linux-kernel - Re: [PATCH 5/5] ASoC: codecs: Add WCD939x Codec driver

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Message-ID: <42a6f6e0-2846-4cdc-8702-493fadbafb98@linaro.org>
Date:   Tue, 28 Nov 2023 16:01:59 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] ASoC: codecs: Add WCD939x Codec driver

On 25/11/2023 13:07, Konrad Dybcio wrote:

<snip>

>> +
>> +static int wcd939x_io_init(struct snd_soc_component *component)
>> +{
>> +	snd_soc_component_write_field(component, WCD939X_ANA_BIAS,
>> +				      WCD939X_BIAS_ANALOG_BIAS_EN, 1);
> All of these values are BIT()s or 2-4 ORed BIT()s, can you check what they
> mean?
> 
> Same for almost all other snd_soc_component_ write/modify functions

It uses snd_soc_component_write_field() with is the same as
regmap_write_bits(REGISTER, REGISTER_MASK,
                   FIELD_PREP(REGISTER_MASK, value);

So the 1 mean write in enable mask in this case, and mask is single bit,
read it exactly like if it was using FIELD_PREP(), but even for BITs.

I did check every single snd_soc_component_write_field() so far to check
it matches.

Or it's another question ?

Neil

> 
> [...]
> 

<snip>

> 
> 
> Konrad