linux-kernel - Re: [PATCH V2 2/2] ASoC: max98388: add amplifier driver

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Message-ID: <87d90ade-644c-a45d-ce50-bdeded755b04@linaro.org>
Date:   Sat, 10 Jun 2023 11:24:28 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     “Ryan <ryan.lee.analog@...il.com>,
        lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, perex@...ex.cz, tiwai@...e.com,
        rf@...nsource.cirrus.com, ryans.lee@...log.com,
        wangweidong.a@...nic.com, shumingf@...ltek.com,
        herve.codina@...tlin.com, ckeepax@...nsource.cirrus.com,
        doug@...morgal.com, ajye_huang@...pal.corp-partner.google.com,
        kiseok.jo@...ndevice.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     venkataprasad.potturu@....com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH V2 2/2] ASoC: max98388: add amplifier driver

On 10/06/2023 01:44, “Ryan wrote:
> From: Ryan Lee <ryans.lee@...log.com>
> 
> Added Analog Devices MAX98388 amplifier driver.
> MAX98388 provides a PCM interface for audio data and a standard I2C
> interface for control data communication.
> 
> Signed-off-by: Ryan Lee <ryans.lee@...log.com>
> Reported-by: kernel test robot <lkp@...el.com>

There is nothing to report here.

> Closes: 
> https://urldefense.com/v3/__https://lore.kernel.org/oe-kbuild-all/2023
> 06082054.jIU9oENf-lkp@...el.com/__;!!A3Ni8CS0y2Y!46sHiAsmIiXxZ_QXIobho
> mY8F1f7F2yMYd_65NNFwRlcgut33--RdFjVAbg6jKf7Vs8GaYZ7oA$

Nothing to close and also broken link. Fix your mailer.

> ---
> Changes from v1:
>   Fixed build warnings.
> 
>  sound/soc/codecs/Kconfig    |   10 +
>  sound/soc/codecs/Makefile   |    2 +
>  sound/soc/codecs/max98388.c | 1042 +++++++++++++++++++++++++++++++++++
>  sound/soc/codecs/max98388.h |  234 ++++++++
>  4 files changed, 1288 insertions(+)
>  create mode 100644 sound/soc/codecs/max98388.c
>  create mode 100644 sound/soc/codecs/max98388.h

...

> +
> +static void max98388_read_deveice_property(struct device *dev,
> +					   struct max98388_priv *max98388)
> +{
> +	int value;
> +
> +	if (!device_property_read_u32(dev, "adi,vmon-slot-no", &value))
> +		max98388->v_slot = value & 0xF;
> +	else
> +		max98388->v_slot = 0;
> +
> +	if (!device_property_read_u32(dev, "adi,imon-slot-no", &value))
> +		max98388->i_slot = value & 0xF;
> +	else
> +		max98388->i_slot = 1;
> +
> +	if (device_property_read_bool(dev, "adi,interleave-mode"))
> +		max98388->interleave_mode = true;
> +	else
> +		max98388->interleave_mode = false;
> +
> +	if (dev->of_node) {
> +		max98388->reset_gpio = of_get_named_gpio(dev->of_node,
> +							 "reset-gpio", 0);

Nope, use devm

> +		if (!gpio_is_valid(max98388->reset_gpio)) {
> +			dev_err(dev, "Looking up %s property in node %s failed %d\n",
> +				"reset-gpio", dev->of_node->full_name,
> +				max98388->reset_gpio);
> +		} else {
> +			dev_dbg(dev, "reset-gpio=%d",
> +				max98388->reset_gpio);
> +		}
> +	} else {
> +		/* this makes reset_gpio as invalid */
> +		max98388->reset_gpio = -1;

Why? To request it again? It does not make sense.

> +	}
> +}
> +
> +static int max98388_i2c_probe(struct i2c_client *i2c)
> +{
> +	int ret = 0;
> +	int reg = 0;
> +
> +	struct max98388_priv *max98388 = NULL;
> +
> +	max98388 = devm_kzalloc(&i2c->dev, sizeof(*max98388), GFP_KERNEL);
> +

Drop blank line.

> +	if (!max98388) {
> +		ret = -ENOMEM;

return -ENOMEM;

> +		return ret;
> +	}
> +	i2c_set_clientdata(i2c, max98388);
> +
> +	/* regmap initialization */
> +	max98388->regmap = devm_regmap_init_i2c(i2c, &max98388_regmap);
> +	if (IS_ERR(max98388->regmap)) {
> +		ret = PTR_ERR(max98388->regmap);
> +		dev_err(&i2c->dev,
> +			"Failed to allocate regmap: %d\n", ret);
> +		return ret;

return dev_err_probe

> +	}
> +
> +	/* voltage/current slot & gpio configuration */
> +	max98388_read_deveice_property(&i2c->dev, max98388);
> +
> +	/* Power on device */
> +	if (gpio_is_valid(max98388->reset_gpio)) {

What's this? You request it twice? No.


> +		ret = devm_gpio_request(&i2c->dev, max98388->reset_gpio,
> +					"MAX98388_RESET");
> +		if (ret) {
> +			dev_err(&i2c->dev, "%s: Failed to request gpio %d\n",
> +				__func__, max98388->reset_gpio);

return dev_err_probe

> +			return -EINVAL;
> +		}
> +		gpio_direction_output(max98388->reset_gpio, 0);
> +		msleep(50);
> +		gpio_direction_output(max98388->reset_gpio, 1);

1 means keep in reset, so why do you keep deviec reset afterwards? Was
it tested? You probably messed up values used for GPIOs as you stated in
example that it is active low.

> +		msleep(20);
> +	}
> +
> +	/* Read Revision ID */
> +	ret = regmap_read(max98388->regmap,
> +			  MAX98388_R22FF_REV_ID, &reg);
> +	if (ret < 0) {
> +		dev_err(&i2c->dev,
> +			"Failed to read: 0x%02X\n", MAX98388_R22FF_REV_ID);
> +		return ret;

return dev_err_probe

> +	}
> +	dev_info(&i2c->dev, "MAX98388 revisionID: 0x%02X\n", reg);
> +
> +	/* codec registration */
> +	ret = devm_snd_soc_register_component(&i2c->dev,
> +					      &soc_codec_dev_max98388,
> +					      max98388_dai,
> +					      ARRAY_SIZE(max98388_dai));
> +	if (ret < 0)
> +		dev_err(&i2c->dev, "Failed to register codec: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static const struct i2c_device_id max98388_i2c_id[] = {
> +	{ "max98388", 0},
> +	{ },
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, max98388_i2c_id);
> +
> +#if defined(CONFIG_OF)

Drop

> +static const struct of_device_id max98388_of_match[] = {
> +	{ .compatible = "adi,max98388", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, max98388_of_match);
> +#endif
> +
> +#ifdef CONFIG_ACPI

Drop

> +static const struct acpi_device_id max98388_acpi_match[] = {
> +	{ "ADS8388", 0 },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(acpi, max98388_acpi_match);
> +#endif
> +
> +static struct i2c_driver max98388_i2c_driver = {
> +	.driver = {
> +		.name = "max98388",
> +		.of_match_table = of_match_ptr(max98388_of_match),
> +		.acpi_match_table = ACPI_PTR(max98388_acpi_match),

Just drop all wrappers. They are useless and only limit your driver (OF
can be used on some ACPI platforms).


Best regards,
Krzysztof