Date:   Wed, 27 Mar 2019 16:23:19 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Jon Hunter <jonathanh@...dia.com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <thierry.reding@...il.com>, <kishon@...com>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <lorenzo.pieralisi@....com>, <jingoohan1@...il.com>,
        <gustavo.pimentel@...opsys.com>, <mperttunen@...dia.com>,
        <tiwai@...e.de>, <spujar@...dia.com>, <skomatineni@...dia.com>,
        <liviu.dudau@....com>, <krzk@...nel.org>, <heiko@...ech.de>,
        <horms+renesas@...ge.net.au>, <olof@...om.net>,
        <maxime.ripard@...tlin.com>, <andy.gross@...aro.org>,
        <bjorn.andersson@...aro.org>, <jagan@...rulasolutions.com>,
        <enric.balletbo@...labora.com>, <ezequiel@...labora.com>,
        <stefan.wahren@...e.com>, <marc.w.gonzalez@...e.fr>,
        <l.stach@...gutronix.de>, <tpiepho@...inj.com>,
        <hayashi.kunihiko@...ionext.com>, <yue.wang@...ogic.com>,
        <shawn.lin@...k-chips.com>, <xiaowei.bao@....com>
CC:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>
Subject: Re: [PATCH 05/10] dt-bindings: PCI: tegra: Add device tree support
 for T194

On 3/27/2019 3:40 PM, Jon Hunter wrote:
> 
> 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@...dia.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?
Thanks for catching this.
Yes. PCIe uses power-domains and I'll add that in the future patch.

> 
> Cheers
> Jon
> 

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