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

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Message-ID: <eaa034cb-06e8-4204-befa-4389bcb7d9e8@linaro.org>
Date:   Wed, 29 Nov 2023 14:46:04 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     neil.armstrong@...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 28.11.2023 16:01, Neil Armstrong wrote:
> 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 ?
What I wanted to ask is whether it's possible to #define these magic
values within these fields

Konrad