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    Subject[PATCH v3 06/12] pwm: add the PWM initial state retrieval infra
    Date
    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 <boris.brezillon@free-electrons.com>
    ---
    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 963238c3..60ad758 100644
    --- a/drivers/pwm/core.c
    +++ b/drivers/pwm/core.c
    @@ -270,6 +270,9 @@ 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 f8cc460..cddb12b 100644
    --- a/include/linux/pwm.h
    +++ b/include/linux/pwm.h
    @@ -179,6 +179,9 @@ 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
    */
    @@ -191,6 +194,7 @@ 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
    --
    1.9.1


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