linux-kernel - Re: [PATCH v2] ASoC: codecs: wsa884x: Implement temperature reading and hwmon

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Message-ID: <36840696-772b-4e57-a672-ec5210ebeb64@linaro.org>
Date: Sun, 14 Jul 2024 12:21:28 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Banajit Goswami <bgoswami@...cinc.com>, Jean Delvare <jdelvare@...e.com>,
 Guenter Roeck <linux@...ck-us.net>, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
 linux-arm-msm@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v2] ASoC: codecs: wsa884x: Implement temperature reading
 and hwmon

On 14/07/2024 12:02, Krzysztof Kozlowski wrote:
> On 13/07/2024 11:56, Krzysztof Kozlowski wrote:
>> Read temperature of the speaker and expose it via hwmon interface, which
>> will be later used during calibration of speaker protection algorithms.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> ---
>>
>> Changes in v2:
>> 1. Add missing dependency on HWMON for y!=m builds (kernel test robot
>>    report: undefined reference to
>>    `devm_hwmon_device_register_with_info').
>> ---
>>  sound/soc/codecs/Kconfig   |   1 +
>>  sound/soc/codecs/wsa884x.c | 197 +++++++++++++++++++++++++++++++++++++
>>  2 files changed, 198 insertions(+)
>>
>> diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
>> index 97bb69c9848d..09a0b209bc2f 100644
>> --- a/sound/soc/codecs/Kconfig
>> +++ b/sound/soc/codecs/Kconfig
>> @@ -2447,6 +2447,7 @@ config SND_SOC_WSA883X
>>  config SND_SOC_WSA884X
>>  	tristate "WSA884X Codec"
>>  	depends on SOUNDWIRE
>> +	depends on HWMON || !HWMON
> 
> Eh, now I got build report that hwmon does not have stubs for !HWMON (by
> design or missing?), so this still has compile failures.
> 
> I think we should have (devm_)hwmon_device_register_with_info() stubs
> for drivers not depending on hwmon, so I will propose a patch for that.
> If that approach is accepted, no changes should be needed in this
> wsa884x v2 patchset.

Answering to myself: I see now that lack of !HWMON stubs for providers
is rather by design and drivers use IS_REACHABLE. I'll send a v3 of this
patch.

Best regards,
Krzysztof