[PATCH v3 0/4] gpio/xilinx: Add support for PCI mapped devices and rmmod

[PATCH v3 0/4] gpio/xilinx: Add support for PCI mapped devices and rmmod

[Ricardo Ribalda Delgado]

The main purpose of this patchset is to use the driver on a PCI mapped fpga.

This patchset also converts the driver to platform device, so it will support
hot plugged devices and rmmod.

Changeset:

v3
Suggested by Michal Simek <michal.simek@xilinx.com>
-Add patch for fixing kernel-doc
-Leave the driver at subsys_initcall


v2
Suggested by Alexandre Courbot <gnurou@gmail.com>
Merge 2 and 3 (convert to platform device and implement remove)


Ricardo Ribalda Delgado (4):
  gpio/xilinx: Remove offset property
  gpio/xilinx: Convert the driver to platform device interface
  gpio/xilinx: Add support for X86 Arch
  gpio/xilinx: Fix kernel-doc

 drivers/gpio/Kconfig       |   4 +-
 drivers/gpio/gpio-xilinx.c | 148 ++++++++++++++++++++++++++++-----------------
 2 files changed, 94 insertions(+), 58 deletions(-)

-- 
2.1.3

[PATCH v3 1/4] gpio/xilinx: Remove offset property

[Ricardo Ribalda Delgado]

Instead of calculating the register offset per call, pre-calculate it on
probe time.

Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---

v3: Remove offset from kernel-doc

 drivers/gpio/gpio-xilinx.c | 34 +++++++++++-----------------------
 1 file changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index ba18b06..e668ec4 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -43,14 +43,12 @@
  * struct of_mm_gpio_chip mmchip: OF GPIO chip for memory mapped banks
  * gpio_state: GPIO state shadow register
  * gpio_dir: GPIO direction shadow register
- * offset: GPIO channel offset
  * gpio_lock: Lock used for synchronization
  */
 struct xgpio_instance {
 	struct of_mm_gpio_chip mmchip;
 	u32 gpio_state;
 	u32 gpio_dir;
-	u32 offset;
 	spinlock_t gpio_lock;
 };
 
@@ -65,12 +63,8 @@ struct xgpio_instance {
 static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct xgpio_instance *chip =
-	    container_of(mm_gc, struct xgpio_instance, mmchip);
 
-	void __iomem *regs = mm_gc->regs + chip->offset;
-
-	return !!(xgpio_readreg(regs + XGPIO_DATA_OFFSET) & BIT(gpio));
+	return !!(xgpio_readreg(mm_gc->regs + XGPIO_DATA_OFFSET) & BIT(gpio));
 }
 
 /**
@@ -88,7 +82,6 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct xgpio_instance *chip =
 	    container_of(mm_gc, struct xgpio_instance, mmchip);
-	void __iomem *regs = mm_gc->regs;
 
 	spin_lock_irqsave(&chip->gpio_lock, flags);
 
@@ -98,8 +91,7 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	else
 		chip->gpio_state &= ~BIT(gpio);
 
-	xgpio_writereg(regs + chip->offset + XGPIO_DATA_OFFSET,
-							 chip->gpio_state);
+	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET, chip->gpio_state);
 
 	spin_unlock_irqrestore(&chip->gpio_lock, flags);
 }
@@ -119,13 +111,12 @@ static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct xgpio_instance *chip =
 	    container_of(mm_gc, struct xgpio_instance, mmchip);
-	void __iomem *regs = mm_gc->regs;
 
 	spin_lock_irqsave(&chip->gpio_lock, flags);
 
 	/* Set the GPIO bit in shadow register and set direction as input */
 	chip->gpio_dir |= BIT(gpio);
-	xgpio_writereg(regs + chip->offset + XGPIO_TRI_OFFSET, chip->gpio_dir);
+	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir);
 
 	spin_unlock_irqrestore(&chip->gpio_lock, flags);
 
@@ -148,7 +139,6 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct xgpio_instance *chip =
 	    container_of(mm_gc, struct xgpio_instance, mmchip);
-	void __iomem *regs = mm_gc->regs;
 
 	spin_lock_irqsave(&chip->gpio_lock, flags);
 
@@ -157,12 +147,11 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 		chip->gpio_state |= BIT(gpio);
 	else
 		chip->gpio_state &= ~BIT(gpio);
-	xgpio_writereg(regs + chip->offset + XGPIO_DATA_OFFSET,
-		       chip->gpio_state);
+	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET, chip->gpio_state);
 
