[PATCH v3 0/3] Add DT support for davinci_mmc driver

[PATCH v3 0/3] Add DT support for davinci_mmc driver

[Manjunathappa, Prakash]

Patch set adds DT support for davinci_mmc driver and is
verified on da850-evm without card_detect/write_protect and
EDMA support.

This patch depends on below patches under review:
1) Patch "drivers/pinctrl: grab default handles from device core"
	http://www.gossamer-threads.com/lists/linux/kernel/1664015?page=last
2) Patch "mmc: davinci: allow driver to work without DMA resource"
	http://www.mail-archive.com/linux-mmc@vger.kernel.org/msg18771.html

Applies on top of v3.9/dt-2 branch of linux_davinci tree:
git://gitorious.org/linux-davinci/linux-davinci.git

Since v2:
Modified the default value for bus-width and skipping the property specifications
for highspeed card capabilties for now. Re-ordered patch 2 and 3.
Since v1:
Modified the DT parse function to take default values, updated DT binding
documentation accordingly.

Manjunathappa, Prakash (3):
  mmc: davinci_mmc: add DT support
  ARM: davinci: da850: add mmc DT entries
  ARM: davinci: da850: override mmc DT node device name

 .../devicetree/bindings/mmc/davinci_mmc.txt        |   25 ++++++++
 arch/arm/boot/dts/da850-evm.dts                    |    7 ++
 arch/arm/boot/dts/da850.dtsi                       |   14 ++++
 arch/arm/mach-davinci/da8xx-dt.c                   |    2 +
 drivers/mmc/host/davinci_mmc.c                     |   65 +++++++++++++++++++-
 5 files changed, 111 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt

-- 
1.7.4.1

[PATCH v3 1/3] mmc: davinci_mmc: add DT support

[Manjunathappa, Prakash]

Adds device tree support for davinci_mmc. Also add binding documentation.
As of now in non-dma PIO mode and without GPIO card_detect/write_protect
option because of dependencies on EDMA and GPIO module DT support.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Cc: linux-mmc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: devicetree-discuss@lists.ozlabs.org
Cc: cjb@laptop.org
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: mporter@ti.com
---
Since v2:
Modified the default value for bus-width and removed the support for
highspeed card capabilties for now.
Since v1:
Modified DT parse function to take default values and accomodate controller
version in compatible field.

 .../devicetree/bindings/mmc/davinci_mmc.txt        |   25 ++++++++
 drivers/mmc/host/davinci_mmc.c                     |   65 +++++++++++++++++++-
 2 files changed, 88 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt

diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
new file mode 100644
index 0000000..247be0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
@@ -0,0 +1,25 @@
+* TI Highspeed MMC host controller for DaVinci
+
+The Highspeed MMC Host Controller on TI DaVinci family
+provides an interface for MMC, SD and SDIO types of memory cards.
+
+This file documents the properties used by the davinci_mmc driver.
+
+Required properties:
+- compatible:
+ Should be "ti,davinci-mmc-da830": for da830, da850, dm365
+ Should be "ti,davinci-mmc-dm355": for dm355, dm644x
+
+Optional properties:
+- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1>
+- max-frequency: Maximum operating clock frequency, default 25MHz.
+
+Example:
+	mmc0: mmc@1c40000 {
+		compatible = "ti,davinci-mmc-da830",
+		reg = <0x40000 0x1000>;
+		interrupts = <16>;
+		status = "okay";
+		bus-width = <4>;
+		max-frequency = <50000000>;
+	};
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 27123f8..66ca6bf 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -34,6 +34,8 @@
 #include <linux/dma-mapping.h>
 #include <linux/edma.h>
 #include <linux/mmc/mmc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/platform_data/mmc-davinci.h>
 
@@ -1157,16 +1159,74 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
 	mmc_davinci_reset_ctrl(host, 0);
 }
 
