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Date: Thu, 9 Jun 2022 10:19:49 -0400
From: Nícolas F. R. A. Prado
<nfraprado@...labora.com>
To: Guodong Liu <guodong.liu@...iatek.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>, kernel@...labora.com,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Sean Wang <sean.wang@...iatek.com>, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] dt-bindings: pinctrl: mt8192: Switch
drive-strength-adv for -microamp
Hi Guodong,
On Wed, Jun 08, 2022 at 04:08:13PM +0800, Guodong Liu wrote:
> -----Original Message-----
> From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> To: Linus Walleij <linus.walleij@...aro.org>
> Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com
> >, kernel@...labora.com, Nícolas F. R. A. Prado <
> nfraprado@...labora.com>, Krzysztof Kozlowski <
> krzysztof.kozlowski+dt@...aro.org>, Matthias Brugger <
> matthias.bgg@...il.com>, Rob Herring <robh+dt@...nel.org>, Sean Wang <
> sean.wang@...iatek.com>, devicetree@...r.kernel.org,
> linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
> linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
> Subject: [PATCH v2 1/2] dt-bindings: pinctrl: mt8192: Switch drive-
> strength-adv for -microamp
> Date: Tue, 31 May 2022 18:19:53 -0400
>
> Commit e5fabbe43f3f ("pinctrl: mediatek: paris: Support generic
> PIN_CONFIG_DRIVE_STRENGTH_UA") added support for using
> drive-strength-microamp instead of mediatek,drive-strength-adv.
>
> Since there aren't any users of mediatek,drive-strength-adv on mt8192
> yet, remove this property and add drive-strength-microamp in its place,
> which has a clearer meaning.
>
> While at it, add a new 'if' block to validate that drive-strength and
> drive-strength-microamp aren't used together, since they're mutually
> exclusive.
>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogiocchino.delregno@...labora.com>
> ---
>
> Changes in v2:
> - Added 'if' block to make drive-strength and drive-strength-microamp
> mutually exclusive
> - Changed commit title to be more precise
> - Dropped Fixes tag
>
> .../bindings/pinctrl/pinctrl-mt8192.yaml | 35 ++++++-------------
> 1 file changed, 10 insertions(+), 25 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-
> mt8192.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-
> mt8192.yaml
> index c90a132fbc79..c8092b218f2f 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml
> @@ -80,31 +80,8 @@ patternProperties:
> dt-bindings/pinctrl/mt65xx.h. It can only support
> 2/4/6/8/10/12/14/16mA in mt8192.
> enum: [2, 4, 6, 8, 10, 12, 14, 16]
>
> - mediatek,drive-strength-adv:
> - description: |
> - Describe the specific driving setup property.
> - For I2C pins, the existing generic driving setup can
> only support
> - 2/4/6/8/10/12/14/16mA driving. But in specific driving
> setup, they
> - can support 0.125/0.25/0.5/1mA adjustment. If we enable
> specific
> - driving setup, the existing generic setup will be
> disabled.
> - The specific driving setup is controlled by E1E0EN.
> - When E1=0/E0=0, the strength is 0.125mA.
> - When E1=0/E0=1, the strength is 0.25mA.
> - When E1=1/E0=0, the strength is 0.5mA.
> - When E1=1/E0=1, the strength is 1mA.
> - EN is used to enable or disable the specific driving
> setup.
> - Valid arguments are described as below:
> - 0: (E1, E0, EN) = (0, 0, 0)
> - 1: (E1, E0, EN) = (0, 0, 1)
> - 2: (E1, E0, EN) = (0, 1, 0)
> - 3: (E1, E0, EN) = (0, 1, 1)
> - 4: (E1, E0, EN) = (1, 0, 0)
> - 5: (E1, E0, EN) = (1, 0, 1)
> - 6: (E1, E0, EN) = (1, 1, 0)
> - 7: (E1, E0, EN) = (1, 1, 1)
> - So the valid arguments are from 0 to 7.
> - $ref: /schemas/types.yaml#/definitions/uint32
> - enum: [0, 1, 2, 3, 4, 5, 6, 7]
>
> Can't remove mediatek,drive-strength-adv property, I2C pins will ofter
> use this property
Yes, the point is that they should use drive-strength-microamp instead, which
does the exact same thing while also having a clearer meaning.
>
> + drive-strength-microamp:
> + enum: [125, 250, 500, 1000]
>
> mediatek,pull-up-adv:
> description: |
> @@ -138,6 +115,14 @@ patternProperties:
> required:
> - pinmux
>
> + allOf:
> + - if:
> + required:
> + - drive-strength-microamp
> + then:
> + properties:
> + drive-strength: false
> +
> additionalProperties: false
>
> Property drive-strength-microamp and drive-strength aren't exclusive,
> just i2c pins support drive-strength-microamp property .
They are exclusive in the sense that both drive-strength-microamp and
drive-strength shouldn't be used on the same pin configuration. The fact that
only i2c pins use drive-strength-microamp doesn't have to do with this, and is
perfectly fine.
Thanks,
Nícolas
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