linux-kernel - Re: [PATCH 2/2] ASoC: codecs: ad193x: Reset DAC Control 1 register at probe

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Message-ID: <20190626112331.GB5316@sirena.org.uk>
Date:   Wed, 26 Jun 2019 12:23:31 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        lars@...afoo.de, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com
Subject: Re: [PATCH 2/2] ASoC: codecs: ad193x: Reset DAC Control 1 register
 at probe

On Wed, Jun 26, 2019 at 01:49:47PM +0300, Codrin Ciubotariu wrote:
> Since the ad193x codecs have no software reset, we have to reinitialize the
> registers after a hardware reset. For example, if we change the
> device-tree between these resets, changing the audio format of the DAI link
> from DSP_A with 8 TDM channels to I2S 2 channels, DAC Control 1 register
> will remain configured for 8 channels. This patch resets this register at
> probe to its default value.

Would it not be more robust/complete to have a set of register defaults
and write the whole lot out rather than individually going through and
adding writes for specific registers as needed?

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