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SubjectRe: [PATCH 1/2] dt-bindings: i2c: tegra: Add SMBus feature properties
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@nvidia.com>
> ---
> 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
>
>

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