From: Wolfram Sang <wsa@kernel.org>
To: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: andriy.shevchenko@linux.intel.com,
Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] i2c: algo-pca: Add 0x78 as SCL stuck low status
Date: Sat, 4 Jul 2020 08:03:59 +0200 [thread overview]
Message-ID: <20200704060359.GA1041@kunai> (raw)
In-Reply-To: <20200701223912.30864-1-chris.packham@alliedtelesis.co.nz>
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On Thu, Jul 02, 2020 at 10:39:11AM +1200, Chris Packham wrote:
> The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
> low, this differs to the PCA9564 which uses 90h for this indication.
> Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.
>
> Based on looking through the PCA9564 and PCA9665 datasheets this should
> be safe for both chips. The PCA9564 should not return 0x78 for any valid
> state and the PCA9665 should not return 0x90.
>
> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Applied to for-current, thanks!
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prev parent reply other threads:[~2020-07-04 6:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-01 22:39 [PATCH v2] i2c: algo-pca: Add 0x78 as SCL stuck low status Chris Packham
2020-07-02 10:04 ` Andy Shevchenko
2020-07-04 6:03 ` Wolfram Sang [this message]
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