From: Ben Dooks <[email protected]> Add device tree probing support to the 'pci-rcar-gen2' driver.
Signed-off-by: Ben Dooks <[email protected]> [Sergei: numerous fixes/cleanups] Signed-off-by: Sergei Shtylyov <[email protected]> --- 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, }; -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