-static int __init davinci_mmcsd_probe(struct platform_device *pdev)
+static const struct of_device_id davinci_mmc_dt_ids[] = {
+	{
+		.compatible = "ti,davinci-mmc-dm355",
+		.data = (void *)MMC_CTLR_VERSION_1,
+	},
+	{
+		.compatible = "ti,davinci-mmc-da830",
+		.data = (void *)MMC_CTLR_VERSION_2,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
+
+static struct davinci_mmc_config
+	*mmc_parse_pdata(struct platform_device *pdev)
 {
+	struct device_node *np;
 	struct davinci_mmc_config *pdata = pdev->dev.platform_data;
+	const struct of_device_id *match =
+		of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev);
+	u32 data;
+
+	np = pdev->dev.of_node;
+	if (!np)
+		return pdata;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
+		goto nodata;
+	}
+
+	if (match->data)
+		pdata->version = (u8)((int)match->data);
+
+	of_property_read_u32(np, "max-frequency", &pdata->max_freq);
+	if (!pdata->max_freq)
+		dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
+
+	of_property_read_u32(np, "bus-width", &data);
+	switch (data) {
+	case 1:
+	case 4:
+	case 8:
+		pdata->wires = data;
+		break;
+	default:
+		pdata->wires = 1;
+		dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
+	}
+nodata:
+	return pdata;
+}
+
+static int __init davinci_mmcsd_probe(struct platform_device *pdev)
+{
+	struct davinci_mmc_config *pdata = NULL;
 	struct mmc_davinci_host *host = NULL;
 	struct mmc_host *mmc = NULL;
 	struct resource *r, *mem = NULL;
 	int ret = 0, irq = 0;
 	size_t mem_size;
 
-	/* REVISIT:  when we're fully converted, fail if pdata is NULL */
+	pdata = mmc_parse_pdata(pdev);
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "Can not get platform data\n");
+		return -ENOENT;
+	}
 
 	ret = -ENODEV;
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1408,6 +1468,7 @@ static struct platform_driver davinci_mmcsd_driver = {
 		.name	= "davinci_mmc",
 		.owner	= THIS_MODULE,
 		.pm	= davinci_mmcsd_pm_ops,
+		.of_match_table = of_match_ptr(davinci_mmc_dt_ids),
 	},
 	.remove		= __exit_p(davinci_mmcsd_remove),
 };
-- 
1.7.4.1

[PATCH v3 2/3] ARM: davinci: da850: add mmc DT entries

[Manjunathappa, Prakash]

Add DT entry for MMC. Also add entry for pinmux information.
Tested:
1) Without GPIO card detection and EDMA support as DT support for
   GPIO and EDMA are yet come.
2) By creating/deleting files and mounting/unmounting the partition.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Cc: linux-mmc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: devicetree-discuss@lists.ozlabs.org
Cc: cjb@laptop.org
Cc: Sekhar Nori <nsekhar@ti.com>
---
Since v2:
Remove properties specifying for highspeed card capability.
Since v1:
Removed bitfields for specifying the device capabilty and accomodate
controller revision in compatible field.

 arch/arm/boot/dts/da850-evm.dts |    7 +++++++
 arch/arm/boot/dts/da850.dtsi    |   14 ++++++++++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index f712fb6..78c8e54 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -39,6 +39,13 @@
 		wdt: wdt@1c21000 {
 			status = "okay";
 		};
+		mmc0: mmc@1c40000 {
+			max-frequency = <50000000>;
+			bus-width = <4>;
+			status = "okay";
+			pinctrl-names = "default";
+			pinctrl-0 = <&mmc0_pins>;
+		};
 	};
 	nand_cs3@62000000 {
 		status = "okay";
diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
index 4b2262a..ebe7386 100644
--- a/arch/arm/boot/dts/da850.dtsi
+++ b/arch/arm/boot/dts/da850.dtsi
@@ -67,6 +67,15 @@
 					0x10 0x00002200 0x0000ff00
 				>;
 			};
+			mmc0_pins: pinmux_mmc_pins {
+				pinctrl-single,bits = <
+					/* MMCSD0_DAT[3] MMCSD0_DAT[2]
+					 * MMCSD0_DAT[1] MMCSD0_DAT[0]
+					 * MMCSD0_CMD    MMCSD0_CLK
+					 */
+					0x28 0x00222222  0x00ffffff
+				>;
+			};
 		};
 		serial0: serial@1c42000 {
 			compatible = "ns16550a";
@@ -110,6 +119,11 @@
 		wdt: wdt@1c21000 {
 			compatible = "ti,davinci-wdt";
 			reg = <0x21000 0x1000>;
+		};
+		mmc0: mmc@1c40000 {
+			compatible = "ti,davinci-mmc-da830";
+			reg = <0x40000 0x1000>;
+			interrupts = <16>;
 			status = "disabled";
 		};
 	};
-- 
1.7.4.1

