[PATCH 0/3 v3] USB: host: Add Device tree support for ohci-exynos & ehci-s5p

[PATCH 0/3 v3] USB: host: Add Device tree support for ohci-exynos & ehci-s5p

[Vivek Gautam]

Changes from v1:
1) Moved "struct of_device_id exynos_ehci_match[]"
to the next of "struct dev_pm_ops s5p_ehci_pm_ops" in ehci-s5p.c.
2) Rebased on 'usb-next' branch.

Vivek Gautam (3):
  USB: ohci-exynos: Add support for device tree
  USB: ehci-s5p: Add support for device tree
  USB: ehci-s5p: Add vbus setup function to the s5p ehci glue layer

 drivers/usb/host/ehci-s5p.c    |   47 ++++++++++++++++++++++++++++++++++++++++
 drivers/usb/host/ohci-exynos.c |   22 ++++++++++++++++++
 2 files changed, 69 insertions(+), 0 deletions(-)

[PATCH 1/3 v3] USB: ohci-exynos: Add support for device tree

[Vivek Gautam]

This patch adds support to parse probe data for
ohci driver for exynos using device tree.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index 8bcbdb5..fc3091b 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <mach/ohci.h>
 #include <plat/usb-phy.h>
@@ -71,6 +72,8 @@ static const struct hc_driver exynos_ohci_hc_driver = {
 	.start_port_reset	= ohci_start_port_reset,
 };
 
+static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
+
 static int __devinit exynos_ohci_probe(struct platform_device *pdev)
 {
 	struct exynos4_ohci_platdata *pdata;
@@ -87,6 +90,16 @@ static int __devinit exynos_ohci_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	/*
+	 * Right now device-tree probed devices don't get dma_mask set.
+	 * Since shared usb code relies on it, set it here for now.
+	 * Once we move to full device tree support this will vanish off.
+	 */
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &ohci_exynos_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
 	exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 					GFP_KERNEL);
 	if (!exynos_ohci)
@@ -256,6 +269,14 @@ static const struct dev_pm_ops exynos_ohci_pm_ops = {
 	.resume		= exynos_ohci_resume,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ohci_match[] = {
+	{ .compatible = "samsung,exynos-ohci" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_ohci_match);
+#endif
+
 static struct platform_driver exynos_ohci_driver = {
 	.probe		= exynos_ohci_probe,
 	.remove		= __devexit_p(exynos_ohci_remove),
@@ -264,6 +285,7 @@ static struct platform_driver exynos_ohci_driver = {
 		.name	= "exynos-ohci",
 		.owner	= THIS_MODULE,
 		.pm	= &exynos_ohci_pm_ops,
+		.of_match_table	= of_match_ptr(exynos_ohci_match),
 	}
 };
 
-- 
1.7.0.4

Re: [PATCH 1/3 v3] USB: ohci-exynos: Add support for device tree

[Jingoo Han]

On Monday, July 16, 2012 2:56 PM, Vivek Gautam wrote:
> 
> This patch adds support to parse probe data for
> ohci driver for exynos using device tree.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: Abhilash Kesavan <a.kesavan-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

Acked-by: Jingoo Han <jg1.han-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

