linux-kernel - [PATCH v3 3/4] pwm: core: Export of_pwm_request() so client drivers can also use it

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Date:	Mon, 10 Dec 2012 11:00:36 +0100
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Thierry Reding <thierry.reding@...onic-design.de>
CC:	<linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-leds@...r.kernel.org>
Subject: [PATCH v3 3/4] pwm: core: Export of_pwm_request() so client drivers can also use it

Allow client driver to use of_pwm_request() to get the pwm they need. This
is needed for drivers which handle more than one pwm separately, like
leds-pwm driver which have:

pwmleds {
	compatible = "pwm-leds";
	kpad {
		label = "omap4::keypad";
		pwms = <&twl_pwm 0 7812500>;
		max-brightness = <127>;
	};

	charging {
		label = "omap4:green:chrg";
		pwms = <&twl_pwmled 0 7812500>;
		max-brightness = <255>;
	};
};

in the dts files.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/pwm/core.c  | 2 +-
 include/linux/pwm.h | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 903138b..3a7ebcc 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -486,7 +486,7 @@ static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
  * becomes mandatory for devices that look up the PWM device via the con_id
  * parameter.
  */
-static struct pwm_device *of_pwm_request(struct device_node *np,
+struct pwm_device *of_pwm_request(struct device_node *np,
 					 const char *con_id)
 {
 	struct pwm_device *pwm = NULL;
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 6d661f3..d70ffe3 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -175,6 +175,7 @@ struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
 		const struct of_phandle_args *args);
 
 struct pwm_device *pwm_get(struct device *dev, const char *consumer);
+struct pwm_device *of_pwm_request(struct device_node *np, const char *con_id);
 void pwm_put(struct pwm_device *pwm);
 
 struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer);
@@ -213,6 +214,12 @@ static inline struct pwm_device *pwm_get(struct device *dev,
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct pwm_device *of_pwm_request(struct device_node *np,
+						const char *con_id)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline void pwm_put(struct pwm_device *pwm)
 {
 }
-- 
1.8.0

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