linux-kernel - Re: [PATCH v13 2/5] dt-bindings: pinctrl: mt8195: change pull up/down description

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Date:   Thu, 23 Sep 2021 20:00:23 -0500
From:   Rob Herring <robh@...nel.org>
To:     Zhiyong Tao <zhiyong.tao@...iatek.com>
Cc:     linus.walleij@...aro.org, mark.rutland@....com,
        matthias.bgg@...il.com, sean.wang@...nel.org,
        srv_heupstream@...iatek.com, hui.liu@...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,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v13 2/5] dt-bindings: pinctrl: mt8195: change pull
 up/down description

On Wed, Sep 22, 2021 at 10:56:37AM +0800, Zhiyong Tao wrote:
> For supporting SI units in "bias-pull-down" & "bias-pull-up",
> Change pull up/down description
> 
> Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
> ---
>  .../bindings/pinctrl/pinctrl-mt8195.yaml      | 65 ++++++++++++++++++-
>  1 file changed, 63 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> index 2f12ec59eee5..2f2afabbe4fc 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> @@ -85,9 +85,70 @@ 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-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 by identifying property "mediatek,rsel_resistance_in_si_unit".
> +          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.

Please make a schema:

oneOf:
  - enum: [ 0, 1, ...7 ]
  - description: MT8195...
    enum: [ 5000, 75000 ]

> +          An example of using RSEL define:
> +          pincontroller {
> +            i2c0_pin {
> +              pinmux = <PINMUX_GPIO8__FUNC_SDA0>;
> +              bias-pull-down = <MTK_PULL_SET_RSEL_001>;
> +            };
> +          };
> +          An example of using si unit resistance value(ohm):
> +          &pio {
> +            mediatek,rsel_resistance_in_si_unit;
> +          }
> +          pincontroller {
> +            i2c0_pin {
> +              pinmux = <PINMUX_GPIO8__FUNC_SDA0>;
> +              bias-pull-down = <75000>;
> +            };
> +          };
>  
> -      bias-pull-up: true
> +      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 by identifying property "mediatek,rsel_resistance_in_si_unit".
> +          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.

Same here.

> +          An example of using RSEL define:
> +          pincontroller {
> +            i2c0_pin {
> +              pinmux = <PINMUX_GPIO8__FUNC_SDA0>;
> +              bias-pull-up = <MTK_PULL_SET_RSEL_001>;
> +            };
> +          };
> +          An example of using si unit resistance value(ohm):
> +          &pio {
> +            mediatek,rsel_resistance_in_si_unit;
> +          }
> +          pincontroller {
> +            i2c0_pin {
> +              pinmux = <PINMUX_GPIO8__FUNC_SDA0>;
> +              bias-pull-up = <1000>;
> +            };
> +          };
>  
>        bias-disable: true
>  
> -- 
> 2.25.1
> 
>