 	/* Clear the GPIO bit in shadow register and set direction as output */
 	chip->gpio_dir &= ~BIT(gpio);
-	xgpio_writereg(regs + chip->offset + XGPIO_TRI_OFFSET, chip->gpio_dir);
+	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir);
 
 	spin_unlock_irqrestore(&chip->gpio_lock, flags);
 
@@ -178,10 +167,8 @@ static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
 	struct xgpio_instance *chip =
 	    container_of(mm_gc, struct xgpio_instance, mmchip);
 
-	xgpio_writereg(mm_gc->regs + chip->offset + XGPIO_DATA_OFFSET,
-							chip->gpio_state);
-	xgpio_writereg(mm_gc->regs + chip->offset + XGPIO_TRI_OFFSET,
-							 chip->gpio_dir);
+	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET,	chip->gpio_state);
+	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir);
 }
 
 /**
@@ -247,9 +234,6 @@ static int xgpio_of_probe(struct device_node *np)
 		if (!chip)
 			return -ENOMEM;
 
-		/* Add dual channel offset */
-		chip->offset = XGPIO_CHANNEL_OFFSET;
-
 		/* Update GPIO state shadow register with default value */
 		of_property_read_u32(np, "xlnx,dout-default-2",
 				     &chip->gpio_state);
@@ -285,6 +269,10 @@ static int xgpio_of_probe(struct device_node *np)
 			np->full_name, status);
 			return status;
 		}
+
+		/* Add dual channel offset */
+		chip->mmchip.regs += XGPIO_CHANNEL_OFFSET;
+
 		pr_info("XGpio: %s: dual channel registered, base is %d\n",
 					np->full_name, chip->mmchip.gc.base);
 	}
-- 
2.1.3

[PATCH v3 2/4] gpio/xilinx: Convert the driver to platform device interface

[Ricardo Ribalda Delgado]

This way we do not need to transverse the device tree manually and we
support hot plugged devices.

Also Implement remove callback so the driver can be unloaded

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---

v3:
Add inited to kernel-doc
Keep the driver in susbys_initcall


 drivers/gpio/gpio-xilinx.c | 77 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 60 insertions(+), 17 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index e668ec4..9a81c82 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -44,12 +44,18 @@
  * gpio_state: GPIO state shadow register
  * gpio_dir: GPIO direction shadow register
  * gpio_lock: Lock used for synchronization
+ * inited: True if the port has been inited
  */
 struct xgpio_instance {
 	struct of_mm_gpio_chip mmchip;
 	u32 gpio_state;
 	u32 gpio_dir;
 	spinlock_t gpio_lock;
+	bool inited;
+};
+
+struct xgpio {
+	struct xgpio_instance port[2];
 };
 
 /**
@@ -172,24 +178,56 @@ static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
 }
 
 /**
+ * xgpio_remove - Remove method for the GPIO device.
+ * @pdev: pointer to the platform device
+ *
+ * This function remove gpiochips and frees all the allocated resources.
+ */
+static int xgpio_remove(struct platform_device *pdev)
+{
+	struct xgpio *xgpio = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		if (!xgpio->port[i].inited)
+			continue;
+		gpiochip_remove(&xgpio->port[i].mmchip.gc);
+
+		if (i == 1)
+			xgpio->port[i].mmchip.regs -= XGPIO_CHANNEL_OFFSET;
+
+		iounmap(xgpio->port[i].mmchip.regs);
+		kfree(xgpio->port[i].mmchip.gc.label);
+	}
+
+	return 0;
+}
+
+/**
  * xgpio_of_probe - Probe method for the GPIO device.
- * @np: pointer to device tree node
+ * @pdev: pointer to the platform device
  *
  * This function probes the GPIO device in the device tree. It initializes the
  * driver data structure. It returns 0, if the driver is bound to the GPIO
  * device, or a negative value if there is an error.
  */
-static int xgpio_of_probe(struct device_node *np)
+static int xgpio_probe(struct platform_device *pdev)
 {
+	struct xgpio *xgpio;
 	struct xgpio_instance *chip;
 	int status = 0;
+	struct device_node *np = pdev->dev.of_node;
 	const u32 *tree_info;
 	u32 ngpio;
 
