linux-kernel - Re: [PATCH v2 09/19] staging: iio: resolver: ad2s1210: use regmap for config registers

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Date:   Mon, 25 Sep 2023 11:37:08 -0500
From:   David Lechner <dlechner@...libre.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>
Subject: Re: [PATCH v2 09/19] staging: iio: resolver: ad2s1210: use regmap for
 config registers

> > -     if (ret & AD2S1210_MSB_IS_HIGH) {
> I guess this was meant to be a sanity check on the chip responding.
>
> > -             ret = -EIO;
> > -             goto error_ret;
> > -     }
> > -

Yes, according to the data sheet, if this bit is set, it means there was a
configuration parity error. This test has been moved to the
ad2s1210_regmap_reg_read() function.