pinctrl: Add pinctrl_pm_select_init_state helper function

If a platform requires an initial pinctrl state during probing, this
helper function provides the client with access to the same initial
state.

eg:
xxx_suspend_noirq
...
pinctrl_pm_select_sleep_state

xxx resume_noirq
pinctrl_pm_select_init_state
...
pinctrl_pm_select_default_state

Signed-off-by: Christian Bruel <[e-mail]>
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/pinctrl/core.c

···
 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
 
 /**
+ * pinctrl_pm_select_init_state() - select init pinctrl state for PM
+ * @dev: device to select init state for
+ */
+int pinctrl_pm_select_init_state(struct device *dev)
+{
+	if (!dev->pins)
+		return 0;
+
+	return pinctrl_select_bound_state(dev, dev->pins->init_state);
+}
+EXPORT_SYMBOL_GPL(pinctrl_pm_select_init_state);
+
+/**
  * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
  * @dev: device to select sleep state for
  */

include/linux/pinctrl/consumer.h

···
 
 #ifdef CONFIG_PM
 int pinctrl_pm_select_default_state(struct device *dev);
+int pinctrl_pm_select_init_state(struct device *dev);
 int pinctrl_pm_select_sleep_state(struct device *dev);
 int pinctrl_pm_select_idle_state(struct device *dev);
 #else
 static inline int pinctrl_pm_select_default_state(struct device *dev)
+{
+	return 0;
+}
+static inline int pinctrl_pm_select_init_state(struct device *dev)
 {
 	return 0;
 }
···
 }
 
 static inline int pinctrl_pm_select_default_state(struct device *dev)
+{
+	return 0;
+}
+
+static inline int pinctrl_pm_select_init_state(struct device *dev)
 {
 	return 0;
 }