[v7,05/10] dt-bindings: pci: rcar pcie device tree bindings

This patch adds the bindings for the R-Car PCIe driver. The driver
resides under drivers/pci/host/pcie-rcar.c

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>

v7:
 - Change binding description of clocks to 'clock specifiers'

v6:
 - Correct DT bindings description for reg and clocks

v5:
 - Add PCIe bus clock reference
 - Add additional interrupt bindings
 - Use dma-ranges property to specify inbound memory regions
---
 Documentation/devicetree/bindings/pci/rcar-pci.txt | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/rcar-pci.txt

Am Montag, den 31.03.2014, 11:30 +0100 schrieb Phil Edworthy:
> This patch adds the bindings for the R-Car PCIe driver. The driver
> resides under drivers/pci/host/pcie-rcar.c
> 
> Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>

Another nitpick below, otherwise:
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>

If you decide to roll another version with just this changed, feel free
to carry over the my tag.
> 
> v7:
>  - Change binding description of clocks to 'clock specifiers'
> 
> v6:
>  - Correct DT bindings description for reg and clocks
> 
> v5:
>  - Add PCIe bus clock reference
>  - Add additional interrupt bindings
>  - Use dma-ranges property to specify inbound memory regions
> ---
>  Documentation/devicetree/bindings/pci/rcar-pci.txt | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/rcar-pci.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt
> new file mode 100644
> index 0000000..789bd46
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
> @@ -0,0 +1,45 @@
> +* Renesas RCar PCIe interface
> +
> +Required properties:
> +- compatible: should contain one of the following
> +	"renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791"
> +- reg: base address and length of the pcie controller registers.
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions.
> +- dma-ranges: ranges for the inbound memory regions.
> +- interrupts: two interrupt sources for MSI interrupts, followed by interrupt
> +	source for hardware related interrupts (e.g. link speed change).
> +- #interrupt-cells: set to <1>
> +- interrupt-map-mask and interrupt-map: standard PCI properties
> +	to define the mapping of the PCIe interface to interrupt
> +	numbers.
> +- clocks: from common clock binding: clock specifiers for the PCIe controller
> +	and PCIe bus clocks.
> +- clock-names: from common clock binding: should be "pcie" and "pcie_bus".
> +
> +Example:
> +
> +SoC specific DT Entry:
> +
> +	pcie: pcie@fe000000 {
> +		compatible = "renesas,pcie-r8a7791";
> +		reg = <0 0xfe000000 0 0x80000>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x01000000 0 0x00000000 0 0xfe100000 0 0x00100000
> +			  0x02000000 0 0xfe200000 0 0xfe200000 0 0x00200000
> +			  0x02000000 0 0x30000000 0 0x30000000 0 0x08000000
> +			  0x42000000 0 0x38000000 0 0x38000000 0 0x08000000>;
> +		dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000
> +			      0x42000000 2 0x00000000 2 0x00000000 0 0x40000000>;
> +		interrupts = <0 116 4 0 117 4 0 118 4>;

I think this is confusing, I would rather like to see them in separate
cells, like
	interrupts = <0 116 4>, <0 117 4>, <0 118 4>;

Same would be true for the ranges properties, but there it isn't as
confusing, so I don't really care.

> +		#interrupt-cells = <1>;
> +		interrupt-map-mask = <0 0 0 0>;
> +		interrupt-map = <0 0 0 0 &gic 0 116 4>;
> +		clocks = <&mstp3_clks R8A7791_CLK_PCIE>, <&pcie_bus_clk>;
> +		clock-names = "pcie", "pcie_bus";
> +		status = "disabled";
> +	};