diff mbox

[RFC/PATCH,v2,2/2] gpio-rcar: Add DT support

Message ID 1369136406-23800-3-git-send-email-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State Superseded
Commit 159f8a0209aff155af7f6fcdedd4a4484dd19c23
Headers show

Commit Message

Laurent Pinchart May 21, 2013, 11:40 a.m. UTC 
Add DT bindings for the gpio-rcar driver and read the device
configuration from the DT node at probe time if available.

Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 .../devicetree/bindings/gpio/renesas,gpio-rcar.txt | 52 +++++++++++++++++
 drivers/gpio/gpio-rcar.c                           | 66 ++++++++++++++++++----
 2 files changed, 108 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt

Comments

Linus Walleij May 30, 2013, 5:38 p.m. UTC | #1 
On Tue, May 21, 2013 at 1:40 PM, Laurent Pinchart
<laurent.pinchart+renesas@ideasonboard.com> wrote:

> Add DT bindings for the gpio-rcar driver and read the device
> configuration from the DT node at probe time if available.
>
> Cc: devicetree-discuss@lists.ozlabs.org
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Acked-by: Linus Walleij <linus.walleij@linaro.org>

I am assuming this will go through Simon's tree?

Note:

> +  - gpio-ranges: Range of pins managed by the GPIO controller as a 4-cells
> +    tuple using the following syntax.
> +
> +    <[phandle of the pin controller node]
> +     0
> +     [index of the first pin]
> +     [number of pins]>
> +
> +Please refer to gpio.txt in this directory for details of the common GPIO
> +bindings used by client devices.

The above ranges are part of that document.

Yours,
Linus Walleij
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Laurent Pinchart May 31, 2013, 1:20 a.m. UTC | #2 
Hi Linus,

On Thursday 30 May 2013 19:38:12 Linus Walleij wrote:
> On Tue, May 21, 2013 at 1:40 PM, Laurent Pinchart
> <laurent.pinchart+renesas@ideasonboard.com> wrote:
> > Add DT bindings for the gpio-rcar driver and read the device
> > configuration from the DT node at probe time if available.
> > 
> > Cc: devicetree-discuss@lists.ozlabs.org
> > Signed-off-by: Laurent Pinchart
> > <laurent.pinchart+renesas@ideasonboard.com>
> 
> Acked-by: Linus Walleij <linus.walleij@linaro.org>
> 
> I am assuming this will go through Simon's tree?

I've so far pushed GPIO and pinctrl patches for SH through Simon's tree due to 
the many cross-dependencies between SH arch code and the GPIO and pinctrl 
drivers. As the situation now stabilizes, we could now push the patches 
through their respective subsystem trees.

Simon, Linus, any opinion/preference on that ?

> Note:
> > +  - gpio-ranges: Range of pins managed by the GPIO controller as a
> > 4-cells
> > +    tuple using the following syntax.
> > +
> > +    <[phandle of the pin controller node]
> > +     0
> > +     [index of the first pin]
> > +     [number of pins]>
> > +
> > +Please refer to gpio.txt in this directory for details of the common GPIO
> > +bindings used by client devices.
> 
> The above ranges are part of that document.

What about replacing that with

  - gpio-ranges: Range of pins managed by the GPIO controller.

Please refer to gpio.txt in this directory for details of gpio-ranges property 
and the common GPIO bindings used by client devices.
Linus Walleij May 31, 2013, 7:01 a.m. UTC | #3 
On Fri, May 31, 2013 at 3:20 AM, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:

> I've so far pushed GPIO and pinctrl patches for SH through Simon's tree due to
> the many cross-dependencies between SH arch code and the GPIO and pinctrl
> drivers. As the situation now stabilizes, we could now push the patches
> through their respective subsystem trees.
>
> Simon, Linus, any opinion/preference on that ?

Depends, if they are still large patch sets I'd prefer Simon to
take it, but once the drivers are in place and going to maintenance
mode I'll handle them in pinctrl.

>> The above ranges are part of that document.
>
> What about replacing that with
>
>   - gpio-ranges: Range of pins managed by the GPIO controller.
>
> Please refer to gpio.txt in this directory for details of gpio-ranges property
> and the common GPIO bindings used by client devices.

