[PATCH] pwm: imx: Port "pwm: imx: support output polarity inversion" to Linux v4.7

[Lukasz Majewski]

Dear all,

> Dear Lothar, Stefan,
> 
> > This patch ports "pwm: imx: support output polarity inversion" patch
> > set written by Lothar Wassmann (v6 from 10.2014).
> > 
> 
> I've read the e-mail from Stefan regarding missing support for pwm-imx
> polarity inversion feature.
> 
> I also would like to see it in ML. Hence, my patch. Lothar, please
> feel free to squash it to your patches when you (I hope :-) ) will
> prepare v7 of this feature.
> 
> I hope that this would help.

Was there any decision about those patches?

Would they be included to main line anytime soon?

Best regards,
Łukasz Majewski

> 
> Best regards,
> Łukasz Majewski
> 
> > It is used to control backlight of panels via inverted PWM signal.
> > 
> > The "inversion" of PWM output is not an issue at such devices, since
> > separate GPIO pin is responsible for enabling and disabling the
> > panel's backlight.
> > 
> > This patch should be put on top of:
> > 
> > https://patchwork.kernel.org/patch/5065841/
> > https://patchwork.kernel.org/patch/5065821/
> > https://patchwork.kernel.org/patch/5065811/
> > 
> > 
> > Signed-off-by: Lukasz Majewski <l.majewski at majess.pl>
> > ---
> >  drivers/pwm/pwm-imx.c | 20 ++++++++++++++------
> >  1 file changed, 14 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> > index 471a99e..c37d223 100644
> > --- a/drivers/pwm/pwm-imx.c
> > +++ b/drivers/pwm/pwm-imx.c
> > @@ -181,7 +181,7 @@ static int imx_pwm_config_v2(struct pwm_chip
> > *chip, if (enable)
> >  		cr |= MX3_PWMCR_EN;
> >  
> > -	if (pwm->polarity == PWM_POLARITY_INVERSED)
> > +	if (pwm->args.polarity == PWM_POLARITY_INVERSED)
> >  		cr |= MX3_PWMCR_POUTC;
> >  
> >  	writel(cr, imx->mmio_base + MX3_PWMCR);
> > @@ -201,11 +201,6 @@ static void imx_pwm_set_enable_v2(struct
> > pwm_chip *chip, bool enable) else
> >  		val &= ~MX3_PWMCR_EN;
> >  
> > -	if (chip->pwms[0].polarity == PWM_POLARITY_INVERSED)
> > -		val |= MX3_PWMCR_POUTC;
> > -	else
> > -		val &= ~MX3_PWMCR_POUTC;
> > -
> >  	writel(val, imx->mmio_base + MX3_PWMCR);
> >  }
> >  
> > @@ -253,6 +248,19 @@ static int imx_pwm_set_polarity(struct pwm_chip
> > *chip, struct pwm_device *pwm, enum pwm_polarity polarity)
> >  {
> >  	struct imx_chip *imx = to_imx_chip(chip);
> > +	u32 val;
> > +
> > +	if (polarity == pwm->args.polarity)
> > +		return 0;
> > +
> > +	val = readl(imx->mmio_base + MX3_PWMCR);
> > +
> > +	if (polarity == PWM_POLARITY_INVERSED)
> > +		val |= MX3_PWMCR_POUTC;
> > +	else
> > +		val &= ~MX3_PWMCR_POUTC;
> > +
> > +	writel(val, imx->mmio_base + MX3_PWMCR);
> >  
> >  	dev_dbg(imx->chip.dev, "%s: polarity set to %s\n",
> > __func__, polarity == PWM_POLARITY_INVERSED ? "inverted" :
> > "normal");
> 

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