linux-kernel - Re: [PATCH 1/2] mmc: Add SD/SDIO driver for Sunplus SP7021

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Date:   Tue, 02 Nov 2021 15:34:20 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "LH.Kuo" <lhjeff911@...il.com>, ulf.hansson@...aro.org,
        robh+dt@...nel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org
Cc:     dvorkin@...bo.com, qinjian@...lus1.com, wells.lu@...plus.com,
        "LH.Kuo" <lh.kuo@...plus.com>
Subject: Re: [PATCH 1/2] mmc: Add SD/SDIO driver for Sunplus SP7021

On Fri, 2021-10-29 at 13:57 +0800, LH.Kuo wrote:
[...]
> --- /dev/null
> +++ b/drivers/mmc/host/sunplus_sd2.c
> @@ -0,0 +1,1069 @@
[...]
> +static void spsdc_controller_init(struct spsdc_host *host)
> +{
> +	u32 value;
> +	int ret = reset_control_assert(host->rstc);
> +
> +	if (!ret) {
> +		mdelay(1);

Consider using usleep_range(), see Documentation/timers/timers-howto.rst

[...]
> +static int spsdc_drv_probe(struct platform_device *pdev)
> +{
> +	int ret = 0;
> +	struct mmc_host *mmc;
> +	struct resource *resource;
> +	struct spsdc_host *host;
> +	unsigned int mode;
> +
> +	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
> +	if (!mmc) {
> +		ret = -ENOMEM;
> +		goto probe_free_host;
> +	}
> +
> +	host = mmc_priv(mmc);
> +	host->mmc = mmc;
> +	host->power_state = MMC_POWER_OFF;
> +	host->dma_int_threshold = 1024;
> +	host->dmapio_mode = SPSDC_DMA_MODE;
> +
> +	host->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(host->clk)) {
> +		spsdc_pr(ERROR, "Can not find clock source\n");
> +		ret = PTR_ERR(host->clk);
> +		goto probe_free_host;
> +	}
> +
> +	host->rstc = devm_reset_control_get(&pdev->dev, NULL);

Please use devm_reset_control_get_exclusive() instead.

regards
Philipp