linux-kernel - Re: [PATCH 12/25] ASoC: meson: t9015: add support for A1 SoC family

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Date: Sun, 17 Mar 2024 19:27:14 +0300
From: Jan Dakinevich <jan.dakinevich@...utedevices.com>
To: Mark Brown <broonie@...nel.org>
CC: Neil Armstrong <neil.armstrong@...aro.org>, Jerome Brunet
	<jbrunet@...libre.com>, Michael Turquette <mturquette@...libre.com>, Stephen
 Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>, Kevin Hilman <khilman@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>, Liam Girdwood
	<lgirdwood@...il.com>, Linus Walleij <linus.walleij@...aro.org>, Jaroslav
 Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	<linux-amlogic@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <alsa-devel@...a-project.org>,
	<linux-sound@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
	<kernel@...utedevices.com>
Subject: Re: [PATCH 12/25] ASoC: meson: t9015: add support for A1 SoC family



On 3/15/24 16:36, Mark Brown wrote:
> On Fri, Mar 15, 2024 at 02:21:48AM +0300, Jan Dakinevich wrote:
> 
>> +static const char * const a1_adc_mic_bias_level_txt[] = { "2.0V", "2.1V",
>> +	"2.3V", "2.5V", "2.8V" };
>> +static const unsigned int a1_adc_mic_bias_level_values[] = { 0, 1, 2, 3, 7 };
> 
> Why would this be varied at runtime rather than being something fixed
> when the system is designed?
> 
>> +static const char * const a1_adc_pga_txt[] = { "None", "Differential",
>> +	"Positive", "Negative" };
>> +static const unsigned int a1_adc_pga_right_values[] = { 0, PGAR_DIFF,
>> +	PGAR_POSITIVE, PGAR_NEGATIVE };
>> +static const unsigned int a1_adc_pga_left_values[] = { 0, PGAL_DIFF,
>> +	PGAL_POSITIVE, PGAL_NEGATIVE };
> 
> Similarly here.
> 

Both mic bias and ADC's input mode depends on schematics and should be
configurable. What is the better way to give access to these parameters?
Device tree?

>> +	SOC_SINGLE("ADC Mic Bias Switch", LINEIN_CFG, MICBIAS_EN, 1, 0),
>> +	SOC_ENUM("ADC Mic Bias Level", a1_adc_mic_bias_level),
> 
> Why would micbias be user controlled rather than a DAPM widget as
> normal?

Yes, I could use SND_SOC_DAPM_SUPPLY, but it supports only raw values,
and doesn't supports enums. Here, I want to use enum to restrict
possible values, because only these values mentioned in the
documentation that I have.

-- 
Best regards
Jan Dakinevich