linux-kernel - Re: [PATCH v11 2/4] dt-bindings: pinctrl: mt8195: change pull up/down description

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Date:   Wed, 1 Sep 2021 18:21:37 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     "zhiyong.tao" <zhiyong.tao@...iatek.com>
Cc:     Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <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 <light.hsieh@...iatek.com>,
        Biao Huang <biao.huang@...iatek.com>,
        Hongzhou Yang <hongzhou.yang@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Seiya Wang <seiya.wang@...iatek.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v11 2/4] dt-bindings: pinctrl: mt8195: change pull up/down description

On Wed, Sep 1, 2021 at 10:01 AM zhiyong.tao <zhiyong.tao@...iatek.com> wrote:
>
> On Tue, 2021-08-31 at 17:13 -0500, Rob Herring wrote:
> > On Mon, Aug 30, 2021 at 08:36:01AM +0800, Zhiyong Tao wrote:
> > > Change pull up/down description
> >
> > Every commit is a 'change'. Your commit msg should explain 'why', not
> > what the diff is.
> >
> Hi robh,
> we will add 'why' explanation in the commit msg in v12.
>
>
> > >
> > > Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
> > > ---
> > >  .../bindings/pinctrl/pinctrl-mt8195.yaml      | 32 +++++++++++++++++--
> > >  1 file changed, 29 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> > > index 2f12ec59eee5..a341ed9f0095 100644
> > > --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> > > +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> > > @@ -85,9 +85,35 @@ patternProperties:
> > >            2/4/6/8/10/12/14/16mA in mt8195.
> > >          enum: [0, 1, 2, 3, 4, 5, 6, 7]
> > >
> > > -      bias-pull-down: true
> > > -
> > > -      bias-pull-up: true
> > > +      bias-pull-down:
> > > +        description: |
> > > +          For pull down type is normal, it don't need add RSEL & R1R0 define
> > > +          and resistance value.
> > > +          For pull down type is PUPD/R0/R1 type, it can add R1R0 define to
> > > +          set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
> > > +          "MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" & "MTK_PUPD_SET_R1R0_11"
> > > +          define in mt8195.
> > > +          For pull down type is RSEL, it can add RSEL define & resistance value(ohm)
> > > +          to set different resistance. It can support "MTK_PULL_SET_RSEL_000" &
> > > +          "MTK_PULL_SET_RSEL_001" & "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011" &
> > > +          "MTK_PULL_SET_RSEL_100" & "MTK_PULL_SET_RSEL_101" & "MTK_PULL_SET_RSEL_110" &
> > > +          "MTK_PULL_SET_RSEL_111" define in mt8195. It can also support resistance value(ohm)
> > > +          "75000" & "5000" in mt8195.
> >
> > Sounds like constraints on the values. Please write a schema.
> >
> we will add a schema here in v12.

Could the description be written to encourage device tree authors to
use SI units instead of the macros?

Thanks
ChenYu

>
> Thanks
> > > +
> > > +      bias-pull-up:
> > > +        description: |
> > > +          For pull up type is normal, it don't need add RSEL & R1R0 define
> > > +          and resistance value.
> > > +          For pull up type is PUPD/R0/R1 type, it can add R1R0 define to
> > > +          set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
> > > +          "MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" & "MTK_PUPD_SET_R1R0_11"
> > > +          define in mt8195.
> > > +          For pull up type is RSEL, it can add RSEL define & resistance value(ohm)
> > > +          to set different resistance. It can support "MTK_PULL_SET_RSEL_000" &
> > > +          "MTK_PULL_SET_RSEL_001" & "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011" &
> > > +          "MTK_PULL_SET_RSEL_100" & "MTK_PULL_SET_RSEL_101" & "MTK_PULL_SET_RSEL_110" &
> > > +          "MTK_PULL_SET_RSEL_111" define in mt8195. It can also support resistance value(ohm)
> > > +          "1000" & "1500" & "2000" & "3000" & "4000" & "5000" & "10000" & "75000" in mt8195.
> > >
> > >        bias-disable: true
> > >
> > > --
> > > 2.18.0
> > >
> > >
>
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