[PATCH 1/3] pinctrl: export pin_request to support parent pin

[Jun Nie <jun.nie@xxxxxxxxxx>]

Some pin functions may be controlled in 2nd level multiplex.
We need configure 1st level multiplex when request such
functions. Export pin_request functionality so that parent
can be configured automatically with calling it in
pinmux_ops->request().

Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
---
 drivers/pinctrl/core.c          | 20 ++++++++++++++++++++
 drivers/pinctrl/pinmux.c        |  3 ++-
 drivers/pinctrl/pinmux.h        |  9 +++++++++
 include/linux/pinctrl/pinctrl.h |  2 ++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index fb38e20..0782a93 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -688,6 +688,26 @@ int pinctrl_gpio_direction_output(unsigned gpio)
 }
 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
 
+/**
+ * pinctrl_request_pin() - request a single pin to be used
+ * @offset: the pin number from pinctrl dev pin number space
+ */
+int pinctrl_request_pin(struct pinctrl_dev *pctldev,
+			int offset, const char *owner)
+{
+	int ret;
+
+	mutex_lock(&pctldev->mutex);
+
+	ret = pin_request(pctldev, offset, owner, NULL);
+
+	mutex_unlock(&pctldev->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_request_pin);
+
+
 static struct pinctrl_state *find_state(struct pinctrl *p,
 					const char *name)
 {
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index ece7028..b18c1f0 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -80,7 +80,7 @@ int pinmux_validate_map(struct pinctrl_map const *map, int i)
  * @gpio_range: the range matching the GPIO pin if this is a request for a
  *	single GPIO pin
  */
-static int pin_request(struct pinctrl_dev *pctldev,
+int pin_request(struct pinctrl_dev *pctldev,
 		       int pin, const char *owner,
 		       struct pinctrl_gpio_range *gpio_range)
 {
@@ -180,6 +180,7 @@ out:
 
 	return status;
 }
+EXPORT_SYMBOL(pin_request);
 
 /**
  * pin_free() - release a single muxed in pin so something else can be muxed
diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h
index d1a98b1c..6ff9baf 100644
--- a/drivers/pinctrl/pinmux.h
+++ b/drivers/pinctrl/pinmux.h
@@ -30,6 +30,9 @@ int pinmux_map_to_setting(struct pinctrl_map const *map,
 void pinmux_free_setting(struct pinctrl_setting const *setting);
 int pinmux_enable_setting(struct pinctrl_setting const *setting);
 void pinmux_disable_setting(struct pinctrl_setting const *setting);
+int pin_request(struct pinctrl_dev *pctldev,
+		int pin, const char *owner,
+		struct pinctrl_gpio_range *gpio_range);
 
 #else
 
@@ -83,6 +86,12 @@ static inline void pinmux_disable_setting(
 {
 }
 
+int pin_request(struct pinctrl_dev *pctldev,
+		int pin, const char *owner,
+		struct pinctrl_gpio_range *gpio_range)
+{
+}
+
 #endif
 
 #if defined(CONFIG_PINMUX) && defined(CONFIG_DEBUG_FS)
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index a42e57d..13bb7a1 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -167,6 +167,8 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
 extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 				const char *pin_group, const unsigned **pins,
 				unsigned *num_pins);
+extern int pinctrl_request_pin(struct pinctrl_dev *pctldev,
+				int offset, const char *owner);
 
 #ifdef CONFIG_OF
 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
-- 
1.9.1

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