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Date: Wed, 24 Apr 2024 16:23:19 -0700 (PDT)
From: matthew.gerlach@...ux.intel.com
To: Rob Herring <robh@...nel.org>
cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] dt-bindings: PCI: altera: Convert to YAML
On Mon, 22 Apr 2024, matthew.gerlach@...ux.intel.com wrote:
>
>
> On Mon, 22 Apr 2024, Rob Herring wrote:
>
>> On Sat, Apr 20, 2024 at 09:53:42AM -0500, matthew.gerlach@...ux.intel.com
>> wrote:
>>> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>>>
>>> Convert the device tree bindings for the Altera Root Port PCIe controller
>>> from text to YAML.
>>>
>>> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>>> ---
>>> v4:
>>> - reorder reg-names to match original binding
>>> - move reg and reg-names to top level with limits.
>>>
>>> v3:
>>> - Added years to copyright
>>> - Correct order in file of allOf and unevaluatedProperties
>>> - remove items: in compatible field
>>> - fix reg and reg-names constraints
>>> - replace deprecated pci-bus.yaml with pci-host-bridge.yaml
>>> - fix entries in ranges property
>>> - remove device_type from required
>>>
>>> v2:
>>> - Move allOf: to bottom of file, just like example-schema is showing
>>> - add constraint for reg and reg-names
>>> - remove unneeded device_type
>>> - drop #address-cells and #size-cells
>>> - change minItems to maxItems for interrupts:
>>> - change msi-parent to just "msi-parent: true"
>>> - cleaned up required:
>>> - make subject consistent with other commits coverting to YAML
>>> - s/overt/onvert/g
>>> ---
>>> .../devicetree/bindings/pci/altera-pcie.txt | 50 -----------
>>> .../bindings/pci/altr,pcie-root-port.yaml | 88 +++++++++++++++++++
>>> 2 files changed, 88 insertions(+), 50 deletions(-)
>>> delete mode 100644 Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> create mode 100644
>>> Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> b/Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> deleted file mode 100644
>>> index 816b244a221e..000000000000
>>> --- a/Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> +++ /dev/null
>>> @@ -1,50 +0,0 @@
>>> -* Altera PCIe controller
>>> -
>>> -Required properties:
>>> -- compatible : should contain "altr,pcie-root-port-1.0" or
>>> "altr,pcie-root-port-2.0"
>>> -- reg: a list of physical base address and length for TXS
>>> and CRA.
>>> - For "altr,pcie-root-port-2.0", additional HIP base address
>>> and length.
>>> -- reg-names: must include the following entries:
>>> - "Txs": TX slave port region
>>> - "Cra": Control register access region
>>> - "Hip": Hard IP region (if "altr,pcie-root-port-2.0")
>>> -- interrupts: specifies the interrupt source of the parent
>>> interrupt
>>> - controller. The format of the interrupt specifier depends
>>> - on the parent interrupt controller.
>>> -- device_type: must be "pci"
>>> -- #address-cells: set to <3>
>>> -- #size-cells: set to <2>
>>> -- #interrupt-cells: set to <1>
>>> -- ranges: describes the translation of addresses for root ports and
>>> - standard PCI regions.
>>> -- interrupt-map-mask and interrupt-map: standard PCI properties to
>>> define the
>>> - mapping of the PCIe interface to interrupt numbers.
>>> -
>>> -Optional properties:
>>> -- msi-parent: Link to the hardware entity that serves as the MSI
>>> controller
>>> - for this PCIe controller.
>>> -- bus-range: PCI bus numbers covered
>>> -
>>> -Example
>>> - pcie_0: pcie@...000000 {
>>> - compatible = "altr,pcie-root-port-1.0";
>>> - reg = <0xc0000000 0x20000000>,
>>> - <0xff220000 0x00004000>;
>>> - reg-names = "Txs", "Cra";
>>> - interrupt-parent = <&hps_0_arm_gic_0>;
>>> - interrupts = <0 40 4>;
>>> - interrupt-controller;
>>
>> What happened to this? It is clearly needed since the interrupt-map
>> below points back to this node. Note that that didn't work at one point
>> in time, but I think we fixed it.