> 
> diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> index 8bcbdb5..fc3091b 100644
> --- a/drivers/usb/host/ohci-exynos.c
> +++ b/drivers/usb/host/ohci-exynos.c
> @@ -12,6 +12,7 @@
>   */
> 
>  #include <linux/clk.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <mach/ohci.h>
>  #include <plat/usb-phy.h>
> @@ -71,6 +72,8 @@ static const struct hc_driver exynos_ohci_hc_driver = {
>  	.start_port_reset	= ohci_start_port_reset,
>  };
> 
> +static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
> +
>  static int __devinit exynos_ohci_probe(struct platform_device *pdev)
>  {
>  	struct exynos4_ohci_platdata *pdata;
> @@ -87,6 +90,16 @@ static int __devinit exynos_ohci_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
> 
> +	/*
> +	 * Right now device-tree probed devices don't get dma_mask set.
> +	 * Since shared usb code relies on it, set it here for now.
> +	 * Once we move to full device tree support this will vanish off.
> +	 */
> +	if (!pdev->dev.dma_mask)
> +		pdev->dev.dma_mask = &ohci_exynos_dma_mask;
> +	if (!pdev->dev.coherent_dma_mask)
> +		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +
>  	exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
>  					GFP_KERNEL);
>  	if (!exynos_ohci)
> @@ -256,6 +269,14 @@ static const struct dev_pm_ops exynos_ohci_pm_ops = {
>  	.resume		= exynos_ohci_resume,
>  };
> 
> +#ifdef CONFIG_OF
> +static const struct of_device_id exynos_ohci_match[] = {
> +	{ .compatible = "samsung,exynos-ohci" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, exynos_ohci_match);
> +#endif
> +
>  static struct platform_driver exynos_ohci_driver = {
>  	.probe		= exynos_ohci_probe,
>  	.remove		= __devexit_p(exynos_ohci_remove),
> @@ -264,6 +285,7 @@ static struct platform_driver exynos_ohci_driver = {
>  		.name	= "exynos-ohci",
>  		.owner	= THIS_MODULE,
>  		.pm	= &exynos_ohci_pm_ops,
> +		.of_match_table	= of_match_ptr(exynos_ohci_match),
>  	}
>  };
> 
> --
> 1.7.0.4

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Re: [PATCH 1/3 v3] USB: ohci-exynos: Add support for device tree

[Alan Stern]

On Mon, 16 Jul 2012, Vivek Gautam wrote:

> This patch adds support to parse probe data for
> ohci driver for exynos using device tree.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

Acked-by: Alan Stern <stern@rowland.harvard.edu>

[PATCH 2/3 v3] USB: ehci-s5p: Add support for device tree

[Vivek Gautam]

This patch adds support to parse probe data for
ehci driver for exynos using device tree

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index 13c179f..37d84cf 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -13,6 +13,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <plat/ehci.h>
 #include <plat/usb-phy.h>
@@ -63,6 +64,8 @@ static const struct hc_driver s5p_ehci_hc_driver = {
 	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
 };
 
+static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
+
 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
 {
 	struct s5p_ehci_platdata *pdata;
@@ -79,6 +82,16 @@ static int __devinit s5p_ehci_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	/*
+	 * Right now device-tree probed devices don't get dma_mask set.
+	 * Since shared usb code relies on it, set it here for now.
+	 * Once we move to full device tree support this will vanish off.
+	 */
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &ehci_s5p_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
 	s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
 				GFP_KERNEL);
 	if (!s5p_ehci)
@@ -233,6 +246,14 @@ static const struct dev_pm_ops s5p_ehci_pm_ops = {
 	.resume		= s5p_ehci_resume,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ehci_match[] = {
+	{ .compatible = "samsung,exynos-ehci" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_ehci_match);
+#endif
+
 static struct platform_driver s5p_ehci_driver = {
 	.probe		= s5p_ehci_probe,
 	.remove		= __devexit_p(s5p_ehci_remove),
@@ -241,6 +262,7 @@ static struct platform_driver s5p_ehci_driver = {
 		.name	= "s5p-ehci",
 		.owner	= THIS_MODULE,
 		.pm	= &s5p_ehci_pm_ops,
+		.of_match_table = of_match_ptr(exynos_ehci_match),
 	}
 };
 
-- 
1.7.0.4

Re: [PATCH 2/3 v3] USB: ehci-s5p: Add support for device tree

[Jingoo Han]

On Monday, July 16, 2012 2:56 PM, Vivek Gautam wrote:
> 
> This patch adds support to parse probe data for
> ehci driver for exynos using device tree
> 
> Signed-off-by: Thomas Abraham <thomas.abraham-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: Abhilash Kesavan <a.kesavan-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

Acked-by: Jingoo Han <jg1.han-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

