linux-kernel - Re: [PATCH v7 6/6] ASoC: cs42l43: Add support for the cs42l43

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Date: Thu, 18 Jan 2024 18:11:09 +0000
From: Mark Brown <broonie@...nel.org>
To: andy.shevchenko@...il.com
Cc: Charles Keepax <ckeepax@...nsource.cirrus.com>, lee@...nel.org,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, linus.walleij@...aro.org, vkoul@...nel.org,
	lgirdwood@...il.com, yung-chuan.liao@...ux.intel.com,
	sanyog.r.kale@...el.com, pierre-louis.bossart@...ux.intel.com,
	alsa-devel@...a-project.org, patches@...nsource.cirrus.com,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 6/6] ASoC: cs42l43: Add support for the cs42l43

On Thu, Jan 18, 2024 at 07:41:54PM +0200, andy.shevchenko@...il.com wrote:
> Fri, Aug 04, 2023 at 11:46:02AM +0100, Charles Keepax kirjoitti:

> > +	unsigned int hs2 = 0x2 << CS42L43_HSDET_MODE_SHIFT;

> BIT(1) ?

Given that this is writing a value into a register field called "MODE"
it seems very likely that it's an enumeration value rather than a
bitmask (and similarly for all the other places where you're making
similar comments).  Please think a bit more about the code being
commented on when making these minor stylistic comments.

> > +static const char * const cs42l43_jack_text[] = {
> > +	"None", "CTIA", "OMTP", "Headphone", "Line-Out",
> > +	"Line-In", "Microphone", "Optical",

> Better to have this by power of 2 blocks (seems it's related to the possible
> values ranges in the HW).
> If it's just a coincidence that there are 8 of them, perhaps other (logical)
> grouping is better?

This is probably well within the realm of driver author taste...

> > +	// Don't use devm as we need to get against the MFD device

> This is weird...

This is normal, the splitting into subdevices is often a purely Linux
internal thing and not represented in the firmware description so
external resources are linked to the top level.

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