[PATCH v3 3/3] ARM: davinci: da850: override mmc DT node device name

[Manjunathappa, Prakash]

Populate OF_DEV_AUXDATA with desired device name expected by
davinci_mmc driver. Without this clk_get of davinci_mmc DT driver
fails.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Cc: linux-mmc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: devicetree-discuss@lists.ozlabs.org
Cc: cjb@laptop.org
Cc: Sekhar Nori <nsekhar@ti.com>
---
Since v2:
Rebased on top of v3.9/dt-2 branch of linux_davinci and reordered this patch.
Since v1:
No Change.

 arch/arm/mach-davinci/da8xx-dt.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index 5404e92..fc62240 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -40,6 +40,8 @@ static void __init da8xx_init_irq(void)
 struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ti,davinci-i2c", 0x01c22000, "i2c_davinci.1", NULL),
 	OF_DEV_AUXDATA("ti,davinci-wdt", 0x01c21000, "watchdog", NULL),
+	OF_DEV_AUXDATA("ti,davinci-mmc-da830", 0x01c40000, "davinci_mmc.0",
+			NULL),
 	{}
 };
 
-- 
1.7.4.1

Re: [PATCH v3 1/3] mmc: davinci_mmc: add DT support

[Mark Rutland]

Hi Prakash,

I think this looks pretty good now :)

Reviewed-by: Mark Rutland <mark.rutland@arm.com>

Thanks,
Mark.

On Tue, Feb 12, 2013 at 06:37:36AM +0000, Manjunathappa, Prakash wrote:
> Adds device tree support for davinci_mmc. Also add binding documentation.
> As of now in non-dma PIO mode and without GPIO card_detect/write_protect
> option because of dependencies on EDMA and GPIO module DT support.
> 
> Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
> Cc: linux-mmc@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: davinci-linux-open-source@linux.davincidsp.com
> Cc: devicetree-discuss@lists.ozlabs.org
> Cc: cjb@laptop.org
> Cc: Sekhar Nori <nsekhar@ti.com>
> Cc: mporter@ti.com
> ---
> Since v2:
> Modified the default value for bus-width and removed the support for
> highspeed card capabilties for now.
> Since v1:
> Modified DT parse function to take default values and accomodate controller
> version in compatible field.
> 
>  .../devicetree/bindings/mmc/davinci_mmc.txt        |   25 ++++++++
>  drivers/mmc/host/davinci_mmc.c                     |   65 +++++++++++++++++++-
>  2 files changed, 88 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> 
> diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> new file mode 100644
> index 0000000..247be0f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> @@ -0,0 +1,25 @@
> +* TI Highspeed MMC host controller for DaVinci
> +
> +The Highspeed MMC Host Controller on TI DaVinci family
> +provides an interface for MMC, SD and SDIO types of memory cards.
> +
> +This file documents the properties used by the davinci_mmc driver.
> +
> +Required properties:
> +- compatible:
> + Should be "ti,davinci-mmc-da830": for da830, da850, dm365
> + Should be "ti,davinci-mmc-dm355": for dm355, dm644x
> +
> +Optional properties:
> +- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1>
> +- max-frequency: Maximum operating clock frequency, default 25MHz.
