Patchwork pci-rcar-gen2: add device tree support

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Submitter Sergei Shtylyov
Date April 7, 2014, 9:41 p.m.
Message ID <201404080141.21605.sergei.shtylyov@cogentembedded.com>
Download mbox | patch
Permalink /patch/337542/
State Changes Requested
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Comments

Sergei Shtylyov - April 7, 2014, 9:41 p.m.
From: Ben Dooks <ben.dooks@codethink.co.uk>

Add device tree probing support to the 'pci-rcar-gen2' driver.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
[Sergei: numerous fixes/cleanups]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
The patch is against the 'next' branch of Bjorn Helgaas' 'pci.git' repo.

Changes in version 3:
- added "renesas,pci-r8a7791" to the possible "compatible" property values;
- removed '#ifdef CONFIG_OF' around rcar_pci_of_match[] and hence of_match_ptr()
  invocation too;
- fixed trailing whitespace in the DT parsing code;
- removed the wrong "renessas," prefix from the binding document's file name;
- moved the PCI device sub-nodes from the board example to the SoC example;
- fixed labels in the board example;
- fixed grammar and punctuation in the binding document;
- reworded the changelog, fixed the subject.

Changes in version 2:
- merged the binding document from a separate patch;
- moved to the "bus-range" property parsing;
- added example to the binding document.

 Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt |   54 ++++++++++++++++
 drivers/pci/host/pci-rcar-gen2.c                        |   32 ++++++++-
 2 files changed, 84 insertions(+), 2 deletions(-)

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Bjorn Helgaas - April 25, 2014, 5:45 p.m.
On Tue, Apr 08, 2014 at 01:41:20AM +0400, Sergei Shtylyov wrote:
> From: Ben Dooks <ben.dooks@codethink.co.uk>
> 
> Add device tree probing support to the 'pci-rcar-gen2' driver.
> 
> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
> [Sergei: numerous fixes/cleanups]
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

I'm OK with this, but it needs an ack from Simon.

