linux-kernel - Re: [PATCH 3/9] pinctrl: sunxi: Handle bias disable

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Date:   Tue, 4 Oct 2016 10:14:29 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/9] pinctrl: sunxi: Handle bias disable

On Mon, Oct 3, 2016 at 6:21 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> So far, putting NO_PULL in allwinner,pull was ignored, behaving like if
> that property was not there at all.
>
> Obviously, this is not the right thing to do, and in that case, we really
> need to just disable the bias.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

I've done the same in my patches.

Acked-by: Chen-Yu Tsai <wens@...e.org>

> ---
>  drivers/pinctrl/sunxi/pinctrl-sunxi.c | 8 ++++++++
>  1 file changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> index 5be455d5e252..6f6f1e0011e2 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> @@ -166,6 +166,8 @@ static int sunxi_pctrl_parse_bias_prop(struct device_node *node)
>                 return -EINVAL;
>
>         switch (val) {
> +       case SUN4I_PINCTRL_NO_PULL:
> +               return PIN_CONFIG_BIAS_DISABLE;
>         case SUN4I_PINCTRL_PULL_UP:
>                 return PIN_CONFIG_BIAS_PULL_UP;
>         case SUN4I_PINCTRL_PULL_DOWN:
> @@ -402,6 +404,12 @@ static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
>                                 | dlevel << sunxi_dlevel_offset(pin),
>                                 pctl->membase + sunxi_dlevel_reg(pin));
>                         break;
> +               case PIN_CONFIG_BIAS_DISABLE:
> +                       val = readl(pctl->membase + sunxi_pull_reg(pin));
> +                       mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
> +                       writel((val & ~mask),
> +                              pctl->membase + sunxi_pull_reg(pin));
> +                       break;
>                 case PIN_CONFIG_BIAS_PULL_UP:
>                         val = readl(pctl->membase + sunxi_pull_reg(pin));
>                         mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
> --
> git-series 0.8.10