linux-kernel - Re: [PATCH v2 2/2] mmc: sdhci-of-ma35d1: Add Nuvoton MA35D1 SDHCI driver

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Date: Fri, 28 Jun 2024 09:31:01 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Shan-Chun Hung <shanchun1218@...il.com>, ulf.hansson@...aro.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 adrian.hunter@...el.com, p.zabel@...gutronix.de, pbrobinson@...il.com,
 serghox@...il.com, mcgrof@...nel.org,
 prabhakar.mahadev-lad.rj@...renesas.com, forbidden405@...look.com,
 tmaimon77@...il.com, andy.shevchenko@...il.com,
 linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: ychuang3@...oton.com, schung@...oton.com
Subject: Re: [PATCH v2 2/2] mmc: sdhci-of-ma35d1: Add Nuvoton MA35D1 SDHCI
 driver

On 26/06/2024 11:49, Shan-Chun Hung wrote:
> Add the SDHCI driver for the MA35D1 platform. It is based upon the
> SDHCI interface, but requires some extra initialization.
> 


> +static int ma35_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct sdhci_host *host;
> +	struct ma35_priv *priv;
> +	int err;
> +	u32 extra, ctl;
> +
> +	host = sdhci_pltfm_init(pdev, &sdhci_ma35_pdata, sizeof(struct ma35_priv));
> +	if (IS_ERR(host))
> +		return PTR_ERR(host);
> +
> +	err = devm_add_action_or_reset(dev, ma35_sdhci_pltfm_free, pdev);
> +	if (err)
> +		return dev_err_probe(dev, err, "Failed to register sdhci_pltfm_free action\n");
> +
> +	/* Extra adma table cnt for cross 128M boundary handling. */
> +	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(dev), SZ_128M);
> +	extra = min(extra, SDHCI_MAX_SEGS);
> +
> +	host->adma_table_cnt += extra;
> +	pltfm_host = sdhci_priv(host);
> +	priv = sdhci_pltfm_priv(pltfm_host);
> +
> +	pltfm_host->clk = devm_clk_get_optional_enabled(dev, NULL);
> +	if (IS_ERR(pltfm_host->clk))
> +		return dev_err_probe(dev, IS_ERR(pltfm_host->clk), "failed to get clk\n");

Ykes, you cannot return IS_ERR.

> +
> +	err = mmc_of_parse(host->mmc);
> +	if (err)
> +		return err;
> +
> +	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
> +	if (IS_ERR(priv->rst))
> +		return dev_err_probe(dev, PTR_ERR(priv->rst), "failed to get reset control\n");
> +


Best regards,
Krzysztof