Go for it!

Yours,
Linus Walleij
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Laurent Pinchart May 31, 2013, 7:32 a.m. UTC | #4 
Hi Linus,

On Friday 31 May 2013 09:01:44 Linus Walleij wrote:
> On Fri, May 31, 2013 at 3:20 AM, Laurent Pinchart wrote:
> > I've so far pushed GPIO and pinctrl patches for SH through Simon's tree
> > due to the many cross-dependencies between SH arch code and the GPIO and
> > pinctrl drivers. As the situation now stabilizes, we could now push the
> > patches through their respective subsystem trees.
> > 
> > Simon, Linus, any opinion/preference on that ?
> 
> Depends, if they are still large patch sets I'd prefer Simon to
> take it, but once the drivers are in place and going to maintenance
> mode I'll handle them in pinctrl.

Let's make the switch for v3.12 then if that's fine with you.

> >> The above ranges are part of that document.
> > 
> > What about replacing that with
> > 
> >   - gpio-ranges: Range of pins managed by the GPIO controller.
> > 
> > Please refer to gpio.txt in this directory for details of gpio-ranges
> > property and the common GPIO bindings used by client devices.
> 
> Go for it!

Thanks.
Grant Likely June 12, 2013, 11:49 a.m. UTC | #5 
On Tue, 21 May 2013 13:40:06 +0200, Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> wrote:
> Add DT bindings for the gpio-rcar driver and read the device
> configuration from the DT node at probe time if available.
> 
> Cc: devicetree-discuss@lists.ozlabs.org
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>  .../devicetree/bindings/gpio/renesas,gpio-rcar.txt | 52 +++++++++++++++++
>  drivers/gpio/gpio-rcar.c                           | 66 ++++++++++++++++++----
>  2 files changed, 108 insertions(+), 10 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
> new file mode 100644
> index 0000000..46d76a0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
> @@ -0,0 +1,52 @@
> +* Renesas R-Car GPIO Controller
> +
> +Required Properties:
> +
> +  - compatible: should be one of the following.
> +    - "renesas,gpio-r8a7778": for R8A7778 (R-Mobile M1) compatible GPIO controller.
> +    - "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
> +    - "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller.
> +    - "renesas,gpio-rcar": for generic R-Car GPIO controller.
> +
> +  - reg: Base address and length of each memory resource used by the GPIO
> +    controller hardware module.
> +
> +  - interrupt-parent: phandle of the parent interrupt controller.
> +  - interrupts: Interrupt specifier for the controllers interrupt.
> +
> +  - gpio-controller: Marks the device node as a gpio controller.
> +  - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
> +    cell is used to specify optional parameters as bit flags. Only the GPIO
> +    active low flag (bit 0) is currently supported.
> +  - gpio-ranges: Range of pins managed by the GPIO controller as a 4-cells
> +    tuple using the following syntax.
> +
> +    <[phandle of the pin controller node]
> +     0
> +     [index of the first pin]
> +     [number of pins]>
> +
> +Please refer to gpio.txt in this directory for details of the common GPIO
> +bindings used by client devices.
> +
> +Example: R8A7779 (R-Car H1) GPIO controller nodes
> +
> +	gpio0: gpio@ffc40000 {
> +		compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
> +		reg = <0xffc40000 0x2c>;
> +		interrupt-parent = <&gic>;
> +		interrupts = <0 141 0x4>;
> +		#gpio-cells = <2>;
> +		gpio-controller;
> +		gpio-ranges = <&pfc 0 0 32>;
> +	};
> +	...
> +	gpio6: gpio@ffc46000 {
> +		compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
> +		reg = <0xffc46000 0x2c>;
> +		interrupt-parent = <&gic>;
> +		interrupts = <0 147 0x4>;
> +		#gpio-cells = <2>;
> +		gpio-controller;
> +		gpio-ranges = <&pfc 0 192 9>;
> +	};
> diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
> index 0f3d647..c153837 100644
> --- a/drivers/gpio/gpio-rcar.c
> +++ b/drivers/gpio/gpio-rcar.c
> @@ -50,6 +50,8 @@ struct gpio_rcar_priv {
>  #define EDGLEVEL 0x24
>  #define FILONOFF 0x28
>  
> +#define RCAR_MAX_GPIO_PER_BANK		32
> +
>  static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
>  {
>  	return ioread32(p->base + offs);
> @@ -258,9 +260,39 @@ static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
>  	.map	= gpio_rcar_irq_domain_map,
>  };
>  
> +static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
> +{
> +	struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
> +#ifdef CONFIG_OF
> +	struct device_node *np = p->pdev->dev.of_node;
> +	struct of_phandle_args args;
> +	int ret;
> +#endif
> +
> +	if (pdata)
> +		p->config = *pdata;
> +#ifdef CONFIG_OF
> +	else if (np) {