> +
> +Example:
> +	mmc0: mmc@1c40000 {
> +		compatible = "ti,davinci-mmc-da830",
> +		reg = <0x40000 0x1000>;
> +		interrupts = <16>;
> +		status = "okay";
> +		bus-width = <4>;
> +		max-frequency = <50000000>;
> +	};
> diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> index 27123f8..66ca6bf 100644
> --- a/drivers/mmc/host/davinci_mmc.c
> +++ b/drivers/mmc/host/davinci_mmc.c
> @@ -34,6 +34,8 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/edma.h>
>  #include <linux/mmc/mmc.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  
>  #include <linux/platform_data/mmc-davinci.h>
>  
> @@ -1157,16 +1159,74 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
>  	mmc_davinci_reset_ctrl(host, 0);
>  }
>  
> -static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> +static const struct of_device_id davinci_mmc_dt_ids[] = {
> +	{
> +		.compatible = "ti,davinci-mmc-dm355",
> +		.data = (void *)MMC_CTLR_VERSION_1,
> +	},
> +	{
> +		.compatible = "ti,davinci-mmc-da830",
> +		.data = (void *)MMC_CTLR_VERSION_2,
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
> +
> +static struct davinci_mmc_config
> +	*mmc_parse_pdata(struct platform_device *pdev)
>  {
> +	struct device_node *np;
>  	struct davinci_mmc_config *pdata = pdev->dev.platform_data;
> +	const struct of_device_id *match =
> +		of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev);
> +	u32 data;
> +
> +	np = pdev->dev.of_node;
> +	if (!np)
> +		return pdata;
> +
> +	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> +	if (!pdata) {
> +		dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
> +		goto nodata;
> +	}
> +
> +	if (match->data)
> +		pdata->version = (u8)((int)match->data);
> +
> +	of_property_read_u32(np, "max-frequency", &pdata->max_freq);
> +	if (!pdata->max_freq)
> +		dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
> +
> +	of_property_read_u32(np, "bus-width", &data);
> +	switch (data) {
> +	case 1:
> +	case 4:
> +	case 8:
> +		pdata->wires = data;
> +		break;
> +	default:
> +		pdata->wires = 1;
> +		dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
> +	}
> +nodata:
> +	return pdata;
> +}
> +
> +static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> +{
> +	struct davinci_mmc_config *pdata = NULL;
>  	struct mmc_davinci_host *host = NULL;
>  	struct mmc_host *mmc = NULL;
>  	struct resource *r, *mem = NULL;
>  	int ret = 0, irq = 0;
>  	size_t mem_size;
>  
> -	/* REVISIT:  when we're fully converted, fail if pdata is NULL */
> +	pdata = mmc_parse_pdata(pdev);
> +	if (pdata == NULL) {
> +		dev_err(&pdev->dev, "Can not get platform data\n");
> +		return -ENOENT;
> +	}
>  
>  	ret = -ENODEV;
>  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -1408,6 +1468,7 @@ static struct platform_driver davinci_mmcsd_driver = {
>  		.name	= "davinci_mmc",
>  		.owner	= THIS_MODULE,
>  		.pm	= davinci_mmcsd_pm_ops,
> +		.of_match_table = of_match_ptr(davinci_mmc_dt_ids),
>  	},
>  	.remove		= __exit_p(davinci_mmcsd_remove),
>  };
> -- 
> 1.7.4.1
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
> 

