From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Date: Mon, 20 Jul 2015 15:32:03 +0000 Subject: [PATCH v2 06/10] pwm: add the PWM initial state retrieval infra Message-Id: <1437406327-6207-7-git-send-email-boris.brezillon@free-electrons.com> List-Id: References: <1437406327-6207-1-git-send-email-boris.brezillon@free-electrons.com> In-Reply-To: <1437406327-6207-1-git-send-email-boris.brezillon@free-electrons.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org 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 --- 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); -- 1.9.1