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-	if (!chip)
+	xgpio = devm_kzalloc(&pdev->dev, sizeof(*xgpio), GFP_KERNEL);
+	if (!xgpio)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, xgpio);
+
+	chip = &xgpio->port[0];
+
 	/* Update GPIO state shadow register with default value */
 	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state);
 
@@ -209,6 +247,7 @@ static int xgpio_of_probe(struct device_node *np)
 
 	spin_lock_init(&chip->gpio_lock);
 
+	chip->mmchip.gc.dev = &pdev->dev;
 	chip->mmchip.gc.direction_input = xgpio_dir_in;
 	chip->mmchip.gc.direction_output = xgpio_dir_out;
 	chip->mmchip.gc.get = xgpio_get;
@@ -219,20 +258,18 @@ static int xgpio_of_probe(struct device_node *np)
 	/* Call the OF gpio helper to setup and register the GPIO device */
 	status = of_mm_gpiochip_add(np, &chip->mmchip);
 	if (status) {
-		kfree(chip);
 		pr_err("%s: error in probe function with status %d\n",
 		       np->full_name, status);
 		return status;
 	}
+	chip->inited = true;
 
 	pr_info("XGpio: %s: registered, base is %d\n", np->full_name,
 							chip->mmchip.gc.base);
 
 	tree_info = of_get_property(np, "xlnx,is-dual", NULL);
 	if (tree_info && be32_to_cpup(tree_info)) {
-		chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-		if (!chip)
-			return -ENOMEM;
+		chip = &xgpio->port[1];
 
 		/* Update GPIO state shadow register with default value */
 		of_property_read_u32(np, "xlnx,dout-default-2",
@@ -254,6 +291,7 @@ static int xgpio_of_probe(struct device_node *np)
 
 		spin_lock_init(&chip->gpio_lock);
 
+		chip->mmchip.gc.dev = &pdev->dev;
 		chip->mmchip.gc.direction_input = xgpio_dir_in;
 		chip->mmchip.gc.direction_output = xgpio_dir_out;
 		chip->mmchip.gc.get = xgpio_get;
@@ -264,7 +302,7 @@ static int xgpio_of_probe(struct device_node *np)
 		/* Call the OF gpio helper to setup and register the GPIO dev */
 		status = of_mm_gpiochip_add(np, &chip->mmchip);
 		if (status) {
-			kfree(chip);
+			xgpio_remove(pdev);
 			pr_err("%s: error in probe function with status %d\n",
 			np->full_name, status);
 			return status;
@@ -272,6 +310,7 @@ static int xgpio_of_probe(struct device_node *np)
 
 		/* Add dual channel offset */
 		chip->mmchip.regs += XGPIO_CHANNEL_OFFSET;
+		chip->inited = true;
 
 		pr_info("XGpio: %s: dual channel registered, base is %d\n",
 					np->full_name, chip->mmchip.gc.base);
@@ -285,19 +324,23 @@ static const struct of_device_id xgpio_of_match[] = {
 	{ /* end of list */ },
 };
 
-static int __init xgpio_init(void)
-{
-	struct device_node *np;
+MODULE_DEVICE_TABLE(of, xgpio_of_match);
 
-	for_each_matching_node(np, xgpio_of_match)
-		xgpio_of_probe(np);
+static struct platform_driver xgpio_plat_driver = {
+	.probe		= xgpio_probe,
+	.remove		= xgpio_remove,
+	.driver		= {
+			.name = "gpio-xilinx",
+			.of_match_table	= xgpio_of_match,
+	},
+};
 
-	return 0;
+static int __init xgpio_init(void)
+{
+	return platform_driver_register(&xgpio_plat_driver);
 }
 
-/* Make sure we get initialized before anyone else tries to use us */
 subsys_initcall(xgpio_init);
-/* No exit call at the moment as we cannot unregister of GPIO chips */
 
 MODULE_AUTHOR("Xilinx, Inc.");
 MODULE_DESCRIPTION("Xilinx GPIO driver");
-- 
2.1.3

Re: [PATCH v3 2/4] gpio/xilinx: Convert the driver to platform device interface

[Michal Simek]

