linux-kernel - Re: [PATCH 2/3] ASoC: codecs: Add support for the Infineon PEB2466 codec

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Date:   Tue, 7 Feb 2023 22:17:39 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/3] ASoC: codecs: Add support for the Infineon PEB2466
 codec

Le 06/02/2023 à 15:49, Herve Codina a écrit :
> The Infineon PEB2466 codec is a programmable DSP-based four channels
> codec with filters capabilities.
> It also provides signals as GPIOs.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> ---
>   sound/soc/codecs/Kconfig   |   12 +
>   sound/soc/codecs/Makefile  |    2 +
>   sound/soc/codecs/peb2466.c | 2071 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 2085 insertions(+)
>   create mode 100644 sound/soc/codecs/peb2466.c
> 

[...]

> +static int peb2466_spi_probe(struct spi_device *spi)
> +{
> +	struct peb2466 *peb2466;
> +	unsigned long mclk_rate;
> +	int ret;
> +	u8 xr5;
> +
> +	spi->bits_per_word = 8;
> +	ret = spi_setup(spi);
> +	if (ret < 0)
> +		return ret;
> +
> +	peb2466 = devm_kzalloc(&spi->dev, sizeof(*peb2466), GFP_KERNEL);
> +	if (!peb2466)
> +		return -ENOMEM;
> +
> +	peb2466->spi = spi;
> +
> +	peb2466->regmap = devm_regmap_init(&peb2466->spi->dev, NULL, peb2466,
> +					   &peb2466_regmap_config);
> +	if (IS_ERR(peb2466->regmap))
> +		return PTR_ERR(peb2466->regmap);
> +
> +	peb2466->reset_gpio = devm_gpiod_get_optional(&peb2466->spi->dev,
> +						      "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(peb2466->reset_gpio))
> +		return PTR_ERR(peb2466->reset_gpio);
> +
> +	peb2466->mclk = devm_clk_get(&peb2466->spi->dev, "mclk");

Hi,

Up to you to decide if it is a good idea or not, but using 
devm_clk_get_enabled() would save the 'mclk' field in peb2466 ...

> +	if (IS_ERR(peb2466->mclk))
> +		return PTR_ERR(peb2466->mclk);
> +	ret = clk_prepare_enable(peb2466->mclk);
> +	if (ret)
> +		return ret;

... these 3 lines ...

> +
> +	if (peb2466->reset_gpio) {
> +		gpiod_set_value_cansleep(peb2466->reset_gpio, 1);
> +		udelay(4);
> +		gpiod_set_value_cansleep(peb2466->reset_gpio, 0);
> +		udelay(4);
> +	}
> +
> +	spi_set_drvdata(spi, peb2466);

... this spi_set_drvdata() call ...

> +
> +	mclk_rate = clk_get_rate(peb2466->mclk);
> +	switch (mclk_rate) {
> +	case 1536000:
> +		xr5 = PEB2466_XR5_MCLK_1536;
> +		break;
> +	case 2048000:
> +		xr5 = PEB2466_XR5_MCLK_2048;
> +		break;
> +	case 4096000:
> +		xr5 = PEB2466_XR5_MCLK_4096;
> +		break;
> +	case 8192000:
> +		xr5 = PEB2466_XR5_MCLK_8192;
> +		break;
> +	default:
> +		dev_err(&peb2466->spi->dev, "Unsupported clock rate %lu\n",
> +			mclk_rate);
> +		ret = -EINVAL;
> +		goto failed;
> +	}
> +	ret = regmap_write(peb2466->regmap, PEB2466_XR5, xr5);
> +	if (ret) {
> +		dev_err(&peb2466->spi->dev, "Setting MCLK failed (%d)\n", ret);
> +		goto failed;
> +	}
> +
> +	ret = devm_snd_soc_register_component(&spi->dev, &peb2466_component_driver,
> +					      &peb2466_dai_driver, 1);
> +	if (ret)
> +		goto failed;
> +
> +	if (IS_ENABLED(CONFIG_GPIOLIB)) {
> +		ret = peb2466_gpio_init(peb2466);
> +		if (ret)
> +			goto failed;
> +	}
> +
> +	return 0;
> +
> +failed:
> +	clk_disable_unprepare(peb2466->mclk);
> +	return ret;

... this error handling path ...

> +}
> +
> +static void peb2466_spi_remove(struct spi_device *spi)
> +{
> +	struct peb2466 *peb2466 = spi_get_drvdata(spi);
> +
> +	clk_disable_unprepare(peb2466->mclk);
> +}

... and the remove function.

CJ


> +
> +static const struct of_device_id peb2466_of_match[] = {
> +	{ .compatible = "infineon,peb2466", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, peb2466_of_match);
> +
> +static const struct spi_device_id peb2466_id_table[] = {
> +	{ "peb2466", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(spi, peb2466_id_table);
> +
> +static struct spi_driver peb2466_spi_driver = {
> +	.driver  = {
> +		.name   = "peb2466",
> +		.of_match_table = peb2466_of_match,
> +	},
> +	.id_table = peb2466_id_table,
> +	.probe  = peb2466_spi_probe,
> +	.remove = peb2466_spi_remove,
> +};
> +
> +module_spi_driver(peb2466_spi_driver);
> +
> +MODULE_AUTHOR("Herve Codina <herve.codina@...tlin.com>");
> +MODULE_DESCRIPTION("PEB2466 ALSA SoC driver");
> +MODULE_LICENSE("GPL");