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@xxxxxxxxxxx>
> > ---
> > 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
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