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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2012-12-21 01:43:59 -0800
committerBryan Wu <cooloney@gmail.com>2013-02-01 17:47:05 -0800
commit261a5edd3ac77ecb4b33310a1dd1ed8d656f0569 (patch)
tree61e966d8cdd8c116f128cbe3843841661f0f254c /drivers/pwm
parent8eb9612799605a7988d1c97cdc5980a5b8f04c56 (diff)
downloadvexpress-lsk-261a5edd3ac77ecb4b33310a1dd1ed8d656f0569.tar.gz
pwm: Add devm_of_pwm_get() as exported API for users
When booted with DT users can use devm version of of_pwm_get() to benefit from automatic resource release. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/core.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3cb741dc203..4a13da48fef 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -708,6 +708,36 @@ struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
}
EXPORT_SYMBOL_GPL(devm_pwm_get);
+/**
+ * devm_of_pwm_get() - resource managed of_pwm_get()
+ * @dev: device for PWM consumer
+ * @np: device node to get the PWM from
+ * @con_id: consumer name
+ *
+ * This function performs like of_pwm_get() but the acquired PWM device will
+ * automatically be released on driver detach.
+ */
+struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
+ const char *con_id)
+{
+ struct pwm_device **ptr, *pwm;
+
+ ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ pwm = of_pwm_get(np, con_id);
+ if (!IS_ERR(pwm)) {
+ *ptr = pwm;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return pwm;
+}
+EXPORT_SYMBOL_GPL(devm_of_pwm_get);
+
static int devm_pwm_match(struct device *dev, void *res, void *data)
{
struct pwm_device **p = res;