Re: [PATCH 05/10] dt-bindings: PCI: tegra: Add device tree support for T194

Jon Hunter
2019-03-27T10:10:22Z

On 26/03/2019 15:13, Vidya Sagar wrote:
> Add support for Tegra194 PCIe controllers. These controllers are based
> on Synopsys DesignWare core IP.
>
> Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
> ---
> .../bindings/pci/nvidia,tegra194-pcie.txt | 209 +++++++++++++++++++++
> .../devicetree/bindings/phy/phy-tegra194-p2u.txt | 34 ++++
> 2 files changed, 243 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
> create mode 100644 Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt
>
> diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
> new file mode 100644
> index 000000000000..31527283a0cd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
> @@ -0,0 +1,209 @@
> +NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based)
> +
> +This PCIe host controller is based on the Synopsis Designware PCIe IP
> +and thus inherits all the common properties defined in designware-pcie.txt.
> +
> +Required properties:
> +- compatible: For Tegra19x, must contain "nvidia,tegra194-pcie".
> +- device_type: Must be "pci"
> +- reg: A list of physical base address and length for each set of controller
> + registers. Must contain an entry for each entry in the reg-names property.
> +- reg-names: Must include the following entries:
> + "appl": Controller's application logic registers
> + "window1": This is the aperture of controller available under 4GB boundary
> + (i.e. within 32-bit space). This aperture is typically used for
> + accessing config space of root port itself and also the connected
> + endpoints (by appropriately programming internal Address
> + Translation Unit's (iATU) out bound region) and also to map
> + prefetchable/non-prefetchable BARs.
> + "config": As per the definition in designware-pcie.txt
> + "atu_dma": iATU and DMA register. This is where the iATU (internal Address
> + Translation Unit) registers of the PCIe core are made available
> + fow SW access.
> + "dbi": The aperture where root port's own configuration registers are
> + available
> + "window2": This is the larger (compared to window1) aperture available above
> + 4GB boundary (i.e. in 64-bit space). This is typically used for
> + mapping prefetchable/non-prefetchable BARs of endpoints
> +- interrupts: A list of interrupt outputs of the controller. Must contain an
> + entry for each entry in the interrupt-names property.
> +- interrupt-names: Must include the following entries:
> + "intr": The Tegra interrupt that is asserted for controller interrupts
> + "msi": The Tegra interrupt that is asserted when an MSI is received
> +- bus-range: Range of bus numbers associated with this controller
> +- #address-cells: Address representation for root ports (must be 3)
> + - cell 0 specifies the bus and device numbers of the root port:
> + [23:16]: bus number
> + [15:11]: device number
> + - cell 1 denotes the upper 32 address bits and should be 0
> + - cell 2 contains the lower 32 address bits and is used to translate to the
> + CPU address space
> +- #size-cells: Size representation for root ports (must be 2)
> +- ranges: Describes the translation of addresses for root ports and standard
> + PCI regions. The entries must be 7 cells each, where the first three cells
> + correspond to the address as described for the #address-cells property
> + above, the fourth and fifth cells are for the physical CPU address to
> + translate to and the sixth and seventh cells are as described for the
> + #size-cells property above.
> + - Entries setup the mapping for the standard I/O, memory and
> + prefetchable PCI regions. The first cell determines the type of region
> + that is setup:
> + - 0x81000000: I/O memory region
> + - 0x82000000: non-prefetchable memory region
> + - 0xc2000000: prefetchable memory region
> + Please refer to the standard PCI bus binding document for a more detailed
> + explanation.
> +- #interrupt-cells: Size representation for interrupts (must be 1)
> +- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
> + Please refer to the standard PCI bus binding document for a more detailed
> + explanation.
> +- clocks: Must contain an entry for each entry in clock-names.
> + See ../clocks/clock-bindings.txt for details.
> +- clock-names: Must include the following entries:
> + - core_clk
> +- resets: Must contain an entry for each entry in reset-names.
> + See ../reset/reset.txt for details.
> +- reset-names: Must include the following entries:
> + - core_apb_rst
> + - core_rst
> +- phys: Must contain a phandle to P2U PHY for each entry in phy-names.
> +- phy-names: Must include an entry for each active lane.
> + "pcie-p2u-N": where N ranges from 0 to one less than the total number of lanes
> +- Controller dependent register offsets
> + - nvidia,event-cntr-ctrl: EVENT_COUNTER_CONTROL reg offset
> + 0x168 - FPGA
> + 0x1a8 - C1, C2 and C3
> + 0x1c4 - C4
> + 0x1d8 - C0 and C5
> + - nvidia,event-cntr-data: EVENT_COUNTER_DATA reg offset
> + 0x16c - FPGA
> + 0x1ac - C1, C2 and C3
> + 0x1c8 - C4
> + 0x1dc - C0 and C5
> +- nvidia,controller-id : Controller specific ID
> + 0x0 - C0
> + 0x1 - C1
> + 0x2 - C2
> + 0x3 - C3
> + 0x4 - C4
> + 0x5 - C5
> +- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals

I don't see any power-domains listed here. We should have these for T194
right?

Cheers
Jon

--
nvpublic