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

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Date: Fri, 23 Feb 2024 23:34:19 +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

Hi Rob,

> > * 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).
> 
> IIRC, the high speed mode originally topped out at 3MHz. I guess
> that's been revised.

Hs-mode has a max of 3.4MHz...

> 
> We can drop the minimum.

... but I see you changed min/max now to 1/5000000. That's what I would
have suggested as well.


> > * new binding "i2c-scl-clk-low-timeout-us" has a description which I do
> >   not understand. What is a waiting state?
> 
> Shrug. May have to look at the MPC h/w that uses the property.

I will also have another look. My gut feeling is that the binding is
okay, only the description might need an update.

> >
> > * 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.
> 
> I've reverted the property now.

Cool, thanks!

Kind regards,

   Wolfram


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