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

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Date: Mon, 18 Mar 2024 13:48:31 +0000
From: Mark Brown <broonie@...nel.org>
To: Jan Dakinevich <jan.dakinevich@...utedevices.com>
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 Sun, Mar 17, 2024 at 07:27:14PM +0300, Jan Dakinevich wrote:

> 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?

Yes.

> >> +	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.

A supply is an on/off switch not an enum.  Users should not be selecting
values at all.

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