On 12/10/2014 04:24 PM, Ricardo Ribalda Delgado wrote:
> This way we do not need to transverse the device tree manually and we
> support hot plugged devices.
> 
> Also Implement remove callback so the driver can be unloaded
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
> ---
> 
> v3:
> Add inited to kernel-doc
> Keep the driver in susbys_initcall
> 
> 
>  drivers/gpio/gpio-xilinx.c | 77 ++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 60 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index e668ec4..9a81c82 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -44,12 +44,18 @@
>   * gpio_state: GPIO state shadow register
>   * gpio_dir: GPIO direction shadow register
>   * gpio_lock: Lock used for synchronization
> + * inited: True if the port has been inited
>   */
>  struct xgpio_instance {
>  	struct of_mm_gpio_chip mmchip;
>  	u32 gpio_state;
>  	u32 gpio_dir;
>  	spinlock_t gpio_lock;
> +	bool inited;
> +};
> +
> +struct xgpio {
> +	struct xgpio_instance port[2];
>  };
>  
>  /**
> @@ -172,24 +178,56 @@ static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
>  }
>  
>  /**
> + * xgpio_remove - Remove method for the GPIO device.
> + * @pdev: pointer to the platform device
> + *
> + * This function remove gpiochips and frees all the allocated resources.
> + */
> +static int xgpio_remove(struct platform_device *pdev)
> +{
> +	struct xgpio *xgpio = platform_get_drvdata(pdev);
> +	int i;
> +
> +	for (i = 0; i < 2; i++) {
> +		if (!xgpio->port[i].inited)
> +			continue;
> +		gpiochip_remove(&xgpio->port[i].mmchip.gc);
> +
> +		if (i == 1)
> +			xgpio->port[i].mmchip.regs -= XGPIO_CHANNEL_OFFSET;
> +
> +		iounmap(xgpio->port[i].mmchip.regs);
> +		kfree(xgpio->port[i].mmchip.gc.label);
> +	}
> +
> +	return 0;
> +}
> +
> +/**
>   * xgpio_of_probe - Probe method for the GPIO device.
> - * @np: pointer to device tree node
> + * @pdev: pointer to the platform device
>   *
>   * This function probes the GPIO device in the device tree. It initializes the
>   * driver data structure. It returns 0, if the driver is bound to the GPIO
>   * device, or a negative value if there is an error.
>   */
> -static int xgpio_of_probe(struct device_node *np)
> +static int xgpio_probe(struct platform_device *pdev)
>  {
> +	struct xgpio *xgpio;
>  	struct xgpio_instance *chip;
>  	int status = 0;
> +	struct device_node *np = pdev->dev.of_node;
>  	const u32 *tree_info;
>  	u32 ngpio;
>  
> -	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
> -	if (!chip)
> +	xgpio = devm_kzalloc(&pdev->dev, sizeof(*xgpio), GFP_KERNEL);
> +	if (!xgpio)
>  		return -ENOMEM;
>  
> +	platform_set_drvdata(pdev, xgpio);
> +
> +	chip = &xgpio->port[0];
> +
>  	/* Update GPIO state shadow register with default value */
>  	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state);
>  
> @@ -209,6 +247,7 @@ static int xgpio_of_probe(struct device_node *np)
>  
>  	spin_lock_init(&chip->gpio_lock);
>  
> +	chip->mmchip.gc.dev = &pdev->dev;
>  	chip->mmchip.gc.direction_input = xgpio_dir_in;
>  	chip->mmchip.gc.direction_output = xgpio_dir_out;
>  	chip->mmchip.gc.get = xgpio_get;
> @@ -219,20 +258,18 @@ static int xgpio_of_probe(struct device_node *np)
>  	/* Call the OF gpio helper to setup and register the GPIO device */
>  	status = of_mm_gpiochip_add(np, &chip->mmchip);
>  	if (status) {
> -		kfree(chip);
>  		pr_err("%s: error in probe function with status %d\n",
>  		       np->full_name, status);
>  		return status;
>  	}
> +	chip->inited = true;
>  
>  	pr_info("XGpio: %s: registered, base is %d\n", np->full_name,
>  							chip->mmchip.gc.base);
>  
>  	tree_info = of_get_property(np, "xlnx,is-dual", NULL);
>  	if (tree_info && be32_to_cpup(tree_info)) {
> -		chip = kzalloc(sizeof(*chip), GFP_KERNEL);
> -		if (!chip)
> -			return -ENOMEM;
> +		chip = &xgpio->port[1];
>  
>  		/* Update GPIO state shadow register with default value */
>  		of_property_read_u32(np, "xlnx,dout-default-2",
> @@ -254,6 +291,7 @@ static int xgpio_of_probe(struct device_node *np)
>  
>  		spin_lock_init(&chip->gpio_lock);
>  
> +		chip->mmchip.gc.dev = &pdev->dev;
>  		chip->mmchip.gc.direction_input = xgpio_dir_in;
>  		chip->mmchip.gc.direction_output = xgpio_dir_out;
>  		chip->mmchip.gc.get = xgpio_get;
> @@ -264,7 +302,7 @@ static int xgpio_of_probe(struct device_node *np)
>  		/* Call the OF gpio helper to setup and register the GPIO dev */
>  		status = of_mm_gpiochip_add(np, &chip->mmchip);
>  		if (status) {
> -			kfree(chip);
> +			xgpio_remove(pdev);
>  			pr_err("%s: error in probe function with status %d\n",
>  			np->full_name, status);
>  			return status;
> @@ -272,6 +310,7 @@ static int xgpio_of_probe(struct device_node *np)
>  
>  		/* Add dual channel offset */
>  		chip->mmchip.regs += XGPIO_CHANNEL_OFFSET;
> +		chip->inited = true;
>  
>  		pr_info("XGpio: %s: dual channel registered, base is %d\n",
>  					np->full_name, chip->mmchip.gc.base);
> @@ -285,19 +324,23 @@ static const struct of_device_id xgpio_of_match[] = {
>  	{ /* end of list */ },
>  };
>  
> -static int __init xgpio_init(void)
> -{
> -	struct device_node *np;
> +MODULE_DEVICE_TABLE(of, xgpio_of_match);
>  
> -	for_each_matching_node(np, xgpio_of_match)
> -		xgpio_of_probe(np);
> +static struct platform_driver xgpio_plat_driver = {
> +	.probe		= xgpio_probe,
> +	.remove		= xgpio_remove,
> +	.driver		= {
> +			.name = "gpio-xilinx",
> +			.of_match_table	= xgpio_of_match,
> +	},
> +};
>  
> -	return 0;
> +static int __init xgpio_init(void)
> +{
> +	return platform_driver_register(&xgpio_plat_driver);
>  }
>  
> -/* Make sure we get initialized before anyone else tries to use us */
>  subsys_initcall(xgpio_init);
> -/* No exit call at the moment as we cannot unregister of GPIO chips */
>  

