[PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Stephen Warren]

From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>

Add hooks to read gpio configuration out of the device tree node.

[grant.likely: Rewrite of original patch from John Bonesio]
Signed-off-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
[swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly]
[swarren: Reworked to avoid #ifdef CONFIG_OF]
[swarren: Reworked binding based on fsl-imx-esdhc.txt]
[swarren: Documented binding]
Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
Theoretically, these two patches should be merged in order in one place,
since the 2nd logically depends on the first. However, it's really just
a documentation dependency, so I think it's fine to merge them into the
MMC and DT trees separately and let them meet in linux-next.

 .../devicetree/bindings/mmc/nvidia-sdhci.txt       |   25 ++++++++++
 drivers/mmc/host/sdhci-tegra.c                     |   51 +++++++++++++++----
 2 files changed, 65 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt

diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
new file mode 100644
index 0000000..c87f667
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
@@ -0,0 +1,25 @@
+* NVIDIA Tegra Secure Digital Host Controller
+
+This controller on Tegra family SoCs provides an interface for MMC, SD,
+and SDIO types of memory cards.
+
+Required properties:
+- compatible : Should be "nvidia,<chip>-sdhci"
+- reg : Should contain eSDHC registers location and length
+- interrupts : Should contain eSDHC interrupt
+
+Optional properties:
+- cd-gpios : Specify GPIOs for card detection
+- wp-gpios : Specify GPIOs for write protection
+- power-gpios : Specify GPIOs for power control
+
+Example:
+
+sdhci@c8000200 {
+	compatible = "nvidia,tegra20-sdhci";
+	reg = <0xc8000200 0x200>;
+	interrupts = <47>;
+	cd-gpios = <&gpio 69 0>; /* gpio PI5 */
+	wp-gpios = <&gpio 57 0>; /* gpio PH1 */
+	power-gpios = <&gpio 155 0>; /* gpio PT3 */
+};
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index a5a9a97..9ab18d6 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -17,6 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/of_gpio.h>
 #include <linux/gpio.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -74,10 +75,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
 
 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
 {
-	struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
-	struct tegra_sdhci_platform_data *plat;
-
-	plat = pdev->dev.platform_data;
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
+	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
 
 	if (!gpio_is_valid(plat->wp_gpio))
 		return -1;
@@ -95,12 +94,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
 
 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
 {
-	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
-	struct tegra_sdhci_platform_data *plat;
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
 	u32 ctrl;
 
-	plat = pdev->dev.platform_data;
-
 	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 	if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
 		ctrl &= ~SDHCI_CTRL_4BITBUS;
@@ -132,6 +129,34 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
 	.ops  = &tegra_sdhci_ops,
 };
 
+static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
+	{ .compatible = "nvidia,tegra20-sdhci", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
+
+static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
+						struct platform_device *pdev)
+{
+	struct tegra_sdhci_platform_data *plat;
+	struct device_node *np = pdev->dev.of_node;
+
+	if (!np)
+		return NULL;
+
+	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
+	if (!plat) {
+		dev_err(&pdev->dev, "Can't allocate platform data\n");
+		return NULL;
+	}
+
+	plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
+	plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
+	plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
+
+	return plat;
+}
+
 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
@@ -148,12 +173,17 @@ static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
 
 	plat = pdev->dev.platform_data;
 
+	if (plat == NULL)
+		plat = sdhci_tegra_dt_parse_pdata(pdev);
+
 	if (plat == NULL) {
 		dev_err(mmc_dev(host->mmc), "missing platform data\n");
 		rc = -ENXIO;
 		goto err_no_plat;
 	}
 
+	pltfm_host->priv = plat;
+
 	if (gpio_is_valid(plat->power_gpio)) {
 		rc = gpio_request(plat->power_gpio, "sdhci_power");
 		if (rc) {
@@ -248,13 +278,11 @@ static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
-	struct tegra_sdhci_platform_data *plat;
+	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
 	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 
 	sdhci_remove_host(host, dead);
 
