linux-kernel - Re: [PATCH v10 1/2] dt-bindings: pinctrl: mt8195: add rsel define

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Message-ID: <CAGXv+5GXg0RuOQkh4vaRmcLpehZiXnEUXBvEaObiatAa1sXvaA@mail.gmail.com>
Date:   Tue, 13 Jul 2021 15:17:49 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Zhiyong Tao <zhiyong.tao@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>, mark.rutland@....com,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...nel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        hui.liu@...iatek.com, Eddie Huang <eddie.huang@...iatek.com>,
        light.hsieh@...iatek.com, biao.huang@...iatek.com,
        hongzhou.yang@...iatek.com, sean.wang@...iatek.com,
        seiya.wang@...iatek.com, devicetree@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v10 1/2] dt-bindings: pinctrl: mt8195: add rsel define

Hi,

On Sat, Jul 10, 2021 at 4:17 PM Zhiyong Tao <zhiyong.tao@...iatek.com> wrote:
>
> This patch adds rsel define for mt8195.
>
> Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
> ---
>  include/dt-bindings/pinctrl/mt65xx.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/include/dt-bindings/pinctrl/mt65xx.h b/include/dt-bindings/pinctrl/mt65xx.h
> index 7e16e58fe1f7..f5934abcd1bd 100644
> --- a/include/dt-bindings/pinctrl/mt65xx.h
> +++ b/include/dt-bindings/pinctrl/mt65xx.h
> @@ -16,6 +16,15 @@
>  #define MTK_PUPD_SET_R1R0_10 102
>  #define MTK_PUPD_SET_R1R0_11 103
>
> +#define MTK_PULL_SET_RSEL_000  200
> +#define MTK_PULL_SET_RSEL_001  201
> +#define MTK_PULL_SET_RSEL_010  202
> +#define MTK_PULL_SET_RSEL_011  203
> +#define MTK_PULL_SET_RSEL_100  204
> +#define MTK_PULL_SET_RSEL_101  205
> +#define MTK_PULL_SET_RSEL_110  206
> +#define MTK_PULL_SET_RSEL_111  207
> +

Instead of all the obscure macros and the new custom "rsel" property,
which BTW is not in the bindings, can't we just list the actual bias
resistance of each setting? We could also migrate away from R1R0.

Then we can specify the setting with the standard bias-pull-up/down
properties [1].

Also, please ask internally if Mediatek could relicense all the header
files that Mediatek has contributed under include/dt-bindings/pinctrl/ [2]
to GPL-2.0 and BSD dual license. These files are part of the DT bindings
and we really want them to be dual licensed as well, and not just the
YAML files.

Regards
ChenYu

[1] https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml#L37
[2] Note that a few files were contributed by other people

>  #define MTK_DRIVE_2mA  2
>  #define MTK_DRIVE_4mA  4
>  #define MTK_DRIVE_6mA  6
> --
> 2.18.0
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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