)
 {
         return 0;
 }
 
-static inline int pin_config_group_get(struct pinctrl_dev *pctldev,
+static inline int pin_config_group_get(const char *dev_name,
                                        const char *pin_group,
                                        unsigned long *config)
 {
         return 0;
 }
 
-static inline int pin_config_group_set(struct pinctrl_dev *pctldev,
+static inline int pin_config_group_set(const char *dev_name,
                                        const char *pin_group,
                                        unsigned long config)
 {