linux-kernel - Re: [PATCH v5 2/4] staging: iio: resolver: ad2s1210: clear faults after soft reset

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Message-ID: <20231012085926.2104251a@jic23-huawei>
Date:   Thu, 12 Oct 2023 08:59:26 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     David Lechner <dlechner@...libre.com>
Cc:     linux-iio@...r.kernel.org, linux-staging@...ts.linux.dev,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] staging: iio: resolver: ad2s1210: clear faults
 after soft reset

On Tue, 10 Oct 2023 16:12:34 -0500
David Lechner <dlechner@...libre.com> wrote:

> When a software reset is performed on the AD2S1210 to make the selected
> excitation frequency take effect, it always triggers faults on the
> input signals because the output signal is interrupted momentarily.
> So we need to clear the faults after the software reset to avoid
> triggering fault events the next time a sample is read.
> 
> The datasheet specifies a time t[track] in Table 27 that specifies the
> settle time in milliseconds after a reset depending on the selected
> resolution. This is used in the driver to add an appropriate delay.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
Applied