linux-kernel - Re: [RESEND PATCH v5 1/2] dt-bindings: i2c: pca954x: Add custom properties for MAX7357

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Message-ID: <ZYNTfKLFGrLq8qGY@shikoro>
Date: Wed, 20 Dec 2023 21:50:04 +0100
From: Wolfram Sang <wsa@...nel.org>
To: Naresh Solanki <naresh.solanki@...ements.com>,
	Rob Herring <robh+dt@...nel.org>
Cc: Peter Rosin <peda@...ntia.se>, Andi Shyti <andi.shyti@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Patrick Rudolph <patrick.rudolph@...ements.com>,
	Rob Herring <robh@...nel.org>, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v5 1/2] dt-bindings: i2c: pca954x: Add custom
 properties for MAX7357

On Wed, Dec 20, 2023 at 01:58:01PM +0530, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
> 
> Maxim Max7357 has a configuration register to enable additional
> features. These features aren't enabled by default & its up to
> board designer to enable the same as it may have unexpected side effects.
> 
> These should be validated for proper functioning & detection of devices
> in secondary bus as sometimes it can cause secondary bus being disabled.
> 
> Add booleans for:
>  - maxim,isolate-stuck-channel
>  - maxim,send-flush-out-sequence
>  - maxim,preconnection-wiggle-test-enable
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

Rob, are you really OK with these bindings? They look more like
configuration instead of HW description to me.

> ---
> Changes in V4:
> - Drop max7358.
> Changes in V3:
> - Update commit message
> Changes in V2:
> - Update properties.
> ---
>  .../bindings/i2c/i2c-mux-pca954x.yaml         | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> index 2d7bb998b0e9..9aa0585200c9 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> @@ -71,6 +71,23 @@ properties:
>      description: A voltage regulator supplying power to the chip. On PCA9846
>        the regulator supplies power to VDD2 (core logic) and optionally to VDD1.
>  
> +  maxim,isolate-stuck-channel:
> +    type: boolean
> +    description: Allows to use non faulty channels while a stuck channel is
> +      isolated from the upstream bus. If not set all channels are isolated from
> +      the upstream bus until the fault is cleared.
> +
> +  maxim,send-flush-out-sequence:
> +    type: boolean
> +    description: Send a flush-out sequence to stuck auxiliary buses
> +      automatically after a stuck channel is being detected.
> +
> +  maxim,preconnection-wiggle-test-enable:
> +    type: boolean
> +    description: Send a STOP condition to the auxiliary buses when the switch
> +      register activates a channel to detect a stuck high fault. On fault the
> +      channel is isolated from the upstream bus.
> +
>  required:
>    - compatible
>    - reg
> @@ -95,6 +112,19 @@ allOf:
>          "#interrupt-cells": false
>          interrupt-controller: false
>  
> +  - if:
> +      not:
> +        properties:
> +          compatible:
> +            contains:
> +              enum:
> +                - maxim,max7357
> +    then:
> +      properties:
> +        maxim,isolate-stuck-channel: false
> +        maxim,send-flush-out-sequence: false
> +        maxim,preconnection-wiggle-test-enable: false
> +
>  unevaluatedProperties: false
>  
>  examples:
> 
> base-commit: 76998e5bcdf155b36c7066808a0a65b2ee13cb2a
> -- 
> 2.41.0
> 
> 

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