From: Conor Dooley <conor@kernel.org>
To: "Wojciech Siudy (Nokia)" <wojciech.siudy@nokia.com>
Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Peter Rosin <peda@axentia.se>, Andi Shyti <andi.shyti@kernel.org>,
"laurent.pinchart@ideasonboard.com"
<laurent.pinchart@ideasonboard.com>
Subject: Re: [PATCH v4 0/2] pca954x: Add DT bindings and driver changes for reset after timeout
Date: Fri, 13 Sep 2024 18:53:41 +0100 [thread overview]
Message-ID: <20240913-retaining-require-59ff15d696e9@spud> (raw)
In-Reply-To: <DB6PR07MB3509B9378807A7968E272D959D652@DB6PR07MB3509.eurprd07.prod.outlook.com>
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On Fri, Sep 13, 2024 at 10:36:43AM +0000, Wojciech Siudy (Nokia) wrote:
> From: Wojciech Siudy <wojciech.siudy@nokia.com>
>
> The pca954x mux might not respond under certain cicumstances, like device behind
> it holding SDA after recovery loop or some internal issue in mux itself. Those
> situations are indicated by ETIMEDOUT returned from I2C transaction attempting
> selecting or deselecting the channel. According to device documentation the
> reset pulse restores I2C subsystem of the mux and deselects the channel.
>
> Since the mux switches using transistors, the failure of line behind mux that
> is currently conneted prevents sending commands to mux itself, so external reset
> signal is required.
>
> The following series of patches implements the reset functionality if it was
> selected in devicetree, beceuse the reset line might not be dedivated in some
> applications and such reset pulse would break other chips.
FYI, something went a bit wrong with this series, and it has not been
threaded correctly. How did you send it?
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prev parent reply other threads:[~2024-09-13 17:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-13 10:36 [PATCH v4 0/2] pca954x: Add DT bindings and driver changes for reset after timeout Wojciech Siudy (Nokia)
2024-09-13 17:53 ` Conor Dooley [this message]
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