diff mbox series

[v1,2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver

Message ID 20221130150857.67113-3-tmaimon77@gmail.com
State New
Headers
Series MMC: add NPCM SDHCI driver support |

Commit Message

Tomer Maimon Nov. 30, 2022, 3:08 p.m. UTC 
  Add Nuvoton NPCM BMC sdhci-pltfm controller driver.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 drivers/mmc/host/Kconfig      |  8 ++++
 drivers/mmc/host/Makefile     |  1 +
 drivers/mmc/host/sdhci-npcm.c | 81 +++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-npcm.c

Comments

Andy Shevchenko Nov. 30, 2022, 3:50 p.m. UTC | #1 
On Wed, Nov 30, 2022 at 5:09 PM Tomer Maimon <tmaimon77@gmail.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);
Tomer Maimon Nov. 30, 2022, 5:38 p.m. UTC | #2 
Hi Andy,

Thanks for your comments.

On Wed, 30 Nov 2022 at 17:50, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
>
> On Wed, Nov 30, 2022 at 5:09 PM Tomer Maimon <tmaimon77@gmail.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?
Can you explain what you mean by using sdhci as a library?
is it not to use the pltfm_data structure and only to set the quirks
directly through the host?
> ...
>
> > +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?
which specific helper? can you give me more specific details?
>
> > +       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

Best regards,

Tomer
Adrian Hunter Dec. 1, 2022, 4:27 p.m. UTC | #3 
On 30/11/22 17:08, Tomer Maimon wrote:
> Add Nuvoton NPCM BMC sdhci-pltfm controller driver.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
> ---
>  drivers/mmc/host/Kconfig      |  8 ++++
>  drivers/mmc/host/Makefile     |  1 +
>  drivers/mmc/host/sdhci-npcm.c | 81 +++++++++++++++++++++++++++++++++++
>  3 files changed, 90 insertions(+)
>  create mode 100644 drivers/mmc/host/sdhci-npcm.c
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index fb1062a6394c..4b2d9ce4308c 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -709,6 +709,14 @@ config MMC_TMIO
>  	  This provides support for the SD/MMC cell found in TC6393XB,
>  	  T7L66XB and also HTC ASIC3
>  
> +config MMC_SDHCI_NPCM
> +	tristate "Secure Digital Host Controller Interface support for NPCM"
> +	depends on ARCH_NPCM || COMPILE_TEST
> +	depends on MMC_SDHCI_PLTFM
> +	help
> +	  This provides support for the SD/eMMC controller found in
> +	  NPCM BMC family SoCs.
> +
>  config MMC_SDHI
>  	tristate "Renesas SDHI SD/SDIO controller support"
>  	depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 4e4ceb32c4b4..801086613d7f 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_SPI)		+= of_mmc_spi.o
>  obj-$(CONFIG_MMC_S3C)   	+= s3cmci.o
>  obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
>  obj-$(CONFIG_MMC_TMIO)		+= tmio_mmc.o
> +obj-$(CONFIG_MMC_SDHCI_NPCM)	+= sdhci-npcm.o
>  obj-$(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
> diff --git a/drivers/mmc/host/sdhci-npcm.c b/drivers/mmc/host/sdhci-npcm.c
> new file mode 100644
> index 000000000000..298c5f3e7c2b
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-npcm.c
> @@ -0,0 +1,81 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * NPCM SDHC MMC host controller driver.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +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,
> +};
> +
> +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);

For an optional clock, something like:

	pltfm_host->clk = devm_clk_get_optional(&pdev->dev, NULL);
	if (IS_ERR(pltfm_host->clk))
		return PTR_ERR(pltfm_host->clk);

will handle -EPROBE_DEFER

> +
> +	if (!IS_ERR(pltfm_host->clk))
> +		clk_prepare_enable(pltfm_host->clk);
> +
> +	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;
> +}
> +
> +static const struct of_device_id npcm_sdhci_of_match[] = {
> +	{ .compatible = "nuvoton,npcm750-sdhci" },
> +	{ .compatible = "nuvoton,npcm845-sdhci" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
> +
> +static struct platform_driver npcm_sdhci_driver = {
> +	.driver = {
> +		.name	= "npcm-sdhci",
> +		.of_match_table = npcm_sdhci_of_match,
> +		.pm	= &sdhci_pltfm_pmops,
> +	},
> +	.probe		= npcm_sdhci_probe,
> +	.remove		= sdhci_pltfm_unregister,
> +};
> +
> +module_platform_driver(npcm_sdhci_driver);
> +
> +MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
> +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
> +MODULE_LICENSE("GPL v2");

WARNING: Prefer "GPL" over "GPL v2" - see commit bf7fbeeae6db ("module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity")
#133: FILE: drivers/mmc/host/sdhci-npcm.c:81:
+MODULE_LICENSE("GPL v2");
Tomer Maimon Dec. 4, 2022, 11:21 a.m. UTC | #4 
Hi Adrian,

Thanks for your comments.

Your comments will be addressed next version.