> ---
> The patch is against the 'next' branch of Bjorn Helgaas' 'pci.git' repo.
> 
> Changes in version 3:
> - added "renesas,pci-r8a7791" to the possible "compatible" property values;
> - removed '#ifdef CONFIG_OF' around rcar_pci_of_match[] and hence of_match_ptr()
>   invocation too;
> - fixed trailing whitespace in the DT parsing code;
> - removed the wrong "renessas," prefix from the binding document's file name;
> - moved the PCI device sub-nodes from the board example to the SoC example;
> - fixed labels in the board example;
> - fixed grammar and punctuation in the binding document;
> - reworded the changelog, fixed the subject.
> 
> Changes in version 2:
> - merged the binding document from a separate patch;
> - moved to the "bus-range" property parsing;
> - added example to the binding document.
> 
>  Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt |   54 ++++++++++++++++
>  drivers/pci/host/pci-rcar-gen2.c                        |   32 ++++++++-
>  2 files changed, 84 insertions(+), 2 deletions(-)
> 
> Index: pci/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> ===================================================================
> --- /dev/null
> +++ pci/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> @@ -0,0 +1,54 @@
> +Renesas AHB to PCI bridge
> +-------------------------
> +
> +This is the bridge used internally to connect the USB controllers to the
> +AHB. There is one bridge instance per USB port connected to the internal
> +OHCI and EHCI controllers.
> +
> +Required properties:
> +- compatible: "renesas,pci-r8a7790" for the R8A7790 SoC;
> +	      "renesas,pci-r8a7791" for the R8A7791 SoC.
> +- reg:	A list of physical regions to access the device: the first is
> +	the operational registers for the OHCI/EHCI controllers and the
> +	second is for the bridge configuration and control registers.
> +- interrupts: interrupt for the device.
> +- clocks: The reference to the device clock.
> +- bus-range: The PCI bus number range; as this is a single bus, the range
> +	      should be specified as the same value twice.
> +
> +Example SoC configuration:
> +
> +	pci0: pci@ee090000  {
> +		compatible = "renesas,pci-r8a7790";
> +		clocks = <&mstp7_clks R8A7790_CLK_EHCI>;
> +		reg = <0x0 0xee090000 0x0 0xc00>,
> +		      <0x0 0xee080000 0x0 0x1100>;
> +		interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>;
> +		status = "disabled";
> +
> +		bus-range = <0 0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +
> +		pci@0,1 {
> +			reg = <0x800 0 0 0 0>;
> +			device_type = "pci";
> +			phys = <&usbphy 0 0>;
> +			phy-names = "usb";
> +		};
> +
> +		pci@0,2 {
> +			reg = <0x1000 0 0 0 0>;
> +			device_type = "pci";
> +			phys = <&usbphy 0 0>;
> +			phy-names = "usb";
> +		};
> +	};
> +
> +Example board setup:
> +
> +&pci0 {
> +	status = "okay";
> +	pinctrl-0 = <&usb0_pins>;
> +	pinctrl-names = "default";
> +};
> Index: pci/drivers/pci/host/pci-rcar-gen2.c
> ===================================================================
> --- pci.orig/drivers/pci/host/pci-rcar-gen2.c
> +++ pci/drivers/pci/host/pci-rcar-gen2.c
> @@ -16,6 +16,7 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/pci.h>
> +#include <linux/of_pci.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/sizes.h>
> @@ -98,6 +99,7 @@ struct rcar_pci_priv {
>  	struct resource io_res;
>  	struct resource mem_res;
>  	struct resource *cfg_res;
> +	unsigned busnr;
>  	int irq;
>  	unsigned long window_size;
>  };
> @@ -312,8 +314,8 @@ static int rcar_pci_setup(int nr, struct
>  	pci_add_resource(&sys->resources, &priv->io_res);
>  	pci_add_resource(&sys->resources, &priv->mem_res);
>  
> -	/* Setup bus number based on platform device id */
> -	sys->busnr = to_platform_device(priv->dev)->id;
> +	/* Setup bus number based on platform device id / of bus-range */
> +	sys->busnr = priv->busnr;
>  	return 1;
>  }
>  
> @@ -366,6 +368,23 @@ static int rcar_pci_probe(struct platfor
>  
>  	priv->window_size = SZ_1G;
>  
> +	if (pdev->dev.of_node) {
> +		struct resource busnr;
> +		int ret;
> +
> +		ret = of_pci_parse_bus_range(pdev->dev.of_node, &busnr);
> +		if (ret < 0) {
> +			dev_err(&pdev->dev, "failed to parse bus-range\n");
> +			return ret;
> +		}
> +
> +		priv->busnr = busnr.start;
> +		if (busnr.end != busnr.start)
> +			dev_warn(&pdev->dev, "only one bus number supported\n");
> +	} else {
> +		priv->busnr = pdev->id;
> +	}
> +
>  	hw_private[0] = priv;
>  	memset(&hw, 0, sizeof(hw));
>  	hw.nr_controllers = ARRAY_SIZE(hw_private);
> @@ -377,11 +396,20 @@ static int rcar_pci_probe(struct platfor
>  	return 0;
>  }
>  
> +static struct of_device_id rcar_pci_of_match[] = {
> +	{ .compatible = "renesas,pci-r8a7790", },
> +	{ .compatible = "renesas,pci-r8a7791", },
> +	{ },
> +};
> +
> +MODULE_DEVICE_TABLE(of, rcar_pci_of_match);
> +
>  static struct platform_driver rcar_pci_driver = {
>  	.driver = {
>  		.name = "pci-rcar-gen2",
>  		.owner = THIS_MODULE,
>  		.suppress_bind_attrs = true,
> +		.of_match_table = rcar_pci_of_match,
>  	},
>  	.probe = rcar_pci_probe,
>  };
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Arnd Bergmann - April 25, 2014, 8:05 p.m.
On Friday 25 April 2014 11:45:35 Bjorn Helgaas wrote:
> > +This is the bridge used internally to connect the USB controllers to the
> > +AHB. There is one bridge instance per USB port connected to the internal
> > +OHCI and EHCI controllers.
> > +
> > +Required properties:
> > +- compatible: "renesas,pci-r8a7790" for the R8A7790 SoC;
> > +           "renesas,pci-r8a7791" for the R8A7791 SoC.
> > +- reg:       A list of physical regions to access the device: the first is
> > +     the operational registers for the OHCI/EHCI controllers and the
> > +     second is for the bridge configuration and control registers.
> > +- interrupts: interrupt for the device.
> > +- clocks: The reference to the device clock.
> > +- bus-range: The PCI bus number range; as this is a single bus, the range
> > +           should be specified as the same value twice.

Actually, this doesn't conform to the generic PCI binding, which requires
a number of additional properties.

