linux-kernel - Re: [PATCH V1 3/3] ASoC: codecs: Add aw87390 amplifier driver

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Message-ID: <5ea76d3f-c9dd-10f5-4f9a-7b32b535ab5c@linaro.org>
Date:   Mon, 4 Sep 2023 14:17:43 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     wangweidong.a@...nic.com, lgirdwood@...il.com, broonie@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, perex@...ex.cz, tiwai@...e.com,
        rf@...nsource.cirrus.com, herve.codina@...tlin.com,
        shumingf@...ltek.com, rdunlap@...radead.org, 13916275206@....com,
        ryans.lee@...log.com, linus.walleij@...aro.org,
        ckeepax@...nsource.cirrus.com, yijiangtao@...nic.com,
        liweilei@...nic.com, colin.i.king@...il.com, trix@...hat.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     zhangjianming@...nic.com
Subject: Re: [PATCH V1 3/3] ASoC: codecs: Add aw87390 amplifier driver

On 04/09/2023 13:46, wangweidong.a@...nic.com wrote:
> From: Weidong Wang <wangweidong.a@...nic.com>
> 

...

> +static void aw87390_parse_channel_dt(struct aw87390 *aw87390)
> +{
> +	struct aw_device *aw_dev = aw87390->aw_pa;
> +	struct device_node *np = aw_dev->dev->of_node;
> +	u32 channel_value = AW87390_DEV_DEFAULT_CH;
> +
> +	of_property_read_u32(np, "sound-channel", &channel_value);

NAK, there is no such property. It seems you already sneaked in such for
other codecs. Please do not repeat such patterns of work.

That's also why I expect full DTS example, not some reduced pieces.

> +
> +	aw_dev->channel = channel_value;
> +}
> +
> +static int aw87390_init(struct aw87390 **aw87390, struct i2c_client *i2c, struct regmap *regmap)
> +{
> +	struct aw_device *aw_dev;
> +	unsigned int chip_id;
> +	int ret;
> +
> +	/* read chip id */
> +	ret = regmap_read(regmap, AW87390_ID_REG, &chip_id);
> +	if (ret) {
> +		dev_err(&i2c->dev, "%s read chipid error. ret = %d\n", __func__, ret);
> +		return ret;
> +	}
> +
> +	if (chip_id != AW87390_CHIP_ID) {
> +		dev_err(&i2c->dev, "unsupported device\n");

Why? The compatible tells it cannot be anything else.

> +		return -ENXIO;
> +	}
> +
> +	dev_info(&i2c->dev, "chip id = 0x%x\n", chip_id);
> +
> +	aw_dev = devm_kzalloc(&i2c->dev, sizeof(*aw_dev), GFP_KERNEL);
> +	if (!aw_dev)
> +		return -ENOMEM;
> +
> +	(*aw87390)->aw_pa = aw_dev;
> +	aw_dev->i2c = i2c;
> +	aw_dev->regmap = regmap;
> +	aw_dev->dev = &i2c->dev;
> +	aw_dev->chip_id = AW87390_CHIP_ID;
> +	aw_dev->acf = NULL;
> +	aw_dev->prof_info.prof_desc = NULL;
> +	aw_dev->prof_info.count = 0;
> +	aw_dev->prof_info.prof_type = AW88395_DEV_NONE_TYPE_ID;
> +	aw_dev->channel = AW87390_DEV_DEFAULT_CH;
> +	aw_dev->fw_status = AW87390_DEV_FW_FAILED;
> +	aw_dev->prof_index = AW87390_INIT_PROFILE;
> +	aw_dev->status = AW87390_DEV_PW_OFF;
> +
> +	aw87390_parse_channel_dt(*aw87390);
> +
> +	return ret;
> +}
> +
> +static int aw87390_i2c_probe(struct i2c_client *i2c)
> +{
> +	struct aw87390 *aw87390;
> +	int ret;
> +
> +	ret = i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C);
> +	if (!ret)
> +		return dev_err_probe(&i2c->dev, -ENXIO, "check_functionality failed\n");
> +
> +	aw87390 = devm_kzalloc(&i2c->dev, sizeof(*aw87390), GFP_KERNEL);
> +	if (!aw87390)
> +		return -ENOMEM;
> +
> +	mutex_init(&aw87390->lock);
> +
> +	i2c_set_clientdata(i2c, aw87390);
> +
> +	aw87390->regmap = devm_regmap_init_i2c(i2c, &aw87390_remap_config);
> +	if (IS_ERR(aw87390->regmap)) {
> +		ret = PTR_ERR(aw87390->regmap);

ret is not needed here, so just:
return dev_err_probe()

> +		return dev_err_probe(&i2c->dev, ret, "failed to init regmap: %d\n", ret);
> +	}
> +
> +	/* aw pa init */
> +	ret = aw87390_init(&aw87390, i2c, aw87390->regmap);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_write(aw87390->regmap, AW87390_ID_REG, AW87390_SOFT_RESET_VALUE);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_snd_soc_register_component(&i2c->dev,
> +				&soc_codec_dev_aw87390, NULL, 0);
> +	if (ret)
> +		dev_err(&i2c->dev, "failed to register aw87390: %d\n", ret);
> +
> +	return ret;
> +}


Best regards,
Krzysztof