Re: [PATCH v2 1/2] Documentation: DT: bindings: Add Broadcom STB PCIe bindings

[Rob Herring]

On Thu, May 05, 2016 at 12:14:59PM -0700, Florian Fainelli wrote:
> From: Jim Quinlan <jim2101024@xxxxxxxxx>
> 
> This patchs adds the Device Tree bindings for the Broadcom STB PCIe root
> complex hardware.
> 
> Signed-off-by: Jim Quinlan <jim2101024@xxxxxxxxx>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
> Changes in v2:
> 
> - rewrite the binding document almost from scratch to include many more
>   references to existing documents
> - describe missing properties
> - give better examples
> 
>  .../devicetree/bindings/pci/brcm,brcmstb-pcie.txt  | 98 ++++++++++++++++++++++
>  1 file changed, 98 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/brcm,brcmstb-pcie.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/brcm,brcmstb-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,brcmstb-pcie.txt
> new file mode 100644
> index 000000000000..3682b0f0bc26
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,brcmstb-pcie.txt
> @@ -0,0 +1,98 @@
> +Broadcom STB PCIe Host Controller Device Tree Bindings
> +
> +This document describes the binding of the PCIe Root Complex hardware found in
> +Broadcom Set Top Box System-on-Chips such as BCM7425 (MIPS), BCM7435 (MIPS) and
> +BCM7445 (ARMv7).
> +
> +Required properties:
> +- compatible: must be one of: "brcm,bcm7425-pcie"
> +			      "brcm,bcm7435-pcie"
> +			      "brcm,bcm7445-pcie"
> +
> +- reg: specifies the physical base address of the controller registers and
> +  its length
> +
> +- interrupt-parent: must be a reference (phandle) to the parent interrupt
> +  controller in the system (7038-l1-intc on MIPS, GIC on ARM/ARM64)
> +
> +- interrrupts: first interrupt must be the Level 1 interrupt number corresponding
> +  to the main PCIe RC interrupt, second interrupt must be the MSI interrupt
> +  See the interrupt-parent documentation for the number of cells and their meaning:
> +  MIPS: Documentation/devicetree/bindings/interrupt-controller/brcm,bcm7038-l1-intc.txt
> +  ARM/ARM64: Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
> +
> +- interrupt-names: must be "pcie", and if present "msi"
> +
> +- interrupt-map: see pci.txt
> +
> +- interrupt-map-mask: see pci.txt
> +
> +- #address-cells: must be set to <3>, see pci.txt
> +
> +- #size-cells: must be set to <2>, see pci.txt
> +
> +- ranges: ranges for the PCI outbound windows, no I/O or prefetchable windows
> +  must be specified here, only non-prefetchable. 32-bits windows or 64-bits
> +  windows are allowed based on the host processor's capabilities (ARM w/ LPAE,
> +  ARM64).
> +
> +- #interrupt-cells: set to <1>, see pci.txt
> +
> +- brcm,log2-scb-sizes: log2 size of the SCB window that is mapped to PCIe space
> +  there must be exactly one value per memory controller present in the system
> +  (ranges from 1 to 3)
> +
> +Optional properties:
> +
> +- msi-controller: indicates that this is a MSI controller node (when supported)
> +
> +- clocks: phandle to the functional clock that feeds into the PCIe RC block
> +
> +- clock-names: the name(s) of the clocks specified in 'clocks'.  Note
> +  that if the 'clocks' property is given, 'clock-names' is mandatory,
> +  and the name of the clock is expected to be "pcie".
> +
> +- brcm,ssc: boolean that indicates usage of spread-spectrum clocking

Shouldn't this be a property of the phy? Is there no separate phy to 
control?

> +
> +- brcm,gen: integer that indicates desired forced generation of link: 1 => 2.5
> +  Gbps, 2 => 5.0 Gbps, 3 => 8.0 Gbps. Will override the auto-negotation if
> +  specified.
> +
> +- <*>-supply: see Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +- <*>-supply-names: see Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +Example Node:
> +
> +This example assumes that the top-level #address-cells = <2> and #size-cells =
> +<2>, e.g: ARM LPAE configuration.
> +
> +	pcie0: pcie-controller@f0460000 {
> +		reg = <0x0 0xf0460000 0x0 0x9310>;
> +		interrupts = <0x0 0x33 0x4>, <0x0 0x34, 0x4>;
                                                      ^
typo

> +		interrupt-names = "pcie", "msi";
> +		compatible = "brcm,bcm7445-pcie";
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +
> +		/* Two non-prefetchable 32-bits memory space, each of 128MB
> + 		 * with the following mapping:
> +		 * PCIe address		=> CPU physical address space
> +		 * 0x00_0000_0000	=> 0x00_C000_0000
> +		 * 0x00_0800_0000	=> 0x00_C800_0000
> +		 */
> +		ranges = <0x02000000 0x00000000 0x00000000 0x00000000 0xc0000000 0x00000000 0x08000000>,
> +			 <0x02000000 0x00000000 0x08000000 0x00000000 0xc8000000 0x00000000 0x08000000>;
> +		#interrupt-cells = <1>;
> +		interrupt-map-mask = <0xf800 0 0 7>;
> +		interrupt-map = <0 0 0 1 &intc 47 3
> +				 0 0 0 2 &intc 48 3
> +				 0 0 0 3 &intc 49 3
> +				 0 0 0 4 &intc 50 3>;
> +		clocks = <&pcie0>;
> +		clock-names = "pcie";
> +		brcm,ssc;
> +		brcm,log2-scb-sizes = <0x1e 0x1e 0x1e>;
> +		vreg-wifi-pwr-supply-names = "vreg-wifi-pwr";
> +		vreg-wifi-pwr-supply = <&vreg-wifi-pwr>;

The supply for the PCIE RC is called "vreg-wifi-pwr"? Seems a bit 
strange.

Rob