On Wed, Mar 30, 2016 at 10:03:38PM +0200, Boris Brezillon wrote:
> The PWM state, represented by its period, duty_cycle and polarity,
> is currently directly stored in the PWM device.
> Declare a pwm_state structure embedding those field so that we can later
> use this struct to atomically update all the PWM parameters at once.
> 
> All pwm_get_xxx() helpers are now implemented as wrappers around
> pwm_get_state().
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  drivers/pwm/core.c  |  8 ++++----
>  include/linux/pwm.h | 54 +++++++++++++++++++++++++++++++++++++++++------------
>  2 files changed, 46 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 6433059..f3f91e7 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -268,7 +268,7 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
>  		pwm->chip = chip;
>  		pwm->pwm = chip->base + i;
>  		pwm->hwpwm = i;
> -		pwm->polarity = polarity;
> +		pwm->state.polarity = polarity;

Would this not more correctly be assigned to pwm->args.polarity? After
all this is setting up the "initial" state, much like DT or the lookup
tables would for duty cycle and period.

Thierry