From: Rob Herring <robh@kernel.org>
To: Peter Rosin <peda@axentia.se>
Cc: Bastien Curutchet <bastien.curutchet@bootlin.com>,
Andi Shyti <andi.shyti@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Peter Korsgaard <peter.korsgaard@barco.com>,
Wolfram Sang <wsa@kernel.org>,
linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Herve Codina <herve.codina@bootlin.com>,
Christopher Cordahi <christophercordahi@nanometrics.ca>
Subject: Re: [PATCH v2 1/3] dt-bindings: i2c: gpio: Add 'transition-delay-us' property
Date: Mon, 3 Jun 2024 10:58:10 -0500 [thread overview]
Message-ID: <20240603155810.GA509311-robh@kernel.org> (raw)
In-Reply-To: <718d86a7-d70a-c38a-089d-5276bcc6e88b@axentia.se>
On Wed, May 29, 2024 at 02:13:37PM +0200, Peter Rosin wrote:
> 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
Agreed. I knew we had something and went looking... I only checked the
base mux and i2c mux bindings.
Rob
next prev parent reply other threads:[~2024-06-03 15:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-29 9:17 [PATCH v2 0/3] i2c: mux: gpio: Add 'transition-delay-us' property Bastien Curutchet
2024-05-29 9:17 ` [PATCH v2 1/3] dt-bindings: i2c: " Bastien Curutchet
2024-05-29 12:13 ` Peter Rosin
2024-06-03 15:58 ` Rob Herring [this message]
2024-06-05 12:32 ` Bastien Curutchet
2024-05-29 9:17 ` [PATCH v2 2/3] i2c: mux: gpio: Re-order #include to match alphabetic order Bastien Curutchet
2024-05-29 9:17 ` [PATCH v2 3/3] i2c: mux: gpio: Add support for the 'transition-delay-us' property Bastien Curutchet
2024-05-29 12:16 ` Peter Rosin
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