Re: [PATCH 1/3] pwm: stm32: Remove clutter from ternary operator

[Thierry Reding <thierry.reding@gmail.com>]

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On Wed, Oct 16, 2019 at 10:26:12AM +0200, Uwe Kleine-König wrote:
> On Wed, Oct 16, 2019 at 09:38:40AM +0200, Thierry Reding wrote:
> > Remove usage of the ternary operator to assign values for register
> > fields. This removes clutter and improves readability.
> > 
> > Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
> > ---
> >  drivers/pwm/pwm-stm32.c | 18 +++++++++++++-----
> >  1 file changed, 13 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
> > index 9430b4cd383f..b12fb11b7a55 100644
> > --- a/drivers/pwm/pwm-stm32.c
> > +++ b/drivers/pwm/pwm-stm32.c
> > @@ -493,11 +493,19 @@ static const struct pwm_ops stm32pwm_ops = {
> >  static int stm32_pwm_set_breakinput(struct stm32_pwm *priv,
> >  				    int index, int level, int filter)
> >  {
> > -	u32 bke = (index == 0) ? TIM_BDTR_BKE : TIM_BDTR_BK2E;
> > -	int shift = (index == 0) ? TIM_BDTR_BKF_SHIFT : TIM_BDTR_BK2F_SHIFT;
> > -	u32 mask = (index == 0) ? TIM_BDTR_BKE | TIM_BDTR_BKP | TIM_BDTR_BKF
> > -				: TIM_BDTR_BK2E | TIM_BDTR_BK2P | TIM_BDTR_BK2F;
> > -	u32 bdtr = bke;
> > +	u32 bke, shift, mask, bdtr;
> > +
> > +	if (index == 0) {
> > +		bke = TIM_BDTR_BKE;
> > +		shift = TIM_BDTR_BKF_SHIFT;
> > +		mask = TIM_BDTR_BKE | TIM_BDTR_BKP | TIM_BDTR_BKF;
> > +	} else {
> > +		bke = TIM_BDTR_BK2E;
> > +		shift = TIM_BDTR_BK2F_SHIFT;
> > +		mask = TIM_BDTR_BK2E | TIM_BDTR_BK2P | TIM_BDTR_BK2F;
> > +	}
> > +
> > +	bdtr = bke;
> 
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> 
> Is index always in {0, 1}? Maybe a comment or a check about that would
> be helpful. (-> separate patch I think).

The bindings say that index can only be 0 or 1. I guess strictly it
might actually depend on the number of break inputs, but given these
register definitions, there's only ever two.

But yeah, it might be a good idea to sanitize the values upon probe.
I'll add another patch to do that.

Thierry

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