[PATCH v2 06/10] pwm: add the PWM initial state retrieval infra
From: Boris Brezillon <hidden>
Date: 2015-07-20 15:33:30
Also in:
linux-arm-kernel, 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> --- drivers/pwm/core.c | 3 +++ include/linux/pwm.h | 5 +++++ 2 files changed, 8 insertions(+)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3e830ce..236a8cf 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->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 1e6e9d1..df78211 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h@@ -168,6 +168,9 @@ 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 */
@@ -186,6 +189,8 @@ struct pwm_ops { 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);
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1.9.1