linux-kernel - Re: [PATCH] dt-bindings: i2c: Remove obsolete i2c.txt

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Date: Thu, 22 Feb 2024 20:55:29 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Rob Herring <robh@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andi Shyti <andi.shyti@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-i3c@...ts.infradead.org,
	linux-sound@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: i2c: Remove obsolete i2c.txt

On Thu, Feb 22, 2024 at 10:43:42AM -0700, Rob Herring wrote:
> Everything in i2c.txt is covered by schemas/i2c/i2c-controller.yaml in
> dtschema project, so remove i2c.txt and update links to it in the tree.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>

Differences to i2c.txt:

* In the schema, "clock-frequency" has a minimum of 1kHz and a maximum
  of 3MHz. Why? The specs do not say anything about a minimum freq and
  fastest speed mentioned in the docs is 5Mhz (Ultra fast mode).

* new binding "i2c-scl-clk-low-timeout-us" has a description which I do
  not understand. What is a waiting state?

* new binding "no-detect" is broken. At the least, it should be named
  something like "bus-fully-described" and then the OS can decide to
  leave out auto-detection mechanisms. If you are interested in the
  latter, you can simply disable class based instantiation on the host
  controller. No need to describe this in DT.

> Wolfram, you can take it or I can.

Once we are done, I guess it is better if you take it.

Thanks for the work,

   Wolfram

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