[PATCH v4 19/24] pwm: add the PWM initial state retrieval infra
From: Boris Brezillon <hidden>
Date: 2015-11-16 08:59:12
Also in:
linux-clk, linux-fbdev, linux-input, linux-leds, linux-pwm, linux-rockchip, lkml
Subsystem:
pwm subsystem, the rest · Maintainers:
Uwe Kleine-König, Linus Torvalds
Add a ->reset_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 <redacted> Tested-by: Heiko Stuebner <heiko@sntech.de> --- drivers/pwm/core.c | 3 +++ include/linux/pwm.h | 4 ++++ 2 files changed, 7 insertions(+)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 6bbda6c..ce8b373 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c@@ -271,6 +271,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip, pwm_set_default_polarity(pwm, polarity); mutex_init(&pwm->lock); + if (chip->ops->reset_state) + chip->ops->reset_state(chip, pwm); + radix_tree_insert(&pwm_tree, pwm->pwm, pwm); }
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 292e7da..caa0ffe 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h@@ -182,6 +182,9 @@ static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) * @set_polarity: configure the polarity of this PWM * @enable: enable PWM output toggling * @disable: disable PWM output toggling + * @reset_state: reset the current PWM state (pwm->state) to the actual + * hardware state. This function is only called once per + * PWM device when the PWM chip is registered. * @dbg_show: optional routine to show contents in debugfs * @owner: helps prevent removal of modules exporting active PWMs */
@@ -194,6 +197,7 @@ struct pwm_ops { enum pwm_polarity polarity); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); + void (*reset_state)(struct pwm_chip *chip, struct pwm_device *pwm); #ifdef CONFIG_DEBUG_FS void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s); #endif
--
2.1.4