> 
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 13c179f..37d84cf 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -13,6 +13,7 @@
>   */
> 
>  #include <linux/clk.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <plat/ehci.h>
>  #include <plat/usb-phy.h>
> @@ -63,6 +64,8 @@ static const struct hc_driver s5p_ehci_hc_driver = {
>  	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
>  };
> 
> +static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
> +
>  static int __devinit s5p_ehci_probe(struct platform_device *pdev)
>  {
>  	struct s5p_ehci_platdata *pdata;
> @@ -79,6 +82,16 @@ static int __devinit s5p_ehci_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
> 
> +	/*
> +	 * Right now device-tree probed devices don't get dma_mask set.
> +	 * Since shared usb code relies on it, set it here for now.
> +	 * Once we move to full device tree support this will vanish off.
> +	 */
> +	if (!pdev->dev.dma_mask)
> +		pdev->dev.dma_mask = &ehci_s5p_dma_mask;
> +	if (!pdev->dev.coherent_dma_mask)
> +		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +
>  	s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
>  				GFP_KERNEL);
>  	if (!s5p_ehci)
> @@ -233,6 +246,14 @@ static const struct dev_pm_ops s5p_ehci_pm_ops = {
>  	.resume		= s5p_ehci_resume,
>  };
> 
> +#ifdef CONFIG_OF
> +static const struct of_device_id exynos_ehci_match[] = {
> +	{ .compatible = "samsung,exynos-ehci" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, exynos_ehci_match);
> +#endif
> +
>  static struct platform_driver s5p_ehci_driver = {
>  	.probe		= s5p_ehci_probe,
>  	.remove		= __devexit_p(s5p_ehci_remove),
> @@ -241,6 +262,7 @@ static struct platform_driver s5p_ehci_driver = {
>  		.name	= "s5p-ehci",
>  		.owner	= THIS_MODULE,
>  		.pm	= &s5p_ehci_pm_ops,
> +		.of_match_table = of_match_ptr(exynos_ehci_match),
>  	}
>  };
> 
> --
> 1.7.0.4

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Re: [PATCH 2/3 v3] USB: ehci-s5p: Add support for device tree

[Alan Stern]

On Mon, 16 Jul 2012, Vivek Gautam wrote:

> This patch adds support to parse probe data for
> ehci driver for exynos using device tree
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

Acked-by: Alan Stern <stern@rowland.harvard.edu>

[PATCH 3/3 v3] USB: ehci-s5p: Add vbus setup function to the s5p ehci glue layer

[Vivek Gautam]

This patch retrieves and configures the vbus control gpio via
the device tree. The suspend/resume callbacks will be later
modified for vbus control.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index 37d84cf..4037878 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -15,6 +15,7 @@
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/of_gpio.h>
 #include <plat/ehci.h>
 #include <plat/usb-phy.h>
 
@@ -64,6 +65,28 @@ static const struct hc_driver s5p_ehci_hc_driver = {
 	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
 };
 
+static int s5p_ehci_setup_gpio(struct platform_device *pdev)
+{
+	int err;
+	int gpio;
+
+	if (!pdev->dev.of_node)
+		return 0;
+
+	gpio = of_get_named_gpio(pdev->dev.of_node,
+			"samsung,vbus-gpio", 0);
+	if (!gpio_is_valid(gpio))
+		return 0;
+
+	err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
+	if (err) {
+		dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
+		return err;
+	}
+
+	return err;
+}
+
 static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
 
 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
@@ -92,6 +115,8 @@ static int __devinit s5p_ehci_probe(struct platform_device *pdev)
 	if (!pdev->dev.coherent_dma_mask)
 		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
+	s5p_ehci_setup_gpio(pdev);
+
 	s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
 				GFP_KERNEL);
 	if (!s5p_ehci)
-- 
1.7.0.4

Re: [PATCH 3/3 v3] USB: ehci-s5p: Add vbus setup function to the s5p ehci glue layer

[Jingoo Han]