On Thu, 1 Dec 2022 at 18:28, Adrian Hunter <adrian.hunter@intel.com> wrote:
>
> On 30/11/22 17:08, Tomer Maimon wrote:
> > Add Nuvoton NPCM BMC sdhci-pltfm controller driver.
> >
> > Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
> > ---
> >  drivers/mmc/host/Kconfig      |  8 ++++
> >  drivers/mmc/host/Makefile     |  1 +
> >  drivers/mmc/host/sdhci-npcm.c | 81 +++++++++++++++++++++++++++++++++++
> >  3 files changed, 90 insertions(+)
> >  create mode 100644 drivers/mmc/host/sdhci-npcm.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index fb1062a6394c..4b2d9ce4308c 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -709,6 +709,14 @@ config MMC_TMIO
> >         This provides support for the SD/MMC cell found in TC6393XB,
> >         T7L66XB and also HTC ASIC3
> >
> > +config MMC_SDHCI_NPCM
> > +     tristate "Secure Digital Host Controller Interface support for NPCM"
> > +     depends on ARCH_NPCM || COMPILE_TEST
> > +     depends on MMC_SDHCI_PLTFM
> > +     help
> > +       This provides support for the SD/eMMC controller found in
> > +       NPCM BMC family SoCs.
> > +
> >  config MMC_SDHI
> >       tristate "Renesas SDHI SD/SDIO controller support"
> >       depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 4e4ceb32c4b4..801086613d7f 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_SPI)               += of_mmc_spi.o
> >  obj-$(CONFIG_MMC_S3C)        += s3cmci.o
> >  obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
> >  obj-$(CONFIG_MMC_TMIO)               += tmio_mmc.o
> > +obj-$(CONFIG_MMC_SDHCI_NPCM) += sdhci-npcm.o
> >  obj-$(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
> > diff --git a/drivers/mmc/host/sdhci-npcm.c b/drivers/mmc/host/sdhci-npcm.c
> > new file mode 100644
> > index 000000000000..298c5f3e7c2b
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-npcm.c
> > @@ -0,0 +1,81 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * NPCM SDHC MMC host controller driver.
> > + *
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +
> > +#include "sdhci-pltfm.h"
> > +
> > +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,
> > +};
> > +
> > +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);
>
> For an optional clock, something like:
>
>         pltfm_host->clk = devm_clk_get_optional(&pdev->dev, NULL);
>         if (IS_ERR(pltfm_host->clk))
>                 return PTR_ERR(pltfm_host->clk);
>
> will handle -EPROBE_DEFER
>
> > +
> > +     if (!IS_ERR(pltfm_host->clk))
> > +             clk_prepare_enable(pltfm_host->clk);
> > +
> > +     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;
> > +}
> > +
> > +static const struct of_device_id npcm_sdhci_of_match[] = {
> > +     { .compatible = "nuvoton,npcm750-sdhci" },
> > +     { .compatible = "nuvoton,npcm845-sdhci" },
> > +     { }
> > +};
> > +MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
> > +
> > +static struct platform_driver npcm_sdhci_driver = {
> > +     .driver = {
> > +             .name   = "npcm-sdhci",
> > +             .of_match_table = npcm_sdhci_of_match,
> > +             .pm     = &sdhci_pltfm_pmops,
> > +     },
> > +     .probe          = npcm_sdhci_probe,
> > +     .remove         = sdhci_pltfm_unregister,
> > +};
> > +
> > +module_platform_driver(npcm_sdhci_driver);
> > +
> > +MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
> > +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
> > +MODULE_LICENSE("GPL v2");
>
> WARNING: Prefer "GPL" over "GPL v2" - see commit bf7fbeeae6db ("module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity")
> #133: FILE: drivers/mmc/host/sdhci-npcm.c:81:
> +MODULE_LICENSE("GPL v2");
>
>

Best regards,

Tomer
diff mbox series

Patch

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index fb1062a6394c..4b2d9ce4308c 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -709,6 +709,14 @@  config MMC_TMIO
 	  This provides support for the SD/MMC cell found in TC6393XB,
 	  T7L66XB and also HTC ASIC3
 
+config MMC_SDHCI_NPCM
+	tristate "Secure Digital Host Controller Interface support for NPCM"
+	depends on ARCH_NPCM || COMPILE_TEST
+	depends on MMC_SDHCI_PLTFM
+	help
+	  This provides support for the SD/eMMC controller found in
+	  NPCM BMC family SoCs.
+
 config MMC_SDHI
 	tristate "Renesas SDHI SD/SDIO controller support"
 	depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 4e4ceb32c4b4..801086613d7f 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -37,6 +37,7 @@  obj-$(CONFIG_MMC_SPI)		+= of_mmc_spi.o
 obj-$(CONFIG_MMC_S3C)   	+= s3cmci.o
 obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
 obj-$(CONFIG_MMC_TMIO)		+= tmio_mmc.o
+obj-$(CONFIG_MMC_SDHCI_NPCM)	+= sdhci-npcm.o
 obj-$(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
diff --git a/drivers/mmc/host/sdhci-npcm.c b/drivers/mmc/host/sdhci-npcm.c
new file mode 100644
index 000000000000..298c5f3e7c2b
--- /dev/null
+++ b/drivers/mmc/host/sdhci-npcm.c
@@ -0,0 +1,81 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * NPCM SDHC MMC host controller driver.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "sdhci-pltfm.h"
+
+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,
+};
+
+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);
+
+	if (!IS_ERR(pltfm_host->clk))
+		clk_prepare_enable(pltfm_host->clk);
+
+	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;
+}
+
+static const struct of_device_id npcm_sdhci_of_match[] = {
+	{ .compatible = "nuvoton,npcm750-sdhci" },
+	{ .compatible = "nuvoton,npcm845-sdhci" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
+
+static struct platform_driver npcm_sdhci_driver = {
+	.driver = {
+		.name	= "npcm-sdhci",
+		.of_match_table = npcm_sdhci_of_match,
+		.pm	= &sdhci_pltfm_pmops,
+	},
+	.probe		= npcm_sdhci_probe,
+	.remove		= sdhci_pltfm_unregister,
+};
+
+module_platform_driver(npcm_sdhci_driver);
+
+MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_LICENSE("GPL v2");