-	plat = pdev->dev.platform_data;
-
 	if (gpio_is_valid(plat->wp_gpio)) {
 		tegra_gpio_disable(plat->wp_gpio);
 		gpio_free(plat->wp_gpio);
@@ -283,6 +311,7 @@ static struct platform_driver sdhci_tegra_driver = {
 	.driver		= {
 		.name	= "sdhci-tegra",
 		.owner	= THIS_MODULE,
+		.of_match_table = sdhci_tegra_dt_match,
 	},
 	.probe		= sdhci_tegra_probe,
 	.remove		= __devexit_p(sdhci_tegra_remove),
-- 
1.7.0.4

Re: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Chris Ball]

Hi Stephen,

On Tue, Aug 23 2011, Stephen Warren wrote:
> From: Grant Likely <grant.likely@secretlab.ca>
>
> Add hooks to read gpio configuration out of the device tree node.
>
> [grant.likely: Rewrite of original patch from John Bonesio]
> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
> [swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly]
> [swarren: Reworked to avoid #ifdef CONFIG_OF]
> [swarren: Reworked binding based on fsl-imx-esdhc.txt]
> [swarren: Documented binding]
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> Theoretically, these two patches should be merged in order in one place,
> since the 2nd logically depends on the first. However, it's really just
> a documentation dependency, so I think it's fine to merge them into the
> MMC and DT trees separately and let them meet in linux-next.
>
>  .../devicetree/bindings/mmc/nvidia-sdhci.txt       |   25 ++++++++++
>  drivers/mmc/host/sdhci-tegra.c                     |   51 +++++++++++++++----
>  2 files changed, 65 insertions(+), 11 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt

Okay, I've pushed this patch [1/2] to mmc-next for 3.2.

Thanks,

- Chris.
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child

[PATCH 2/2] arm/dt: Tegra: Update SDHCI nodes to match bindings

[Stephen Warren]

The bindings were recently updated to be more in-line with other SDHCI
bindings that are already merged.

Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/tegra-harmony.dts  |   12 ++++++------
 arch/arm/boot/dts/tegra-seaboard.dts |    6 +++---
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
index 4c05334..e581866 100644
--- a/arch/arm/boot/dts/tegra-harmony.dts
+++ b/arch/arm/boot/dts/tegra-harmony.dts
@@ -57,14 +57,14 @@
 	};
 
 	sdhci@c8000200 {
-		gpios = <&gpio 69 0>, /* cd, gpio PI5 */
-			<&gpio 57 0>, /* wp, gpio PH1 */
-			<&gpio 155 0>; /* power, gpio PT3 */
+		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
+		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
+		power-gpios = <&gpio 155 0>; /* gpio PT3 */
 	};
 
 	sdhci@c8000600 {
-		gpios = <&gpio 58 0>, /* cd, gpio PH2 */
-			<&gpio 59 0>, /* wp, gpio PH3 */
-			<&gpio 70 0>; /* power, gpio PI6 */
+		cd-gpios = <&gpio 58 0>; /* gpio PH2 */
+		wp-gpios = <&gpio 59 0>; /* gpio PH3 */
+		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 	};
 };
diff --git a/arch/arm/boot/dts/tegra-seaboard.dts b/arch/arm/boot/dts/tegra-seaboard.dts
index 1940cae..64cedca 100644
--- a/arch/arm/boot/dts/tegra-seaboard.dts
+++ b/arch/arm/boot/dts/tegra-seaboard.dts
@@ -21,8 +21,8 @@
 	};
 
 	sdhci@c8000400 {
-		gpios = <&gpio 69 0>, /* cd, gpio PI5 */
-			<&gpio 57 0>, /* wp, gpio PH1 */
-			<&gpio 70 0>; /* power, gpio PI6 */
+		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
+		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
+		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 	};
 };
-- 
1.7.0.4

Re: [PATCH 2/2] arm/dt: Tegra: Update SDHCI nodes to match bindings

[Olof Johansson]

On Tue, Aug 23, 2011 at 11:15 AM, Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> wrote:
> The bindings were recently updated to be more in-line with other SDHCI
> bindings that are already merged.
>
> Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Acked-by: Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>

Re: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Olof Johansson]

On Tue, Aug 23, 2011 at 11:15 AM, Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> wrote:
> From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
>
> Add hooks to read gpio configuration out of the device tree node.
>
> [grant.likely: Rewrite of original patch from John Bonesio]
> Signed-off-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
> [swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly]
> [swarren: Reworked to avoid #ifdef CONFIG_OF]
> [swarren: Reworked binding based on fsl-imx-esdhc.txt]
> [swarren: Documented binding]
> Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Acked-by: Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>


-Olof

Re: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Marc Dietich]

Hi,

just a small question,

> From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>

[...]

> diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt new file mode
> 100644
> index 0000000..c87f667
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> @@ -0,0 +1,25 @@
> +* NVIDIA Tegra Secure Digital Host Controller
> +
> +This controller on Tegra family SoCs provides an interface for MMC, SD,
> +and SDIO types of memory cards.
> +
> +Required properties:
> +- compatible : Should be "nvidia,<chip>-sdhci"
> +- reg : Should contain eSDHC registers location and length
> +- interrupts : Should contain eSDHC interrupt
> +
> +Optional properties:
> +- cd-gpios : Specify GPIOs for card detection
> +- wp-gpios : Specify GPIOs for write protection
> +- power-gpios : Specify GPIOs for power control
> +
> +Example:
> +
> +sdhci@c8000200 {
> +	compatible = "nvidia,tegra20-sdhci";
> +	reg = <0xc8000200 0x200>;
> +	interrupts = <47>;
> +	cd-gpios = <&gpio 69 0>; /* gpio PI5 */
> +	wp-gpios = <&gpio 57 0>; /* gpio PH1 */
> +	power-gpios = <&gpio 155 0>; /* gpio PT3 */
> +};
> diff --git a/drivers/mmc/host/sdhci-tegra.c
> b/drivers/mmc/host/sdhci-tegra.c index a5a9a97..9ab18d6 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -17,6 +17,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/clk.h>
>  #include <linux/io.h>
> +#include <linux/of_gpio.h>
>  #include <linux/gpio.h>
>  #include <linux/mmc/card.h>
>  #include <linux/mmc/host.h>
> @@ -74,10 +75,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host,
> u32 val, int reg)
> 
>  static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
>  {
> -	struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
> -	struct tegra_sdhci_platform_data *plat;
> -
> -	plat = pdev->dev.platform_data;
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
> +	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
> 
>  	if (!gpio_is_valid(plat->wp_gpio))
>  		return -1;
> @@ -95,12 +94,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
> 
>  static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
>  {
> -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> -	struct tegra_sdhci_platform_data *plat;
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
>  	u32 ctrl;
> 
> -	plat = pdev->dev.platform_data;
> -
>  	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
>  	if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
>  		ctrl &= ~SDHCI_CTRL_4BITBUS;

what about 8 bit support? 

> @@ -132,6 +129,34 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
>  	.ops  = &tegra_sdhci_ops,
>  };
> 
> +static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
> +	{ .compatible = "nvidia,tegra20-sdhci", },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
> +
> +static struct tegra_sdhci_platform_data * __devinit
> sdhci_tegra_dt_parse_pdata( +						struct platform_device *pdev)
> +{
> +	struct tegra_sdhci_platform_data *plat;
> +	struct device_node *np = pdev->dev.of_node;
> +
> +	if (!np)
> +		return NULL;
> +
> +	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
> +	if (!plat) {
> +		dev_err(&pdev->dev, "Can't allocate platform data\n");
> +		return NULL;
> +	}
> +
> +	plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
> +	plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
> +	plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
> +
> +	return plat;
> +}

[...]

RE: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Stephen Warren]

Marc Dietich wrote at Tuesday, August 30, 2011 1:52 AM:
...
> > diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
...
> > @@ -95,12 +94,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
> >
> >  static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
> >  {
> > -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> > -	struct tegra_sdhci_platform_data *plat;
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
> >  	u32 ctrl;
> >
> > -	plat = pdev->dev.platform_data;
> > -
> >  	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> >  	if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
> >  		ctrl &= ~SDHCI_CTRL_4BITBUS;
> 
> what about 8 bit support?