RE: [PATCH v3 1/3] mmc: davinci_mmc: add DT support

[Manjunathappa, Prakash]

Hi Mark,

On Tue, Feb 12, 2013 at 16:30:48, Mark Rutland wrote:
> Hi Prakash,
> 
> I think this looks pretty good now :)
> 
> Reviewed-by: Mark Rutland <mark.rutland@arm.com>
> 

Thanks for inputs, I will add your Reviewed-by for future versions of this patch.

Regards,
Prakash

> Thanks,
> Mark.
> 
> On Tue, Feb 12, 2013 at 06:37:36AM +0000, Manjunathappa, Prakash wrote:
> > Adds device tree support for davinci_mmc. Also add binding documentation.
> > As of now in non-dma PIO mode and without GPIO card_detect/write_protect
> > option because of dependencies on EDMA and GPIO module DT support.
> > 
> > Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
> > Cc: linux-mmc@vger.kernel.org
> > Cc: linux-arm-kernel@lists.infradead.org
> > Cc: davinci-linux-open-source@linux.davincidsp.com
> > Cc: devicetree-discuss@lists.ozlabs.org
> > Cc: cjb@laptop.org
> > Cc: Sekhar Nori <nsekhar@ti.com>
> > Cc: mporter@ti.com
> > ---
> > Since v2:
> > Modified the default value for bus-width and removed the support for
> > highspeed card capabilties for now.
> > Since v1:
> > Modified DT parse function to take default values and accomodate controller
> > version in compatible field.
> > 
> >  .../devicetree/bindings/mmc/davinci_mmc.txt        |   25 ++++++++
> >  drivers/mmc/host/davinci_mmc.c                     |   65 +++++++++++++++++++-
> >  2 files changed, 88 insertions(+), 2 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > new file mode 100644
> > index 0000000..247be0f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > @@ -0,0 +1,25 @@
> > +* TI Highspeed MMC host controller for DaVinci
> > +
> > +The Highspeed MMC Host Controller on TI DaVinci family
> > +provides an interface for MMC, SD and SDIO types of memory cards.
> > +
> > +This file documents the properties used by the davinci_mmc driver.
> > +
> > +Required properties:
> > +- compatible:
> > + Should be "ti,davinci-mmc-da830": for da830, da850, dm365
> > + Should be "ti,davinci-mmc-dm355": for dm355, dm644x
> > +
> > +Optional properties:
> > +- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1>
> > +- max-frequency: Maximum operating clock frequency, default 25MHz.
> > +
> > +Example:
> > +	mmc0: mmc@1c40000 {
> > +		compatible = "ti,davinci-mmc-da830",
> > +		reg = <0x40000 0x1000>;
> > +		interrupts = <16>;
> > +		status = "okay";
> > +		bus-width = <4>;
> > +		max-frequency = <50000000>;
> > +	};
> > diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> > index 27123f8..66ca6bf 100644
> > --- a/drivers/mmc/host/davinci_mmc.c
> > +++ b/drivers/mmc/host/davinci_mmc.c
> > @@ -34,6 +34,8 @@
> >  #include <linux/dma-mapping.h>
> >  #include <linux/edma.h>
> >  #include <linux/mmc/mmc.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> >  
> >  #include <linux/platform_data/mmc-davinci.h>
> >  
> > @@ -1157,16 +1159,74 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
> >  	mmc_davinci_reset_ctrl(host, 0);
> >  }
> >  
> > -static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> > +static const struct of_device_id davinci_mmc_dt_ids[] = {
> > +	{
> > +		.compatible = "ti,davinci-mmc-dm355",
> > +		.data = (void *)MMC_CTLR_VERSION_1,
> > +	},
> > +	{
> > +		.compatible = "ti,davinci-mmc-da830",
> > +		.data = (void *)MMC_CTLR_VERSION_2,
> > +	},
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
> > +
> > +static struct davinci_mmc_config
> > +	*mmc_parse_pdata(struct platform_device *pdev)
> >  {
> > +	struct device_node *np;
> >  	struct davinci_mmc_config *pdata = pdev->dev.platform_data;
> > +	const struct of_device_id *match =
> > +		of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev);
> > +	u32 data;
> > +
> > +	np = pdev->dev.of_node;
> > +	if (!np)
> > +		return pdata;
> > +
> > +	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> > +	if (!pdata) {
> > +		dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
> > +		goto nodata;
> > +	}
> > +
> > +	if (match->data)
> > +		pdata->version = (u8)((int)match->data);
> > +
> > +	of_property_read_u32(np, "max-frequency", &pdata->max_freq);
> > +	if (!pdata->max_freq)
> > +		dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
> > +
> > +	of_property_read_u32(np, "bus-width", &data);
> > +	switch (data) {
> > +	case 1:
> > +	case 4:
> > +	case 8:
> > +		pdata->wires = data;
> > +		break;
> > +	default:
> > +		pdata->wires = 1;
> > +		dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
> > +	}
> > +nodata:
> > +	return pdata;
> > +}
> > +
> > +static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> > +{
> > +	struct davinci_mmc_config *pdata = NULL;
> >  	struct mmc_davinci_host *host = NULL;
> >  	struct mmc_host *mmc = NULL;
> >  	struct resource *r, *mem = NULL;
> >  	int ret = 0, irq = 0;
> >  	size_t mem_size;
> >  
> > -	/* REVISIT:  when we're fully converted, fail if pdata is NULL */
> > +	pdata = mmc_parse_pdata(pdev);
> > +	if (pdata == NULL) {
> > +		dev_err(&pdev->dev, "Can not get platform data\n");
> > +		return -ENOENT;
> > +	}
> >  
> >  	ret = -ENODEV;
> >  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > @@ -1408,6 +1468,7 @@ static struct platform_driver davinci_mmcsd_driver = {
> >  		.name	= "davinci_mmc",
> >  		.owner	= THIS_MODULE,
> >  		.pm	= davinci_mmcsd_pm_ops,
> > +		.of_match_table = of_match_ptr(davinci_mmc_dt_ids),
> >  	},
> >  	.remove		= __exit_p(davinci_mmcsd_remove),
> >  };
> > -- 
> > 1.7.4.1
> > 
> > _______________________________________________
> > devicetree-discuss mailing list
> > devicetree-discuss@lists.ozlabs.org
> > https://lists.ozlabs.org/listinfo/devicetree-discuss
> > 
> 
>