linux-kernel - Re: [PATCH 1/3] mmc: dw_mmc: add support for hi3798mv200

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Date: Thu, 15 Feb 2024 20:15:09 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: forbidden405@...look.com, Ulf Hansson <ulf.hansson@...aro.org>,
 Jaehoon Chung <jh80.chung@...sung.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Igor Opaniuk <igor.opaniuk@...aro.org>,
 tianshuliang <tianshuliang@...ilicon.com>, David Yang <mmyangfl@...il.com>,
 linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] mmc: dw_mmc: add support for hi3798mv200

On 15/02/2024 18:46, Yang Xiwen via B4 Relay wrote:
> From: Yang Xiwen <forbidden405@...look.com>
> 
> Add support for Hi3798MV200 specific extension.
> 
> Signed-off-by: Yang Xiwen <forbidden405@...look.com>


> +
> +static int dw_mci_hi3798mv200_init(struct dw_mci *host)
> +{
> +	struct dw_mci_hi3798mv200_priv *priv;
> +	struct device_node *np = host->dev->of_node;
> +
> +	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	mmc_of_parse_clk_phase(host->dev, &priv->phase_map);
> +
> +	priv->sample_clk = devm_clk_get_enabled(host->dev, "ciu-sample");
> +	if (IS_ERR(priv->sample_clk)) {
> +		dev_err(host->dev, "failed to get enabled ciu-sample clock\n");

syntax is: return dev_err_probe()

> +		return PTR_ERR(priv->sample_clk);
> +	}
> +
> +	priv->drive_clk = devm_clk_get_enabled(host->dev, "ciu-drive");
> +	if (IS_ERR(priv->drive_clk)) {
> +		dev_err(host->dev, "failed to get enabled ciu-drive clock\n");

syntax is: return dev_err_probe()

> +		return PTR_ERR(priv->drive_clk);
> +	}
> +
> +	priv->sap_dll_reg = syscon_regmap_lookup_by_phandle(np, "hisilicon,sap-dll-reg");
> +	if (IS_ERR(priv->sap_dll_reg)) {
> +		dev_err(host->dev, "failed to get sap-dll-reg\n");

syntax is: return dev_err_probe()

> +		return PTR_ERR(priv->sap_dll_reg);
> +	}
> +
> +	host->priv = priv;
> +	return 0;
> +}
> +

...

> +
> +MODULE_DEVICE_TABLE(of, dw_mci_hi3798mv200_match);
> +static struct platform_driver dw_mci_hi3798mv200_driver = {
> +	.probe = dw_mci_hi3798mv200_probe,
> +	.remove_new = dw_mci_hi3798mv200_remove,
> +	.driver = {
> +		.name = "dwmmc_hi3798mv200",
> +		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
> +		.of_match_table = dw_mci_hi3798mv200_match,
> +	},
> +};
> +module_platform_driver(dw_mci_hi3798mv200_driver);
> +
> +MODULE_DESCRIPTION("HiSilicon Hi3798MV200 Specific DW-MSHC Driver Extension");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:dwmmc_hi3798mv200");

You should not need MODULE_ALIAS() in normal cases. If you need it,
usually it means your device ID table is wrong (e.g. misses either
entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
for incomplete ID table.

> 

Best regards,
Krzysztof