linux-kernel - Re: [PATCH v2 1/2] dt-bindings: i2c: mv64xxx: add reset-gpios property

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Message-ID: <20231017193440.GA2553498-robh@kernel.org>
Date:   Tue, 17 Oct 2023 14:34:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     gregory.clement@...tlin.com, andi.shyti@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: i2c: mv64xxx: add reset-gpios
 property

On Mon, Oct 16, 2023 at 03:35:03PM +1300, Chris Packham wrote:
> Add reset-gpios and reset-delay-us properties to the marvell,mv64xxx-i2c
> binding. These can be used to describe hardware where a common reset
> GPIO is connected to all downstream devices on and I2C bus. This reset
> will be released before the downstream devices on the bus are probed.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> 
> Notes:
>     Changes in v2:
>     - Update commit message
>     - Add reset-delay-us property
> 
>  .../devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml        | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> index 461d1c9ee3f7..7223797b0572 100644
> --- a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> @@ -70,6 +70,12 @@ properties:
>    resets:
>      maxItems: 1
>  
> +  reset-gpios:
> +    maxItems: 1

It would be worth saying this is common for all downstream devices on 
the I2C bus here.

> +
> +  reset-delay-us:
> +    description: Delay in us to wait after reset gpio de-assertion.
> +
>    dmas:
>      items:
>        - description: RX DMA Channel
> -- 
> 2.42.0
>