linux-kernel - Re: [PATCH v2 1/3] dt-bindings: i2c: gpio: Add 'transition-delay-us' property

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Message-ID: <718d86a7-d70a-c38a-089d-5276bcc6e88b@axentia.se>
Date: Wed, 29 May 2024 14:13:37 +0200
From: Peter Rosin <peda@...ntia.se>
To: Bastien Curutchet <bastien.curutchet@...tlin.com>,
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Peter Korsgaard <peter.korsgaard@...co.com>,
 Wolfram Sang <wsa@...nel.org>
Cc: linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, Herve Codina <herve.codina@...tlin.com>,
 Christopher Cordahi <christophercordahi@...ometrics.ca>
Subject: Re: [PATCH v2 1/3] dt-bindings: i2c: gpio: Add 'transition-delay-us'
 property

Hi!

2024-05-29 at 11:17, Bastien Curutchet wrote:
> I2C MUXes described by the i2c-gpio-mux sometimes need a significant
> amount of time to switch from a bus to another. When a new bus is
> selected, the first I2C transfer can fail if it occurs too early. There
> is no way to describe this transition delay that has to be waited before
> starting the first I2C transfer.
> 
> Add a 'transition-delay-us' property that indicates the delay to be
> respected before doing the first i2c transfer.

The io-channel-mux has a property with very similar intent named
settle-time-us [1]. I think we should use the same name here.

[1] Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml

Cheers,
Peter