Re: [PATCH 1/9] pci-rcar-gen2: add devicetree support

[Bjorn Helgaas <bhelgaas@google.com>]

On Thu, Mar 06, 2014 at 06:01:19PM +0000, Ben Dooks wrote:
> Add OF match table for pci-rcar-gen2 driver for device tree support.
> 
> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>

I'm not sure what the status of this is.  I saw comments about a missing
#include, but I didn't see a fixed repost.  Ben, could you please repost
anything you have outstanding for me?

> ---
> Updates since v1:
> 	- moved documentation into patch
> 	- moved to using bus-range parsing
> 	- ensured usb phy can be linked to usb devices
> 
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Simon Horman <horms@verge.net.au>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-sh@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> ---
>  .../bindings/pci/renessas,pci-rcar-gen2.txt        | 52 ++++++++++++++++++++++
>  drivers/pci/host/pci-rcar-gen2.c                   | 33 +++++++++++++-
>  2 files changed, 83 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/renessas,pci-rcar-gen2.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/renessas,pci-rcar-gen2.txt b/Documentation/devicetree/bindings/pci/renessas,pci-rcar-gen2.txt
> new file mode 100644
> index 0000000..bd6d291
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/renessas,pci-rcar-gen2.txt
> @@ -0,0 +1,52 @@
> +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 consiting of an internal
> +OHCI and EHCI controller.
> +
> +Required properties:
> + - compatible: "renesas,pci-r8a7790" for the R8A7790 SoC
> + - reg : A list of physical regions to access the device. The first is
> +         the operational registers for the OHCI/EHCI controller and the
> +	 second region 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 ranges. 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>;
> +	};
> +
> +Example board setup:
> +
> +&pci1 {
> +	status = "okay";
> +	pinctrl-0 = <&usb1_pins>;
> +	pinctrl-names = "default";
> +
> +	pci@0,1 {
> +		reg = <0x800 0 0 0 0>;
> +		device_type = "pci";
> +		usb-phy = <&usbphy>;
> +	};
> +
> +	pci@0,2 {
> +		reg = <0x1000 0 0 0 0>;
> +		device_type = "pci";
> +		usb-phy = <&usbphy>;
> +	};
> +};
> diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c
> index fd3e3ab..1216784 100644
> --- a/drivers/pci/host/pci-rcar-gen2.c
> +++ b/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_sys_data *sys)
>  	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 platform_device *pdev)
>  
>  	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 +396,21 @@ static int rcar_pci_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static struct of_device_id rcar_pci_of_match[] = {
> +	{ .compatible = "renesas,pci-r8a7790", },
> +	{ },
> +};
> +
> +MODULE_DEVICE_TABLE(of, rcar_pci_of_match);
> +#endif
> +
>  static struct platform_driver rcar_pci_driver = {
>  	.driver = {
>  		.name = "pci-rcar-gen2",
>  		.owner = THIS_MODULE,
>  		.suppress_bind_attrs = true,
> +		.of_match_table = of_match_ptr(rcar_pci_of_match),
>  	},
>  	.probe = rcar_pci_probe,
>  };
> -- 
> 1.9.0
>