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

Message ID 1639062321-18840-2-git-send-email-akhilrajeev@nvidia.com
State New
Headers show
Series Add SMBus features to Tegra I2C | expand

Commit Message

Akhil R Dec. 9, 2021, 3:05 p.m. UTC
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(+)

Comments

Rob Herring Dec. 15, 2021, 6:37 p.m. UTC | #1
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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Patch

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.
+
 Example:
 
 	i2c@7000c000 {