linux-kernel - Re: [PATCH 1/2] dt-bindings: i2c: designware: allow fine tuning tuning waveform from device tree

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Date: Thu, 1 Feb 2024 08:33:48 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Aahil Awatramani <aahila@...gle.com>, David Dillow <dillow@...gle.com>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Jan Dabros <jsd@...ihalf.com>, linux-i2c@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: i2c: designware: allow fine tuning
 tuning waveform from device tree

On 01/02/2024 05:46, Aahil Awatramani wrote:
> The Synopsys i2c driver allows a user to override the parameters

Driver? That already suggests it is not suitable for binding...

> controlling the waveform using ACPI; this is useful for fine tuning when
> needed to make spec compliance. Extend this support to the device tree to
> allow non-ACPI platforms the same capabilities.
> 
> Signed-off-by: Aahil Awatramani <aahila@...gle.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c.txt | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
> index fc3dd7ec0445..3c33c36571f9 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c.txt
> @@ -45,6 +45,24 @@ wants to support one of the below features, it should adapt these bindings.
>  	Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
>  	specification.
>  
> +- i2c-scl-ss-hcnt
> +	HCNT value for standard speed mode in I2C Controller.

I have no clue what is HCNT, so I expect you to help us understand what
is this and why this is suitable for DT. Your reference to driver
suggests it is not suitable for DT.

Best regards,
Krzysztof