linux-kernel - Re: [PATCH] pinctrl: single: config: enable the pin's input

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Date:   Tue, 18 May 2021 11:01:34 +0200 (CEST)
From:   Dario Binacchi <dariobin@...ero.it>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-kernel@...r.kernel.org,
        Haojian Zhuang <haojian.zhuang@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH] pinctrl: single: config: enable the pin's input

Hi Tony,

> Il 18/05/2021 08:08 Tony Lindgren <tony@...mide.com> ha scritto:
> 
>  
> * Dario Binacchi <dariobin@...ero.it> [210514 16:38]:
> > It enables / disables the input buffer. As explained in the description
> > of 'enum pin_config_param' this does not affect the pin's ability to
> > drive output.
> > 
> > Signed-off-by: Dario Binacchi <dariobin@...ero.it>
> > ---
> > 
> >  drivers/pinctrl/pinctrl-single.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
> > index 2c9c9835f375..4e7cdb9ee855 100644
> > --- a/drivers/pinctrl/pinctrl-single.c
> > +++ b/drivers/pinctrl/pinctrl-single.c
> > @@ -534,6 +534,7 @@ static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
> >  		case PIN_CONFIG_DRIVE_STRENGTH:
> >  		case PIN_CONFIG_SLEW_RATE:
> >  		case PIN_CONFIG_MODE_LOW_POWER:
> > +		case PIN_CONFIG_INPUT_ENABLE:
> >  		default:
> >  			*config = data;
> >  			break;
> > @@ -572,6 +573,7 @@ static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
> >  			case PIN_CONFIG_DRIVE_STRENGTH:
> >  			case PIN_CONFIG_SLEW_RATE:
> >  			case PIN_CONFIG_MODE_LOW_POWER:
> > +			case PIN_CONFIG_INPUT_ENABLE:
> >  				shift = ffs(func->conf[i].mask) - 1;
> >  				data &= ~func->conf[i].mask;
> >  				data |= (arg << shift) & func->conf[i].mask;
> > @@ -918,6 +920,7 @@ static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np,
> >  	static const struct pcs_conf_type prop2[] = {
> >  		{ "pinctrl-single,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, },
> >  		{ "pinctrl-single,slew-rate", PIN_CONFIG_SLEW_RATE, },
> > +		{ "pinctrl-single,input-enable", PIN_CONFIG_INPUT_ENABLE, },
> >  		{ "pinctrl-single,input-schmitt", PIN_CONFIG_INPUT_SCHMITT, },
> >  		{ "pinctrl-single,low-power-mode", PIN_CONFIG_MODE_LOW_POWER, },
> >  	};
> 
> Looks OK to me if this works for Linus W. You need another patch to
> update the binding though:
> 
> Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> 
> Or if there is such a patch floating around, I was not in Cc :)

I'll add a documentation patch and CC you.

Thanks and regards,
Dario

> 
> Regards,
> 
> Tony