>
> I think the DTs I was using test were created during the point in time when
> this did not work. The interrupt-controller boolean and #interrupt-cells
> property were in a sub node, and the interrupt-map pointed to the sub-node.
> Keeping everything in the base node maintains compatiblity. I will fix this
> for v5.
When I added the interrupt-controller boolean back to the base node,
pcie_0, and fixed the interrupt-map in the yaml example to point to
pcie_0, I get what appears to be the warning below from the
dt_binding_check below. The exit code is still 0:
make dt_binding_check DT_SCHEMA_FILES=altr,pcie-root-port.yaml
SCHEMA Documentation/devicetree/bindings/processed-schema.json
CHKDT Documentation/devicetree/bindings
LINT Documentation/devicetree/bindings
DTEX
Documentation/devicetree/bindings/pci/altr,pcie-root-port.example.dts
DTC_CHK
Documentation/devicetree/bindings/pci/altr,pcie-root-port.example.dtb
/home/mgerlach/git/linux-next/Documentation/devicetree/bindings/pci/altr,pcie-root-port.example.dtb:
pcie@...000000: interrupt-map: [[0, 0, 0, 1, 2, 1, 0, 0, 0], [2, 2, 2, 0,
0, 0, 3, 2, 3], [0, 0, 0, 4, 2, 4]] is too short
The warning from checking a DTS with the binding provides a little more
information, but the warning puzzles me because of the 9 entry lists:
make CHECK_DTBS=y DT_SCHEMA_FILES=altr,pcie-root-port.yaml
intel/socfpga_agilex7f_socdk_pcie_root_port.dtb
DTC_CHK
arch/arm64/boot/dts/intel/socfpga_agilex7f_socdk_pcie_root_port.dtb
arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi:36.4-39.46:
Warning (interrupt_map):
/soc@...ridge@...00000/pcie@...000000:interrupt-map: Cell 13 is not a
phandle(0)
/home/mgerlach/git/linux-next/arch/arm64/boot/dts/intel/socfpga_agilex7f_socdk_pcie_root_port.dtb:
pcie@...000000: interrupt-map: [[0, 0, 0, 1, 21, 1, 0, 0, 0], [2, 21, 2,
0, 0, 0, 3, 21, 3], [0, 0, 0, 4, 21, 4]] is too short
The resulting device tree and driver code work as expected, but the
warning is concerning. I can make the warning go away by putting
interrupt-controller and #interrupt-cells in a subnode and make
interrupt-map point to the subnode, but this requires changing the
accepted driver code.
Any suggestions on how to proceed? I think changing the existing driver
seems wrong.
Thanks,
Matthew Gerlach
>
>>
>> It doesn't seem you are testing the binding against an actual DT.
>> Please do that.
>
> I need to fix the DTs I'm using for test :)
>
> Thanks for the feedback,
>
> Matthew Gerlach
>
>>
>> Rob
>>
>>> - #interrupt-cells = <1>;
>>> - bus-range = <0x0 0xFF>;
>>> - device_type = "pci";
>>> - msi-parent = <&msi_to_gic_gen_0>;
>>> - #address-cells = <3>;
>>> - #size-cells = <2>;
>>> - interrupt-map-mask = <0 0 0 7>;
>>> - interrupt-map = <0 0 0 1 &pcie_0 1>,
>>> - <0 0 0 2 &pcie_0 2>,
>>> - <0 0 0 3 &pcie_0 3>,
>>> - <0 0 0 4 &pcie_0 4>;
>>> - ranges = <0x82000000 0x00000000 0x00000000 0xc0000000
>>> 0x00000000 0x10000000
>>> - 0x82000000 0x00000000 0x10000000 0xd0000000
>>> 0x00000000 0x10000000>;
>>> - };
>>
>
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