Re: [PATCH 1/2] dt-bindings: i2c: tegra: Add SMBus feature properties

[Rob Herring]

On Thu, Dec 09, 2021 at 08:35:20PM +0530, Akhil R wrote:
> Tegra I2C can use a gpio as an smbus-alert. Document the usage of
> the same.
> 
> Signed-off-by: Akhil R <akhilrajeev@xxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
> index 3f2f990..71ee79b 100644
> --- a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
> +++ b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
> @@ -70,6 +70,10 @@ Required properties:
>    - rx
>    - tx
>  
> +optional properties:
> +- smbalert-gpio: Must contain an entry for the gpio to be used as smbus alert.
> +  It will be used only if optional smbus-alert property is present.

There's already a standard way to do this with interrupts. And GPIOs can 
be interrupts usually.

> +
>  Example:
>  
>  	i2c@7000c000 {
> -- 
> 2.7.4
> 
>