Try this:
	else if ((IS_ENABLED(CONFIG_OF)) && np) {

It's much better than adding #ifdef blocks to .c files. In v3.11 a bunch
of the OF forward declarations get pulled out from under the #ifdef
block so that you can use the above construct.

> +		ret = of_parse_phandle_with_args(np, "gpio-ranges",
> +				"#gpio-range-cells", 0, &args);
> +		p->config.number_of_pins = ret == 0 && args.args_count == 3
> +					 ? args.args[2]
> +					 : RCAR_MAX_GPIO_PER_BANK;
> +		p->config.gpio_base = -1;
> +	}
> +#endif
> +
> +	if (p->config.number_of_pins == 0 ||
> +	    p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
> +		dev_warn(&p->pdev->dev,
> +			 "Invalid number of gpio lines %u, using %u\n",
> +			 p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
> +		p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
> +	}
> +}
> +
>  static int gpio_rcar_probe(struct platform_device *pdev)
>  {
> -	struct gpio_rcar_config *pdata = pdev->dev.platform_data;
>  	struct gpio_rcar_priv *p;
>  	struct resource *io, *irq;
>  	struct gpio_chip *gpio_chip;
> @@ -275,14 +307,14 @@ static int gpio_rcar_probe(struct platform_device *pdev)
>  		goto err0;
>  	}
>  
> -	/* deal with driver instance configuration */
> -	if (pdata)
> -		p->config = *pdata;
> -
>  	p->pdev = pdev;
> -	platform_set_drvdata(pdev, p);
>  	spin_lock_init(&p->lock);
>  
> +	/* Get device configuration from DT node or platform data. */
> +	gpio_rcar_parse_pdata(p);
> +
> +	platform_set_drvdata(pdev, p);
> +
>  	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>  
> @@ -309,6 +341,7 @@ static int gpio_rcar_probe(struct platform_device *pdev)
>  	gpio_chip->set = gpio_rcar_set;
>  	gpio_chip->to_irq = gpio_rcar_to_irq;
>  	gpio_chip->label = name;
> +	gpio_chip->dev = &pdev->dev;
>  	gpio_chip->owner = THIS_MODULE;
>  	gpio_chip->base = p->config.gpio_base;
>  	gpio_chip->ngpio = p->config.number_of_pins;
> @@ -355,10 +388,12 @@ static int gpio_rcar_probe(struct platform_device *pdev)
>  				 p->config.irq_base, ret);
>  	}
>  
> -	ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
> -				     gpio_chip->base, gpio_chip->ngpio);
> -	if (ret < 0)
> -		dev_warn(&pdev->dev, "failed to add pin range\n");
> +	if (p->config.pctl_name) {
> +		ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
> +					     gpio_chip->base, gpio_chip->ngpio);
> +		if (ret < 0)
> +			dev_warn(&pdev->dev, "failed to add pin range\n");
> +	}
>  
>  	return 0;
>  
> @@ -381,11 +416,22 @@ static int gpio_rcar_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id gpio_rcar_of_table[] = {
> +	{
> +		.compatible = "renesas,gpio-rcar",
> +	},
> +};
> +
> +MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
> +#endif
> +
>  static struct platform_driver gpio_rcar_device_driver = {
>  	.probe		= gpio_rcar_probe,
>  	.remove		= gpio_rcar_remove,
>  	.driver		= {
>  		.name	= "gpio_rcar",
> +		.of_match_table = of_match_ptr(gpio_rcar_of_table),
>  	}
>  };
>  
> -- 
> 1.8.1.5
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
Laurent Pinchart June 13, 2013, 5:08 p.m. UTC | #6 
Hi Grant,

Thanks for the review.

