linux-kernel - Re: [PATCH v3 05/12] ASoC: mediatek: mt8188: support etdm in platform driver

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Message-ID: <869cfa5a-2cfa-e5b7-b8f5-a79b9b364b25@collabora.com>
Date:   Tue, 13 Dec 2022 11:45:32 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Trevor Wu <trevor.wu@...iatek.com>, broonie@...nel.org,
        lgirdwood@...il.com, tiwai@...e.com, perex@...ex.cz,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, p.zabel@...gutronix.de
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        alsa-devel@...a-project.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 05/12] ASoC: mediatek: mt8188: support etdm in platform
 driver

Il 08/12/22 04:31, Trevor Wu ha scritto:
> Add mt8188 etdm dai driver support.
> 
> Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
> ---
> I don't add Reviewed-by tag because one new header file is included
> in the patch to resolve compiling issue found by kernel test robot.
> Additionally, I re-layout the code for better understanding of the
> follow-up patch.
> ---
>   sound/soc/mediatek/mt8188/mt8188-dai-etdm.c | 2591 +++++++++++++++++++
>   1 file changed, 2591 insertions(+)
>   create mode 100644 sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> 
> diff --git a/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> new file mode 100644
> index 000000000000..c653fa5e3f85
> --- /dev/null
> +++ b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c

..snip..

> +
> +static void mt8188_dai_etdm_parse_of(struct mtk_base_afe *afe)
> +{
> +	const struct device_node *of_node = afe->dev->of_node;
> +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> +	struct mtk_dai_etdm_priv *etdm_data;
> +	int i, j;
> +	char prop[48];
> +	u8 disable_chn[MT8188_ETDM_MAX_CHANNELS];
> +	int max_chn = MT8188_ETDM_MAX_CHANNELS;
> +	u32 sel;
> +	int ret;
> +	int dai_id;
> +	unsigned int sync_id;
> +	struct {
> +		const char *name;
> +		const unsigned int sync_id;
> +	} of_afe_etdms[MT8188_AFE_IO_ETDM_NUM] = {
> +		{"etdm-in1", ETDM_SYNC_FROM_IN1},
> +		{"etdm-in2", ETDM_SYNC_FROM_IN2},
> +		{"etdm-out1", ETDM_SYNC_FROM_OUT1},
> +		{"etdm-out2", ETDM_SYNC_FROM_OUT2},
> +		{"etdm-out3", ETDM_SYNC_FROM_OUT3},
> +	};
> +
> +	for (i = 0; i < MT8188_AFE_IO_ETDM_NUM; i++) {
> +		dai_id = ETDM_TO_DAI_ID(i);
> +		etdm_data = afe_priv->dai_priv[dai_id];
> +
> +		ret = snprintf(prop, sizeof(prop),
> +			       "mediatek,%s-mclk-always-on-rate",
> +			       of_afe_etdms[i].name);
> +		if (ret < 0) {
> +			dev_info(afe->dev, "%s snprintf err=%d\n",

Is this property optional? If yes, this dev_info() must be a dev_dbg(),
otherwise, this must be a dev_err().

Please fix all prints to use the right message level.

> +				 __func__, ret);
> +			return;

Also, is it possible to specify this property only on selected eTDMs?

As it is right now, if anyone wants to specify this only on, for example,
etdm-out1 and out2, that won't work.
In that case, you should replace that return with a `continue`.

P.S.: I'm raising this question because you're not forcing "all or nothing"
       in commit [10/12] where you introduce the bindings for this driver,
       so I suppose that returning (hence stopping to parse) is a mistake.

> +		}
> +		ret = of_property_read_u32(of_node, prop, &sel);
> +		if (ret == 0) {
> +			etdm_data->mclk_dir = SND_SOC_CLOCK_OUT;
> +			if (mtk_dai_etdm_cal_mclk(afe, sel, dai_id))
> +				dev_info(afe->dev, "%s unsupported mclk %uHz\n",
> +					 __func__, sel);
> +		}
> +


Regards,
Angelo