Still not correct.
Here should be module_exit if you want to use as module.
I expect that you haven't tested it.

Thanks,
Michal

Re: [PATCH v3 2/4] gpio/xilinx: Convert the driver to platform device interface

[Ricardo Ribalda Delgado]

>
> Still not correct.
Not my day.

> Here should be module_exit if you want to use as module.
> I expect that you haven't tested it.


No, I only tried the original patchset, I assumed this was just
cosmetic changes ;)

Right now I have tested it  :P

 to attach helpers instead.
[  199.175954] XGpio: /axi1/gpio_0: registered, base is 509
[  242.362202] gpio-xilinx 80040000.gpio_0: REMOVING GPIOCHIP WITH
GPIOS STILL REQUESTED
[  242.362218] gpio-xilinx 80040000.gpio_0: REMOVING GPIOCHIP WITH
GPIOS STILL REQUESTED
[  242.362222] gpio-xilinx 80040000.gpio_0: REMOVING GPIOCHIP WITH
GPIOS STILL REQUESTED


I am resending only this patch to avoid spamming the list


>
> Thanks,

Thank you!


> Michal
>
>



-- 
Ricardo Ribalda

[PATCH v3 3/4] gpio/xilinx: Add support for X86 Arch

[Ricardo Ribalda Delgado]

Core can be accessed via PCIe on X86 platform.
This patch also allows the driver to be used as module.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
v3: Fix log message

 drivers/gpio/Kconfig       | 4 ++--
 drivers/gpio/gpio-xilinx.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0959ca9..7f8ba83 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -343,8 +343,8 @@ config GPIO_XGENE
 	  here to enable the GFC GPIO functionality.
 
 config GPIO_XILINX
-	bool "Xilinx GPIO support"
-	depends on PPC_OF || MICROBLAZE || ARCH_ZYNQ
+	tristate "Xilinx GPIO support"
+	depends on OF_GPIO && (PPC_OF || MICROBLAZE || ARCH_ZYNQ || ARCH_X86)
 	help
 	  Say yes here to support the Xilinx FPGA GPIO device
 
diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 9a81c82..0607d97 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -30,7 +30,7 @@
 #define XGPIO_CHANNEL_OFFSET	0x8
 