On Wednesday 12 June 2013 12:49:11 Grant Likely wrote:
> On Tue, 21 May 2013 13:40:06 +0200, Laurent Pinchart wrote:
> > Add DT bindings for the gpio-rcar driver and read the device
> > configuration from the DT node at probe time if available.
> > 
> > Cc: devicetree-discuss@lists.ozlabs.org
> > Signed-off-by: Laurent Pinchart
> > <laurent.pinchart+renesas@ideasonboard.com>
> > ---
> > 
> >  .../devicetree/bindings/gpio/renesas,gpio-rcar.txt | 52 +++++++++++++++++
> >  drivers/gpio/gpio-rcar.c                           | 66 ++++++++++++++---
> >  2 files changed, 108 insertions(+), 10 deletions(-)
> >  create mode 100644
> >  Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt

[snip]

> > diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
> > index 0f3d647..c153837 100644
> > --- a/drivers/gpio/gpio-rcar.c
> > +++ b/drivers/gpio/gpio-rcar.c

[snip]

> > +static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
> > +{
> > +	struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
> > +#ifdef CONFIG_OF
> > +	struct device_node *np = p->pdev->dev.of_node;
> > +	struct of_phandle_args args;
> > +	int ret;
> > +#endif
> > +
> > +	if (pdata)
> > +		p->config = *pdata;
> > +#ifdef CONFIG_OF
> > +	else if (np) {
> 
> Try this:
> 	else if ((IS_ENABLED(CONFIG_OF)) && np) {
> 
> It's much better than adding #ifdef blocks to .c files. In v3.11 a bunch
> of the OF forward declarations get pulled out from under the #ifdef
> block so that you can use the above construct.

As a pull request has already been sent to the ARM SoC maintainers, and given 
that this isn't a critical issue, I'll address it as a follow-up patch if 
that's fine with you.

> > +		ret = of_parse_phandle_with_args(np, "gpio-ranges",
> > +				"#gpio-range-cells", 0, &args);
> > +		p->config.number_of_pins = ret == 0 && args.args_count == 3
> > +					 ? args.args[2]
> > +					 : RCAR_MAX_GPIO_PER_BANK;
> > +		p->config.gpio_base = -1;
> > +	}
> > +#endif
> > +
> > +	if (p->config.number_of_pins == 0 ||
> > +	    p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
> > +		dev_warn(&p->pdev->dev,
> > +			 "Invalid number of gpio lines %u, using %u\n",
> > +			 p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
> > +		p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
> > +	}
> > +}
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
new file mode 100644
index 0000000..46d76a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
@@ -0,0 +1,52 @@ 
+* Renesas R-Car GPIO Controller
+
+Required Properties:
+
+  - compatible: should be one of the following.
+    - "renesas,gpio-r8a7778": for R8A7778 (R-Mobile M1) compatible GPIO controller.
+    - "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
+    - "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller.
+    - "renesas,gpio-rcar": for generic R-Car GPIO controller.
+
+  - reg: Base address and length of each memory resource used by the GPIO
+    controller hardware module.
+
+  - interrupt-parent: phandle of the parent interrupt controller.
+  - interrupts: Interrupt specifier for the controllers interrupt.
+
+  - gpio-controller: Marks the device node as a gpio controller.
+  - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
+    cell is used to specify optional parameters as bit flags. Only the GPIO
+    active low flag (bit 0) is currently supported.
+  - gpio-ranges: Range of pins managed by the GPIO controller as a 4-cells
+    tuple using the following syntax.
+
+    <[phandle of the pin controller node]
+     0
+     [index of the first pin]
+     [number of pins]>
+
+Please refer to gpio.txt in this directory for details of the common GPIO
+bindings used by client devices.
+
+Example: R8A7779 (R-Car H1) GPIO controller nodes
+
+	gpio0: gpio@ffc40000 {
+		compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
+		reg = <0xffc40000 0x2c>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 141 0x4>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		gpio-ranges = <&pfc 0 0 32>;
+	};
+	...
+	gpio6: gpio@ffc46000 {
+		compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
+		reg = <0xffc46000 0x2c>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 147 0x4>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		gpio-ranges = <&pfc 0 192 9>;
+	};
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 0f3d647..c153837 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -50,6 +50,8 @@  struct gpio_rcar_priv {
 #define EDGLEVEL 0x24
 #define FILONOFF 0x28
 
