linux-kernel - Re: [PATCH v4 3/7] dt-bindings: pci: spacemit: introduce PCIe host controller

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Message-ID: <9e60f7ed-7afc-4151-a301-4a0832b9105f@riscstar.com>
Date: Thu, 30 Oct 2025 20:37:16 -0500
From: Alex Elder <elder@...cstar.com>
To: Rob Herring <robh@...nel.org>
Cc: krzk+dt@...nel.org, conor+dt@...nel.org, bhelgaas@...gle.com,
 lpieralisi@...nel.org, kwilczynski@...nel.org, mani@...nel.org,
 dlan@...too.org, guodong@...cstar.com, devicetree@...r.kernel.org,
 linux-pci@...r.kernel.org, spacemit@...ts.linux.dev,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] dt-bindings: pci: spacemit: introduce PCIe host
 controller

On 10/30/25 7:58 PM, Rob Herring wrote:
> On Thu, Oct 30, 2025 at 05:02:54PM -0500, Alex Elder wrote:
>> Add the Device Tree binding for the PCIe root complex found on the
>> SpacemiT K1 SoC.  This device is derived from the Synopsys Designware
>> PCIe IP.  It supports up to three PCIe ports operating at PCIe gen 2
>> link speeds (5 GT/sec).  One of the ports uses a combo PHY, which is
>> typically used to support a USB 3 port.
>>
>> Signed-off-by: Alex Elder <elder@...cstar.com>
>> ---
>>   .../bindings/pci/spacemit,k1-pcie-host.yaml   | 157 ++++++++++++++++++
>>   1 file changed, 157 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pci/spacemit,k1-pcie-host.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/pci/spacemit,k1-pcie-host.yaml b/Documentation/devicetree/bindings/pci/spacemit,k1-pcie-host.yaml
>> new file mode 100644
>> index 0000000000000..58239a155ecc0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pci/spacemit,k1-pcie-host.yaml
>> @@ -0,0 +1,157 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/pci/spacemit,k1-pcie-host.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: SpacemiT K1 PCI Express Host Controller
>> +
>> +maintainers:
>> +  - Alex Elder <elder@...cstar.com>
>> +
>> +description: >
>> +  The SpacemiT K1 SoC PCIe host controller is based on the Synopsys
>> +  DesignWare PCIe IP.  The controller uses the DesignWare built-in
>> +  MSI interrupt controller, and supports 256 MSIs.
> 
> Wrap lines at 80.

OK.

>> +
>> +allOf:
>> +  - $ref: /schemas/pci/snps,dw-pcie.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: spacemit,k1-pcie
>> +
>> +  reg:
>> +    items:
>> +      - description: DesignWare PCIe registers
>> +      - description: ATU address space
>> +      - description: PCIe configuration space
>> +      - description: Link control registers
>> +
>> +  reg-names:
>> +    items:
>> +      - const: dbi
>> +      - const: atu
>> +      - const: config
>> +      - const: link
>> +
>> +  clocks:
>> +    items:
>> +      - description: DWC PCIe Data Bus Interface (DBI) clock
>> +      - description: DWC PCIe application AXI-bus master interface clock
>> +      - description: DWC PCIe application AXI-bus slave interface clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: dbi
>> +      - const: mstr
>> +      - const: slv
>> +
>> +  resets:
>> +    items:
>> +      - description: DWC PCIe Data Bus Interface (DBI) reset
>> +      - description: DWC PCIe application AXI-bus master interface reset
>> +      - description: DWC PCIe application AXI-bus slave interface reset
>> +
>> +  reset-names:
>> +    items:
>> +      - const: dbi
>> +      - const: mstr
>> +      - const: slv
>> +
>> +  interrupts:
>> +    items:
>> +      - description: Interrupt used for MSIs
>> +
>> +  interrupt-names:
>> +    const: msi
>> +
>> +  spacemit,apmu:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    description:
>> +      A phandle that refers to the APMU system controller, whose
>> +      regmap is used in managing resets and link state, along with
>> +      and offset of its reset control register.
>> +    items:
>> +      - items:
>> +          - description: phandle to APMU system controller
>> +          - description: register offset
>> +
>> +patternProperties:
>> +  '^pcie?@':
> 
> It's always PCIe, so drop the '?'.

I'll fix that.

> With that,
> 
> Reviewed-by: Rob Herring (Arm) <robh@...nel.org>

Thanks for the review.

					-Alex