On Monday, July 16, 2012 2:56 PM, Vivek Gautam wrote:
> 
> This patch retrieves and configures the vbus control gpio via
> the device tree. The suspend/resume callbacks will be later
> modified for vbus control.
> 
> Signed-off-by: Abhilash Kesavan <a.kesavan-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

Acked-by: Jingoo Han <jg1.han-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

> 
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 37d84cf..4037878 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -15,6 +15,7 @@
>  #include <linux/clk.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> +#include <linux/of_gpio.h>
>  #include <plat/ehci.h>
>  #include <plat/usb-phy.h>
> 
> @@ -64,6 +65,28 @@ static const struct hc_driver s5p_ehci_hc_driver = {
>  	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
>  };
> 
> +static int s5p_ehci_setup_gpio(struct platform_device *pdev)
> +{
> +	int err;
> +	int gpio;
> +
> +	if (!pdev->dev.of_node)
> +		return 0;
> +
> +	gpio = of_get_named_gpio(pdev->dev.of_node,
> +			"samsung,vbus-gpio", 0);
> +	if (!gpio_is_valid(gpio))
> +		return 0;
> +
> +	err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
> +	if (err) {
> +		dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
> +		return err;
> +	}
> +
> +	return err;
> +}
> +
>  static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
> 
>  static int __devinit s5p_ehci_probe(struct platform_device *pdev)
> @@ -92,6 +115,8 @@ static int __devinit s5p_ehci_probe(struct platform_device *pdev)
>  	if (!pdev->dev.coherent_dma_mask)
>  		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> 
> +	s5p_ehci_setup_gpio(pdev);
> +
>  	s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
>  				GFP_KERNEL);
>  	if (!s5p_ehci)
> --
> 1.7.0.4

Re: [PATCH 3/3 v3] USB: ehci-s5p: Add vbus setup function to the s5p ehci glue layer

[Alan Stern]

On Mon, 16 Jul 2012, Vivek Gautam wrote:

> This patch retrieves and configures the vbus control gpio via
> the device tree. The suspend/resume callbacks will be later
> modified for vbus control.
> 
> Signed-off-by: Abhilash Kesavan <a.kesavan-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> 
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 37d84cf..4037878 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -15,6 +15,7 @@
>  #include <linux/clk.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> +#include <linux/of_gpio.h>
>  #include <plat/ehci.h>
>  #include <plat/usb-phy.h>
>  
> @@ -64,6 +65,28 @@ static const struct hc_driver s5p_ehci_hc_driver = {
>  	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
>  };
>  
> +static int s5p_ehci_setup_gpio(struct platform_device *pdev)
> +{
> +	int err;
> +	int gpio;
> +
> +	if (!pdev->dev.of_node)
> +		return 0;
> +
> +	gpio = of_get_named_gpio(pdev->dev.of_node,
> +			"samsung,vbus-gpio", 0);
> +	if (!gpio_is_valid(gpio))
> +		return 0;
> +
> +	err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
> +	if (err) {
> +		dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
> +		return err;

This "return" statement is unnecessary.

> +	}
> +
> +	return err;
> +}
> +
>  static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
>  
>  static int __devinit s5p_ehci_probe(struct platform_device *pdev)
> @@ -92,6 +115,8 @@ static int __devinit s5p_ehci_probe(struct platform_device *pdev)
>  	if (!pdev->dev.coherent_dma_mask)
>  		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
>  
> +	s5p_ehci_setup_gpio(pdev);

Why does the function return an error code if that error code is just 
going to be ignored?

Alan Stern

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Re: [PATCH 0/3 v3] USB: host: Add Device tree support for ohci-exynos & ehci-s5p

[Greg KH]

On Mon, Jul 16, 2012 at 11:25:35AM +0530, Vivek Gautam wrote:
> Changes from v1:
> 1) Moved "struct of_device_id exynos_ehci_match[]"
> to the next of "struct dev_pm_ops s5p_ehci_pm_ops" in ehci-s5p.c.
> 2) Rebased on 'usb-next' branch.

I've applied the first 2 patches here, please rework the third one.

greg k-h
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