[PATCH v5 5/9] dt-bindings: pci: rcar pcie device tree bindings

[PATCH v5 5/9] dt-bindings: pci: rcar pcie device tree bindings

[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-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
---
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 | 44 ++++++++++++++++++++++
 1 file changed, 44 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..61bf5ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
@@ -0,0 +1,44 @@
+* Renesas RCar PCIe interface
+
+Required properties:
+- compatible: should contain one of the following
+	"renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791"
+- reg: base addresses and lengths of the pcie controller.
+- #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: handle to pci clock.
+- 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>;
+		#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";
+	};
-- 
1.9.0

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Re: [PATCH v5 5/9] dt-bindings: pci: rcar pcie device tree bindings

[Sergei Shtylyov]

Hello.

On 03/25/2014 07:56 PM, Phil Edworthy wrote:

> 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>
> ---
> 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 | 44 ++++++++++++++++++++++
>   1 file changed, 44 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..61bf5ef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
> @@ -0,0 +1,44 @@
> +* Renesas RCar PCIe interface
> +
> +Required properties:
> +- compatible: should contain one of the following
> +	"renesas,pcie-r8a7779", "renesas,pcie-r8a7790", "renesas,pcie-r8a7791"
> +- reg: base addresses and lengths of the pcie controller.

    Hmm, need "registers" at end. And why plural?

> +- #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: handle to pci clock.

    s/handle/phandle/, s/pci/PCI/.
    Actually, it's a clock specifier consisting not only of phandle but also 
of clock #. Looking at your example, it's even a pair of clock specifiers.

> +- 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>;

    Hmm, this prop looks board-dependent...

> +		interrupts = <0 116 4 0 117 4 0 118 4>;
> +		#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";
> +	};

WBR, Sergei

Re: [PATCH v5 5/9] dt-bindings: pci: rcar pcie device tree bindings

[Phil.Edworthy]

Hi Sergei,

On: 25/03/2014 19:22, Sergei wrote:
> Subject: Re: [PATCH v5 5/9] dt-bindings: pci: rcar pcie device tree 
bindings
> 
> Hello.
> 
> On 03/25/2014 07:56 PM, Phil Edworthy wrote:
> 
> > 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>
> > ---
> > 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 | 44 
++++++++++++++++++++++
> >   1 file changed, 44 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..61bf5ef
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt
> > @@ -0,0 +1,44 @@
> > +* Renesas RCar PCIe interface
> > +
> > +Required properties:
> > +- compatible: should contain one of the following
> > +   "renesas,pcie-r8a7779", "renesas,pcie-r8a7790", 
"renesas,pcie-r8a7791"
> > +- reg: base addresses and lengths of the pcie controller.
> 
>     Hmm, need "registers" at end. And why plural?
Ok, & yes it should be singular.


> > +- #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: handle to pci clock.
> 
>     s/handle/phandle/, s/pci/PCI/.
>     Actually, it's a clock specifier consisting not only of phandle but 
also 
> of clock #. Looking at your example, it's even a pair of clock 
specifiers.
Right, and yes it's two clocks - I missed that when adding the PCI bus 
clock.

 
> > +- 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>;
> 
>     Hmm, this prop looks board-dependent...
Initially I thought that it would be board dependent and map the actual 
DDR available. However, I then considered that it is probably ok to map 
all possible DDR ranges that the device is capable of using. I'm ok with 
either approach though...


> > +      interrupts = <0 116 4 0 117 4 0 118 4>;
> > +      #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";
> > +   };
> 
> WBR, Sergei
> 

Thanks
Phil