[PATCH v7] pinctrl: mediatek: add rsel setting on MT8195

[zhiyong tao]

On Wed, 2021-05-19 at 02:09 +0200, Linus Walleij wrote:
> On Mon, Apr 26, 2021 at 4:45 AM Zhiyong Tao <zhiyong.tao at mediatek.com> wrote:
> 
> > This patch provides rsel setting on MT8195.
> >
> > Signed-off-by: Zhiyong Tao <zhiyong.tao at mediatek.com>
> 
> I am suspicious about this patch, sorry for taking so long to answer.
> 
> First explain what "rsel" means, because with no explanation I
> suspect it means "rail select" which is what we already have the
> existing generic property PIN_CONFIG_POWER_SOURCE
> and power-source = <> in DT for.
> 
> Also add the custom properties to:
> Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> (separate patch)

> Yours,
> Linus Walleij

==>
Hi Linus walleij,

Thanks for your suggestion.

rsel: resistance selection, we can set rsel from 0 to 7 to set different
resistance. such as:

MTK_PULL_SET_RSEL_000:75K in PU, 75k in PD;
MTK_PULL_SET_RSEL_001:10k in PU, 5k in PD;
MTK_PULL_SET_RSEL_010:5k in PU, 75k in PD;
MTK_PULL_SET_RSEL_011:4k in PU, 5K in PD;
MTK_PULL_SET_RSEL_100:3k in PU, 75k in PD;
MTK_PULL_SET_RSEL_101:2k in PU, 5K in PD;
MTK_PULL_SET_RSEL_110:1.5k in PU, 75k in PD;
MTK_PULL_SET_RSEL_111:1k in PU, 5k in PD.

It seems can flow bias-pull-up/down property. we change it in v10. 

Thanks