linux-kernel - Re: [PATCH v1 2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver

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Message-ID: <CAHp75Vf-EKa9rdpmO54h0rgMcN4TLk8GcYfrjb-2Cy-GRVgEKA@mail.gmail.com>
Date:   Wed, 30 Nov 2022 17:50:04 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     ulf.hansson@...aro.org, avifishman70@...il.com,
        tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com, adrian.hunter@...el.com,
        skhan@...uxfoundation.org, davidgow@...gle.com,
        pbrobinson@...il.com, gsomlo@...il.com, briannorris@...omium.org,
        arnd@...db.de, krakoczy@...micro.com, openbmc@...ts.ozlabs.org,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver

On Wed, Nov 30, 2022 at 5:09 PM Tomer Maimon <tmaimon77@...il.com> wrote:
>
> Add Nuvoton NPCM BMC sdhci-pltfm controller driver.

...

>  obj-$(CONFIG_MMC_S3C)          += s3cmci.o
>  obj-$(CONFIG_MMC_SDRICOH_CS)   += sdricoh_cs.o
>  obj-$(CONFIG_MMC_TMIO)         += tmio_mmc.o

> +obj-$(CONFIG_MMC_SDHCI_NPCM)   += sdhci-npcm.o

Keep it ordered by module name.

>  obj-$(CONFIG_MMC_TMIO_CORE)    += tmio_mmc_core.o
>  obj-$(CONFIG_MMC_SDHI)         += renesas_sdhi_core.o
>  obj-$(CONFIG_MMC_SDHI_SYS_DMAC)                += renesas_sdhi_sys_dmac.o

...

> +/*
> + * NPCM SDHC MMC host controller driver.
> + *
> + */

Too many lines for seems to be oneliner comment.

...

> +#include <linux/of.h>

I don't see how it's being used.
But it seems the mod_devicetable.h is missing.

...

> +static const struct sdhci_pltfm_data npcm_sdhci_pdata = {
> +       .quirks  = SDHCI_QUIRK_DELAY_AFTER_POWER,
> +       .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC |
> +                  SDHCI_QUIRK2_NO_1_8_V,
> +};

Why? Can't you use the sdhci as a library?

...

> +static int npcm_sdhci_probe(struct platform_device *pdev)
> +{
> +       struct sdhci_pltfm_host *pltfm_host;
> +       struct sdhci_host *host;
> +       u32 caps;
> +       int ret;
> +
> +       host = sdhci_pltfm_init(pdev, &npcm_sdhci_pdata, 0);
> +       if (IS_ERR(host))
> +               return PTR_ERR(host);
> +
> +       pltfm_host = sdhci_priv(host);

> +       pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
> +

Blank line in a wrong position, should be before devm_clk_get().

> +       if (!IS_ERR(pltfm_host->clk))
> +               clk_prepare_enable(pltfm_host->clk);

Why not use a specific helper that gets the clock enabled?

> +       caps = sdhci_readl(host, SDHCI_CAPABILITIES);
> +       if (caps & SDHCI_CAN_DO_8BIT)
> +               host->mmc->caps |= MMC_CAP_8_BIT_DATA;
> +
> +       ret = mmc_of_parse(host->mmc);
> +       if (ret)
> +               goto err_sdhci_add;
> +
> +       ret = sdhci_add_host(host);
> +       if (ret)
> +               goto err_sdhci_add;
> +
> +       return 0;
> +
> +err_sdhci_add:
> +       clk_disable_unprepare(pltfm_host->clk);
> +       sdhci_pltfm_free(pdev);
> +       return ret;
> +}

...

> +

Redundant blank line.

> +module_platform_driver(npcm_sdhci_driver);

-- 
With Best Regards,
Andy Shevchenko