linux-kernel - Re: [PATCH 1/3] ASoC: mediatek: Add AFE platform driver

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Date:	Thu, 11 Jun 2015 09:03:07 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Koro Chen <koro.chen@...iatek.com>
Cc:	robh+dt@...nel.org, matthias.bgg@...il.com, broonie@...nel.org,
	perex@...ex.cz, tiwai@...e.de, srv_heupstream@...iatek.com,
	linux-mediatek@...ts.infradead.org, s.hauer@...gutronix.de,
	galak@...eaurora.org, lgirdwood@...il.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 1/3] ASoC: mediatek: Add AFE platform driver

On Wed, 2015-06-10 at 22:24 +0800, Koro Chen wrote:
> --- /dev/null
> +++ b/sound/soc/mediatek/Kconfig

> +config SND_SOC_MEDIATEK
> +	bool "ASoC support for Mediatek chip"
> +	depends on ARCH_MEDIATEK
> +	help
> +	  This adds ASoC platform driver support for Mediatek chip
> +	  that can be used with other codecs.
> +	  Select Y if you have such device.
> +	  Ex: MT8173

> --- /dev/null
> +++ b/sound/soc/mediatek/Makefile

> +obj-$(CONFIG_SND_SOC_MEDIATEK) += mtk-afe-pcm.o

> --- /dev/null
> +++ b/sound/soc/mediatek/mtk-afe-pcm.c

> +#include <linux/module.h>

> +static void mtk_afe_set_i2s_enable(struct mtk_afe *afe, bool enable)
> +{
> +	unsigned int val;
> +
> +	regmap_read(afe->regmap, AFE_I2S_CON2, &val);
> +	if (!!(val & AFE_I2S_CON2_EN) == !!enable)

(What does negating a bool twice do?)

> +		return; /* must skip soft reset */
> +
> +	/* I2S soft reset begin */
> +	regmap_update_bits(afe->regmap, AUDIO_TOP_CON1, 0x4, 0x4);
> +
> +	/* input */
> +	regmap_update_bits(afe->regmap, AFE_I2S_CON2, 0x1, !!enable);

Ditto.

> +
> +	/* output */
> +	regmap_update_bits(afe->regmap, AFE_I2S_CON1, 0x1, !!enable);

Ditto.

> +
> +	/* I2S soft reset end */
> +	udelay(1);
> +	regmap_update_bits(afe->regmap, AUDIO_TOP_CON1, 0x4, 0);
> +}

> +static const struct of_device_id mtk_afe_pcm_dt_match[] = {
> +	{ .compatible = "mediatek,mt8173-afe-pcm", },
> +	{ }
> +}; 

> +static struct platform_driver mtk_afe_pcm_driver = {
> +	.driver = {
> +		   .name = "mtk-afe-pcm",
> +		   .owner = THIS_MODULE,
> +		   .of_match_table = mtk_afe_pcm_dt_match,
> +		   .pm = &mtk_afe_pm_ops,
> +	},
> +	.probe = mtk_afe_pcm_dev_probe,
> +	.remove = mtk_afe_pcm_dev_remove,
> +};

> +MODULE_DESCRIPTION("Mediatek ALSA SoC AFE platform driver");
> +MODULE_AUTHOR("Koro Chen <koro.chen@...iatek.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DEVICE_TABLE(of, mtk_afe_pcm_dt_match);

(The common pattern is to have MODULE_DEVICE_TABLE() directly follow
that table.)

SND_SOC_MEDIATEK is a bool symbol and mtk-afe-pcm.o is built-in only.
But the code uses a few module specific constructs. I spotted
THIS_MODULE, MODULE_DESCRIPTION, MODULE_AUTHOR, MODULE_LICENSE, and
MODULE_DEVICE_TABLE.

Is SND_SOC_MEDIATEK perhaps meant to be bool?

Likewise for SND_SOC_MT8173_MAX98090 (in 2/3) and
SND_SOC_MT8173_RT5650_RT5676 (in 3/3).

Thanks,


Paul Bolle

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