+#define RCAR_MAX_GPIO_PER_BANK		32
+
 static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
 {
 	return ioread32(p->base + offs);
@@ -258,9 +260,39 @@  static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
 	.map	= gpio_rcar_irq_domain_map,
 };
 
+static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
+{
+	struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
+#ifdef CONFIG_OF
+	struct device_node *np = p->pdev->dev.of_node;
+	struct of_phandle_args args;
+	int ret;
+#endif
+
+	if (pdata)
+		p->config = *pdata;
+#ifdef CONFIG_OF
+	else if (np) {
+		ret = of_parse_phandle_with_args(np, "gpio-ranges",
+				"#gpio-range-cells", 0, &args);
+		p->config.number_of_pins = ret == 0 && args.args_count == 3
+					 ? args.args[2]
+					 : RCAR_MAX_GPIO_PER_BANK;
+		p->config.gpio_base = -1;
+	}
+#endif
+
+	if (p->config.number_of_pins == 0 ||
+	    p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
+		dev_warn(&p->pdev->dev,
+			 "Invalid number of gpio lines %u, using %u\n",
+			 p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
+		p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
+	}
+}
+
 static int gpio_rcar_probe(struct platform_device *pdev)
 {
-	struct gpio_rcar_config *pdata = pdev->dev.platform_data;
 	struct gpio_rcar_priv *p;
 	struct resource *io, *irq;
 	struct gpio_chip *gpio_chip;
@@ -275,14 +307,14 @@  static int gpio_rcar_probe(struct platform_device *pdev)
 		goto err0;
 	}
 
-	/* deal with driver instance configuration */
-	if (pdata)
-		p->config = *pdata;
-
 	p->pdev = pdev;
-	platform_set_drvdata(pdev, p);
 	spin_lock_init(&p->lock);
 
+	/* Get device configuration from DT node or platform data. */
+	gpio_rcar_parse_pdata(p);
+
+	platform_set_drvdata(pdev, p);
+
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 
@@ -309,6 +341,7 @@  static int gpio_rcar_probe(struct platform_device *pdev)
 	gpio_chip->set = gpio_rcar_set;
 	gpio_chip->to_irq = gpio_rcar_to_irq;
 	gpio_chip->label = name;
+	gpio_chip->dev = &pdev->dev;
 	gpio_chip->owner = THIS_MODULE;
 	gpio_chip->base = p->config.gpio_base;
 	gpio_chip->ngpio = p->config.number_of_pins;
@@ -355,10 +388,12 @@  static int gpio_rcar_probe(struct platform_device *pdev)
 				 p->config.irq_base, ret);
 	}
 
-	ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
-				     gpio_chip->base, gpio_chip->ngpio);
-	if (ret < 0)
-		dev_warn(&pdev->dev, "failed to add pin range\n");
+	if (p->config.pctl_name) {
+		ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
+					     gpio_chip->base, gpio_chip->ngpio);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "failed to add pin range\n");
+	}
 
 	return 0;
 
@@ -381,11 +416,22 @@  static int gpio_rcar_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id gpio_rcar_of_table[] = {
+	{
+		.compatible = "renesas,gpio-rcar",
+	},
+};
+
+MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
+#endif
+
 static struct platform_driver gpio_rcar_device_driver = {
 	.probe		= gpio_rcar_probe,
 	.remove		= gpio_rcar_remove,
 	.driver		= {
 		.name	= "gpio_rcar",
+		.of_match_table = of_match_ptr(gpio_rcar_of_table),
 	}
 };