linux-kernel - Re: [PATCH 0/3] iio: adc: Fix flags in sigma-delta drivers

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Message-ID: <20210803091741.8924-1-alexandru.tachici@analog.com>
Date:   Tue, 3 Aug 2021 12:17:41 +0300
From:   <alexandru.tachici@...log.com>
To:     <jic23@...nel.org>
CC:     <alexandru.tachici@...log.com>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] iio: adc: Fix flags in sigma-delta drivers

In Sigma-Delta devices the SDO line is also used as an interrupt.
Leaving IRQ on level instead of falling might trigger a sample read
when the IRQ is enabled, as the SDO line is already low. Not sure
if SDO line will always imediately go high in ad_sd_buffer_postenable
before the IRQ is enabled.

Also the datasheets seem to explicitly say the falling edge of the SDO
should be used as an interrupt.

-Alexandru