linux-kernel - Re: [PATCH v4 09/11] ASoC: cs530x: Correct MCLK reference frequency values

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Message-ID: <a16503e6-870a-43ce-a705-27c0ea199303@sirena.org.uk>
Date: Fri, 17 Oct 2025 17:44:06 +0100
From: Mark Brown <broonie@...nel.org>
To: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>, Takashi Iwai <tiwai@...e.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	David Rhodes <david.rhodes@...rus.com>,
	Richard Fitzgerald <rf@...nsource.cirrus.com>,
	Liam Girdwood <lgirdwood@...il.com>, Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 09/11] ASoC: cs530x: Correct MCLK reference frequency
 values

On Fri, Oct 17, 2025 at 05:15:36PM +0100, Vitaly Rodionov wrote:
> The MCLK frequency must be 49.152 MHz (for 48 kHz-related
> sample rates) or 45.1584 MHz (for 44.1 kHz-related sample rates).

>  	switch (source) {
>  	case CS530X_SYSCLK_SRC_MCLK:
> -		if (freq != 24560000 && freq != 22572000) {
> -			dev_err(component->dev, "Invalid MCLK source rate %d\n",
> -				freq);
> +		switch (freq) {
> +		case CS530X_SYSCLK_REF_45_1MHZ:
> +		case CS530X_SYSCLK_REF_49_1MHZ:
> +			break;
> +		default:
> +			dev_err(component->dev, "Invalid MCLK source rate %d\n", freq);
>  			return -EINVAL;
>  		}
>  		break;

This will break any existing user that sets MCLK won't it?  Hopefully
they were managing to function, even if the clocks were out of spec.

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