[PATCH 2/3] pwm: Add a devm managed function to add pwm_chips

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

This potentially simplifies pwm lowlevel drivers.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/core.c  | 19 +++++++++++++++++++
 include/linux/pwm.h |  3 +++
 2 files changed, 22 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index a8eff4b3ee36..2ffceb69e00b 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -383,6 +383,25 @@ int pwmchip_remove(struct pwm_chip *chip)
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
+static void devm_pwmchip_remove(void *data)
+{
+	struct pwm_chip *chip = data;
+
+	pwmchip_remove(chip);
+}
+
+int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip)
+{
+	int ret;
+
+	ret = pwmchip_add(chip);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip);
+}
+EXPORT_SYMBOL_GPL(devm_pwmchip_add);
+
 /**
  * pwm_request() - request a PWM device
  * @pwm: global PWM device index
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e4d84d4db293..00adafbbed9e 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -396,6 +396,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
 			      enum pwm_polarity polarity);
 int pwmchip_add(struct pwm_chip *chip);
 int pwmchip_remove(struct pwm_chip *chip);
+
+int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip);
+
 struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 					 unsigned int index,
 					 const char *label);
-- 
2.30.2