	Arnd
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Patch

Index: pci/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
===================================================================
--- /dev/null
+++ pci/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
@@ -0,0 +1,54 @@ 
+Renesas AHB to PCI bridge
+-------------------------
+
+This is the bridge used internally to connect the USB controllers to the
+AHB. There is one bridge instance per USB port connected to the internal
+OHCI and EHCI controllers.
+
+Required properties:
+- compatible: "renesas,pci-r8a7790" for the R8A7790 SoC;
+	      "renesas,pci-r8a7791" for the R8A7791 SoC.
+- reg:	A list of physical regions to access the device: the first is
+	the operational registers for the OHCI/EHCI controllers and the
+	second is for the bridge configuration and control registers.
+- interrupts: interrupt for the device.
+- clocks: The reference to the device clock.
+- bus-range: The PCI bus number range; as this is a single bus, the range
+	      should be specified as the same value twice.
+
+Example SoC configuration:
+
+	pci0: pci@ee090000  {
+		compatible = "renesas,pci-r8a7790";
+		clocks = <&mstp7_clks R8A7790_CLK_EHCI>;
+		reg = <0x0 0xee090000 0x0 0xc00>,
+		      <0x0 0xee080000 0x0 0x1100>;
+		interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>;
+		status = "disabled";
+
+		bus-range = <0 0>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+
+		pci@0,1 {
+			reg = <0x800 0 0 0 0>;
+			device_type = "pci";
+			phys = <&usbphy 0 0>;
+			phy-names = "usb";
+		};
+
+		pci@0,2 {
+			reg = <0x1000 0 0 0 0>;
+			device_type = "pci";
+			phys = <&usbphy 0 0>;
+			phy-names = "usb";
+		};
+	};
+
+Example board setup:
+
+&pci0 {
+	status = "okay";
+	pinctrl-0 = <&usb0_pins>;
+	pinctrl-names = "default";
+};
Index: pci/drivers/pci/host/pci-rcar-gen2.c
===================================================================
--- pci.orig/drivers/pci/host/pci-rcar-gen2.c
+++ pci/drivers/pci/host/pci-rcar-gen2.c
@@ -16,6 +16,7 @@ 
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/of_pci.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/sizes.h>
@@ -98,6 +99,7 @@  struct rcar_pci_priv {
 	struct resource io_res;
 	struct resource mem_res;
 	struct resource *cfg_res;
+	unsigned busnr;
 	int irq;
 	unsigned long window_size;
 };
@@ -312,8 +314,8 @@  static int rcar_pci_setup(int nr, struct
 	pci_add_resource(&sys->resources, &priv->io_res);
 	pci_add_resource(&sys->resources, &priv->mem_res);
 
-	/* Setup bus number based on platform device id */
-	sys->busnr = to_platform_device(priv->dev)->id;
+	/* Setup bus number based on platform device id / of bus-range */
+	sys->busnr = priv->busnr;
 	return 1;
 }
 
@@ -366,6 +368,23 @@  static int rcar_pci_probe(struct platfor
 
 	priv->window_size = SZ_1G;
 
+	if (pdev->dev.of_node) {
+		struct resource busnr;
+		int ret;
+
+		ret = of_pci_parse_bus_range(pdev->dev.of_node, &busnr);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to parse bus-range\n");
+			return ret;
+		}
+
+		priv->busnr = busnr.start;
+		if (busnr.end != busnr.start)
+			dev_warn(&pdev->dev, "only one bus number supported\n");
+	} else {
+		priv->busnr = pdev->id;
+	}
+
 	hw_private[0] = priv;
 	memset(&hw, 0, sizeof(hw));
 	hw.nr_controllers = ARRAY_SIZE(hw_private);
@@ -377,11 +396,20 @@  static int rcar_pci_probe(struct platfor
 	return 0;
 }
 
+static struct of_device_id rcar_pci_of_match[] = {
+	{ .compatible = "renesas,pci-r8a7790", },
+	{ .compatible = "renesas,pci-r8a7791", },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, rcar_pci_of_match);
+
 static struct platform_driver rcar_pci_driver = {
 	.driver = {
 		.name = "pci-rcar-gen2",
 		.owner = THIS_MODULE,
 		.suppress_bind_attrs = true,
+		.of_match_table = rcar_pci_of_match,
 	},
 	.probe = rcar_pci_probe,
 };