linux-kernel - Re: [PATCH 2/3] mmc: sdhci-dwcmshc: Add Canaan K230 DWCMSHC controller support

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Message-ID: <e06bd9ca-11bb-4d87-9db5-87139731f181@kernel.org>
Date: Fri, 6 Feb 2026 14:26:40 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>, ulf.hansson@...aro.org,
 adrian.hunter@...el.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org
Cc: pjw@...nel.org, palmer@...belt.com, aou@...s.berkeley.edu,
 linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 gaohan@...as.ac.cn, me@...ao.cc
Subject: Re: [PATCH 2/3] mmc: sdhci-dwcmshc: Add Canaan K230 DWCMSHC
 controller support

On 04/02/2026 09:29, Jiayu Du wrote:
> +static int dwcmshc_k230_init(struct device *dev, struct sdhci_host *host,
> +			     struct dwcmshc_priv *dwc_priv)
> +{
> +	static const char * const clk_ids[] = {"base", "timer", "ahb"};
> +	struct device_node *usb_phy_node;
> +	struct k230_priv *k230_priv;
> +	u32 data;
> +	int ret;
> +
> +	k230_priv = devm_kzalloc(dev, sizeof(struct k230_priv), GFP_KERNEL);
> +	if (!k230_priv)
> +		return -ENOMEM;
> +	dwc_priv->priv = k230_priv;
> +
> +	usb_phy_node = of_find_compatible_node(NULL, NULL, "canaan,k230-usb-phy");

Hm? You should use phandles, not look for various nodes.

> +	if (!usb_phy_node) {

Please follow Linux coding style.

> +		return dev_err_probe(dev, -ENODEV,
> +				     "Failed to find k230-usb-phy node\n");
> +	}
> +
> +	k230_priv->hi_sys_regmap = device_node_to_regmap(usb_phy_node);
> +	of_node_put(usb_phy_node);
> +	if (IS_ERR(k230_priv->hi_sys_regmap)) {
> +		return dev_err_probe(dev, PTR_ERR(k230_priv->hi_sys_regmap),
> +				     "Failed to get k230-usb-phy regmap\n");
> +	}
> +
> +	ret = dwcmshc_get_enable_other_clks(mmc_dev(host->mmc), dwc_priv,
> +					    ARRAY_SIZE(clk_ids), clk_ids);
> +	if (ret) {
> +		return dev_err_probe(dev, ret,
> +				     "Failed to get/enable k230 mmc other clocks\n");
> +	}
> +
> +	if (of_device_is_compatible(dev->of_node, "canaan,k230-sdio")) {

Driver match data is for this.


Best regards,
Krzysztof