[RFC PATCH 10/15] pwm: add the PWM initial state retrieval infra

Boris Brezillon
2015-07-01T08:21:56Z

Add a ->init_state() function to the pwm_ops struct to let PWM drivers
initialize the PWM state attached to a PWM device.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/pwm/core.c | 3 +++
include/linux/pwm.h | 2 ++
2 files changed, 5 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3e830ce..30631f5 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -264,6 +264,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
pwm->hwpwm = i;
pwm_set_default_polarity(pwm, polarity);

+ if (chip->ops->init_state)
+ chip->ops->init_state(chip, pwm);
+
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 0f36a06..b47244a 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -177,6 +177,8 @@ struct pwm_ops {
struct pwm_device *pwm);
void (*disable)(struct pwm_chip *chip,
struct pwm_device *pwm);
+ void (*init_state)(struct pwm_chip *chip,
+ struct pwm_device *pwm);
#ifdef CONFIG_DEBUG_FS
void (*dbg_show)(struct pwm_chip *chip,
struct seq_file *s);
--
1.9.1