linux-kernel - Re: [PATCH 1/2] dt-bindings: i2c-mux-gpio: Add optional DT property

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Message-ID: <YXhlEYr2zygThVsj@robh.at.kernel.org>
Date:   Tue, 26 Oct 2021 15:29:05 -0500
From:   Rob Herring <robh@...nel.org>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     peda@...ntia.se, peter.korsgaard@...co.com,
        lars.povlsen@...rochip.com, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: i2c-mux-gpio: Add optional DT property

On Wed, Oct 13, 2021 at 04:10:02PM +0200, Horatiu Vultur wrote:
> Add optional property 'select-delay' DT property. In case this is set
> then a delay is added when changing mux state. The value is specified in
> usec.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt
> index d4cf10582a26..d0dacbad491a 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt
> @@ -28,6 +28,7 @@ Required properties:
>  Optional properties:
>  - idle-state: value to set the muxer to when idle. When no value is
>    given, it defaults to the last value used.
> +- select-delay: GPIO settle delay when changing mux state. In usec.

Seems generally useful. Can we add this first to the mux control 
binding, then use it here (or better yet, use the mux binding if you 
can instead).

Also, properties with units need a standard unit suffix.

>  
>  For each i2c child node, an I2C child bus will be created. They will
>  be numbered based on their order in the device tree.
> -- 
> 2.33.0
> 
>