linux-kernel - Re: [PATCH v3 3/3] i2c: mux: gpio: Add support for the 'settle-time-us' property

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Message-ID: <8b723ef0-a75e-d324-6beb-0f4e5a5fbaf3@axentia.se>
Date: Wed, 10 Jul 2024 10:02:56 +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 v3 3/3] i2c: mux: gpio: Add support for the
 'settle-time-us' property

2024-06-17 at 14:08, Bastien Curutchet wrote:
> Some hardware need some time to switch from a bus to another. This can
> cause the first transfers following the selection of a bus to fail.
> There is no way to configure this kind of waiting time in the driver.
> 
> Add support for the 'settle-time-us' device-tree property. When set,
> the i2c_mux_gpio_select() applies a delay before returning, leaving
> enough time to the hardware to switch to the new bus.
> 
> Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>

Acked-by: Peter Rosin <peda@...ntia.se>

Cheers,
Peter