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

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Date:   Wed, 29 Nov 2023 19:21:51 +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 29.11.2023 16:12, neil.armstrong@...aro.org wrote:
> On 29/11/2023 14:46, Konrad Dybcio wrote:
>> 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
> 
> OK, so most of writes are to boolean enable bits, I can use true/false
> instead of 0 & 1 for those, would it be more readable ?
Yes, I think that would convey their meaning quite well

> 
> For the rest, those a integer values to a field, those are not bitmasks
> and I do not have the definition of the values.
> 
> I did a full cleanup and tried to define as much as possible,
> there were still lot of places where not defined bitmasks we used,
> but there's still some integer values, but I think it's acceptable.
No worries, what you say already sounds very cool!

Konrad