I didn't understand the question at first; I assume you're asking about
8-bit support in the device-tree binding/parsing.

Yes, that's a missing feature, and I should add it. Thanks for pointing
that out.

(I'll also fix the binding docs issue that Shawn pointed out while I'm
at it).

-- 
nvpublic

Re: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Shawn Guo]

On Tue, Aug 23, 2011 at 12:15:33PM -0600, Stephen Warren wrote:
> From: Grant Likely <grant.likely@secretlab.ca>
> 
> Add hooks to read gpio configuration out of the device tree node.
> 
> [grant.likely: Rewrite of original patch from John Bonesio]
> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
> [swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly]
> [swarren: Reworked to avoid #ifdef CONFIG_OF]
> [swarren: Reworked binding based on fsl-imx-esdhc.txt]
> [swarren: Documented binding]
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> Theoretically, these two patches should be merged in order in one place,
> since the 2nd logically depends on the first. However, it's really just
> a documentation dependency, so I think it's fine to merge them into the
> MMC and DT trees separately and let them meet in linux-next.
> 
>  .../devicetree/bindings/mmc/nvidia-sdhci.txt       |   25 ++++++++++
>  drivers/mmc/host/sdhci-tegra.c                     |   51 +++++++++++++++----
>  2 files changed, 65 insertions(+), 11 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> 
> diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> new file mode 100644
> index 0000000..c87f667
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> @@ -0,0 +1,25 @@
> +* NVIDIA Tegra Secure Digital Host Controller
> +
> +This controller on Tegra family SoCs provides an interface for MMC, SD,
> +and SDIO types of memory cards.
> +
> +Required properties:
> +- compatible : Should be "nvidia,<chip>-sdhci"
> +- reg : Should contain eSDHC registers location and length
> +- interrupts : Should contain eSDHC interrupt

You may want to replace eSDHC with something Tegra specific.

-- 
Regards,
Shawn

RE: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Stephen Warren]

Shawn Guo wrote at Monday, August 29, 2011 9:41 PM:
> On Tue, Aug 23, 2011 at 12:15:33PM -0600, Stephen Warren wrote:
> > From: Grant Likely <grant.likely@secretlab.ca>
> >
> > Add hooks to read gpio configuration out of the device tree node.
...
> > diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
...
> > +* NVIDIA Tegra Secure Digital Host Controller
> > +
> > +This controller on Tegra family SoCs provides an interface for MMC, SD,
> > +and SDIO types of memory cards.
> > +
> > +Required properties:
> > +- compatible : Should be "nvidia,<chip>-sdhci"
> > +- reg : Should contain eSDHC registers location and length
> > +- interrupts : Should contain eSDHC interrupt
> 
> You may want to replace eSDHC with something Tegra specific.

True. The patch is already submitted. Do you think it's worth posting one
just to fix that; it still seems pretty clear what's required?

Thanks.

-- 
nvpublic

Re: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support

[Shawn Guo]

On Tue, Aug 30, 2011 at 09:01:37AM -0700, Stephen Warren wrote:
> Shawn Guo wrote at Monday, August 29, 2011 9:41 PM:
> > On Tue, Aug 23, 2011 at 12:15:33PM -0600, Stephen Warren wrote:
> > > From: Grant Likely <grant.likely@secretlab.ca>
> > >
> > > Add hooks to read gpio configuration out of the device tree node.
> ...
> > > diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> ...
> > > +* NVIDIA Tegra Secure Digital Host Controller
> > > +
> > > +This controller on Tegra family SoCs provides an interface for MMC, SD,
> > > +and SDIO types of memory cards.
> > > +
> > > +Required properties:
> > > +- compatible : Should be "nvidia,<chip>-sdhci"
> > > +- reg : Should contain eSDHC registers location and length
> > > +- interrupts : Should contain eSDHC interrupt
> > 
> > You may want to replace eSDHC with something Tegra specific.
> 
> True. The patch is already submitted. Do you think it's worth posting one
> just to fix that;

It's totally your call.

Regards,
Shawn

> it still seems pretty clear what's required?
>