On 05/05/16 14:15, Arnd Bergmann wrote: > On Thursday 05 May 2016 12:14:59 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" > > When I suggested splitting out the MSI support, I was thinking (but not writing) > that you'd use an msi-parent property to refer to the node that holds the > msi-controller as well. Humm fair enough. > >> +- 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). > > So this supports 64-bit non-prefetchable windows? Usually 64-bit windows > are prefetchable. > >> +- 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) > > I'm still not too happy with this property. I see no reason for the log2 > format (rather than length in bytes, or offset/length tuples, or dma-ranges, > or phandles pointing to the memory controllers). I think we need to discuss > this some more. Sure, works for me. > >> +- 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. > > to repeat my earlier comment from v1: > > Shouldn't the link generation be probed automatically? It is, but if the property is present, we can foce the link negotiation, We have had cases where this was desired and helpful. > >> +- <*>-supply: see Documentation/devicetree/bindings/regulator/regulator.txt >> + >> +- <*>-supply-names: see Documentation/devicetree/bindings/regulator/regulator.txt > > I don't see supply-names documented there. Meh, I read that wrong, will fix that. Thanks! -- Florian -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