 /* Read/Write access to the GPIO registers */
-#ifdef CONFIG_ARCH_ZYNQ
+#if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86)
 # define xgpio_readreg(offset)		readl(offset)
 # define xgpio_writereg(offset, val)	writel(val, offset)
 #else
-- 
2.1.3

[PATCH v3 4/4] gpio/xilinx: Fix kernel-doc

[Ricardo Ribalda Delgado]

Some documentation were not following the kernel-doc format.
Backporting patch from Xilinx git repository.

Suggested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---

v4: New patch

 drivers/gpio/gpio-xilinx.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 0607d97..0297003 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -40,11 +40,11 @@
 
 /**
  * struct xgpio_instance - Stores information about GPIO device
- * struct of_mm_gpio_chip mmchip: OF GPIO chip for memory mapped banks
- * gpio_state: GPIO state shadow register
- * gpio_dir: GPIO direction shadow register
- * gpio_lock: Lock used for synchronization
- * inited: True if the port has been inited
+ * @mmchip: OF GPIO chip for memory mapped banks
+ * @gpio_state: GPIO state shadow register
+ * @gpio_dir: GPIO direction shadow register
+ * @gpio_lock: Lock used for synchronization
+ * @inited: True if the port has been inited
  */
 struct xgpio_instance {
 	struct of_mm_gpio_chip mmchip;
@@ -63,8 +63,11 @@ struct xgpio {
  * @gc:     Pointer to gpio_chip device structure.
  * @gpio:   GPIO signal number.
  *
- * This function reads the specified signal of the GPIO device. It returns 0 if
- * the signal clear, 1 if signal is set or negative value on error.
+ * This function reads the specified signal of the GPIO device.
+ *
+ * Return:
+ * 0 if direction of GPIO signals is set as input otherwise it
+ * returns negative error value.
  */
 static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
@@ -107,9 +110,9 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  * @gc:     Pointer to gpio_chip device structure.
  * @gpio:   GPIO signal number.
  *
- * This function sets the direction of specified GPIO signal as input.
- * It returns 0 if direction of GPIO signals is set as input otherwise it
- * returns negative error value.
+ * Return:
+ * 0 - if direction of GPIO signals is set as input
+ * otherwise it returns negative error value.
  */
 static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
@@ -135,8 +138,10 @@ static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
  * @gpio:   GPIO signal number.
  * @val:    Value to be written to specified signal.
  *
- * This function sets the direction of specified GPIO signal as output. If all
- * GPIO signals of GPIO chip is configured as input then it returns
+ * This function sets the direction of specified GPIO signal as output.
+ *
+ * Return:
+ * If all GPIO signals of GPIO chip is configured as input then it returns
  * error otherwise it returns 0.
  */
 static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
@@ -166,7 +171,7 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 
 /**
  * xgpio_save_regs - Set initial values of GPIO pins
- * @mm_gc: pointer to memory mapped GPIO chip structure
+ * @mm_gc: Pointer to memory mapped GPIO chip structure
  */
 static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
 {
@@ -207,9 +212,9 @@ static int xgpio_remove(struct platform_device *pdev)
  * xgpio_of_probe - Probe method for the GPIO device.
  * @pdev: pointer to the platform device
  *
- * This function probes the GPIO device in the device tree. It initializes the
- * driver data structure. It returns 0, if the driver is bound to the GPIO
- * device, or a negative value if there is an error.
+ * Return:
+ * It returns 0, if the driver is bound to the GPIO device, or
+ * a negative value if there is an error.
  */
 static int xgpio_probe(struct platform_device *pdev)
 {
-- 
2.1.3

Re: [PATCH v3 4/4] gpio/xilinx: Fix kernel-doc

[Alexandre Courbot]

On Thu, Dec 11, 2014 at 12:25 AM, Ricardo Ribalda Delgado
<ricardo.ribalda@gmail.com> wrote:
> Some documentation were not following the kernel-doc format.
> Backporting patch from Xilinx git repository.
>
> Suggested-by: Michal Simek <michal.simek@xilinx.com>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>

Acked-by: Alexandre Courbot <acourbot@nvidia.com>