linux-kernel - Re: [PATCH] gpio: omap: handle pin config bias flags

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Date:   Wed, 15 Jul 2020 23:32:03 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>, linux-omap@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: omap: handle pin config bias flags

On Wed, Jul 15, 2020 at 01:09:12PM +0300, Grygorii Strashko wrote:
> 
> 
> On 10/07/2020 01:34, Drew Fustini wrote:
> > Modify omap_gpio_set_config() to handle pin config bias flags by calling
> > gpiochip_generic_config().
> > 
> > The pin group for the gpio line must have the corresponding pinconf
> > properties:
> > 
> > PIN_CONFIG_BIAS_PULL_UP requires "pinctrl-single,bias-pullup"
> > PIN_CONFIG_BIAS_PULL_DOWN requires "pinctrl-single,bias-pulldown"
> > 
> > This is necessary for pcs_pinconf_set() to find the requested bias
> > parameter in the PIN_MAP_TYPE_CONFIGS_GROUP pinctrl map.
> > 
> > Signed-off-by: Drew Fustini <drew@...gleboard.org>
> > ---
> >   drivers/gpio/gpio-omap.c | 21 +++++++++++++++++----
> >   1 file changed, 17 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> > index b8e2ecc3eade..a471a152f318 100644
> > --- a/drivers/gpio/gpio-omap.c
> > +++ b/drivers/gpio/gpio-omap.c
> > @@ -896,12 +896,25 @@ static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
> >   				unsigned long config)
> >   {
> >   	u32 debounce;
> > +	int ret;
> 
> ret =  -ENOTSUPP;
> 
> > -	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
> > -		return -ENOTSUPP;
> > +	if ((pinconf_to_config_param(config) == PIN_CONFIG_BIAS_DISABLE) ||
> > +	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_UP) ||
> > +	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_DOWN))
> > +	{
> > +		ret = gpiochip_generic_config(chip, offset, config);
> > +	}
> > +	else if (pinconf_to_config_param(config) == PIN_CONFIG_INPUT_DEBOUNCE)
> > +	{
> > +		debounce = pinconf_to_config_argument(config);
> > +		ret = omap_gpio_debounce(chip, offset, debounce);
> > +	}
> > +	else
> > +	{
> > +		ret = -ENOTSUPP;
> > +	}
> 
> drop above "else"?
> 
> > -	debounce = pinconf_to_config_argument(config);
> > -	return omap_gpio_debounce(chip, offset, debounce);
> > +	return ret;
> >   }
> >   static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> > 
> 
> Minor comment, Otherwise:
> Acked-by: Grygorii Strashko <grygorii.strashko@...com>
> 
> -- 
> Best regards,
> grygorii

Thanks for reviewing.  I'll post a new version with the return value
improvement per your suggestion.

-Drew