linux-kernel - Re: [PATCH v1 2/2] ASoC: starfive: Add PDM controller support

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Date: Thu, 7 Mar 2024 12:52:10 +0000
From: Mark Brown <broonie@...nel.org>
To: Xingyu Wu <xingyu.wu@...rfivetech.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Takashi Iwai <tiwai@...e.com>,
	Jaroslav Kysela <perex@...ex.cz>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Walker Chen <walker.chen@...rfivetech.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH v1 2/2] ASoC: starfive: Add PDM controller support

On Thu, Mar 07, 2024 at 11:37:08AM +0800, Xingyu Wu wrote:

> +static const struct snd_kcontrol_new jh8100_pdm_snd_controls[] = {
> +	SOC_SINGLE("DC compensation Control", JH8100_PDM_DMIC_CTRL0, 30, 1, 0),
> +	SOC_SINGLE("High Pass Filter Control", JH8100_PDM_DMIC_CTRL0, 28, 1, 0),
> +	SOC_SINGLE("Left Channel Volume Control", JH8100_PDM_DMIC_CTRL0, 23, 1, 0),
> +	SOC_SINGLE("Right Channel Volume Control", JH8100_PDM_DMIC_CTRL0, 22, 1, 0),
> +	SOC_SINGLE_TLV("Volume", JH8100_PDM_DMIC_CTRL0, 16, 0x3F, 1, volume_tlv),
> +	SOC_SINGLE("Data MSB Shift", JH8100_PDM_DMIC_CTRL0, 1, 7, 0),
> +	SOC_SINGLE("SCALE", JH8100_PDM_DC_SCALE0, 0, 0x3F, 0),
> +	SOC_SINGLE("DC offset", JH8100_PDM_DC_SCALE0, 8, 0xFFFFF, 0),
> +};

Simple on/off switches should have names ending in Switch, volumes
should end in Volume as per control-names.rst.  Please for the next
version you post show the output of running mixer-test on a system with
this device, it will identify these and other issues.

> +static int jh8100_pdm_component_probe(struct snd_soc_component *component)
> +{
> +	struct jh8100_pdm_priv *priv = snd_soc_component_get_drvdata(component);
> +
> +	snd_soc_component_init_regmap(component, priv->regmap);
> +	snd_soc_add_component_controls(component, jh8100_pdm_snd_controls,
> +				       ARRAY_SIZE(jh8100_pdm_snd_controls));

You can just specify the controls in the snd_soc_compoenent_driver.

> +#ifdef CONFIG_PM
> +static int jh8100_pdm_runtime_suspend(struct device *dev)
> +{
> +	struct jh8100_pdm_priv *priv = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(priv->icg_clk);
> +	return 0;
> +}
> +
> +static int jh8100_pdm_runtime_resume(struct device *dev)
> +{
> +	struct jh8100_pdm_priv *priv = dev_get_drvdata(dev);
> +
> +	return jh8100_pdm_crg_enable(priv);
> +}
> +#endif

It's weird that the runtime suspend and resume are not symmetric - why
do we need to bring the device out of reset but not put it into reset?

> +	if (!device_property_read_u8(&pdev->dev, "starfive,pdm-modulex", &using_modulex))
> +		if (using_modulex == 1)
> +			base += JH8100_PDM_MODULEX_SHIFT; /* Use module 1 */

This really looks like you've got one hardware block with two devices in
it, either the address ranges registered for the devices in DT should be
separate and you shouldn't need this property or you should have one
component registering both PDM interfaces.

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