linux-kernel - Re: [PATCH 2/5] dt-bindings: i2c: nvidia,tegra20-i2c: Document Tegra264 I2C

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Message-ID: <s3jcfkbfffbvumolt7rewbxfysr6q5kcmgsywfhnfshgjumv3b@j4ft2l4ux33q>
Date: Wed, 8 Jan 2025 17:47:22 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Kartik Rajput <kkartik@...dia.com>
Cc: akhilrajeev@...dia.com, andi.shyti@...nel.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, jonathanh@...dia.com, ldewangan@...dia.com, 
	digetx@...il.com, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: i2c: nvidia,tegra20-i2c: Document
 Tegra264 I2C

On Wed, Jan 08, 2025 at 04:36:17PM +0530, Kartik Rajput wrote:
> Tegra264 has 17 generic I2C controllers, two of which are in always-on
> partition of the SoC. In addition to the features supported by Tegra194
> it also supports a MUTEX register to allow sharing the same I2C instance
> across multiple firmware.
> 
> Document compatible string "nvidia,tegra264-i2c" for Tegra264 I2C.
> 
> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
> ---
>  .../devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml         | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml
> index b57ae6963e62..2a016359328e 100644
> --- a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml
> @@ -80,6 +80,12 @@ properties:
>            support for 64 KiB transactions whereas earlier chips supported no
>            more than 4 KiB per transactions.
>          const: nvidia,tegra194-i2c
> +      - description: |
> +          Tegra264 has 17 generic I2C controllers, two of which are in the AON
> +          (always-on) partition of the SoC. In addition to the features from
> +          T194, a MUTEX register is added to support use of the same I2C

Maybe spell out Tegra194 above for consistency?

> +          instance across multiple firmware.

I don't know if this last sentence makes much sense in a DT bindings
document, but doesn't hurt either. Maybe s/firmware/firmwares/.

Thierry

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