linux-kernel - Re: [PATCH v3 3/7] dt-bindings: pci: spacemit: introduce PCIe host controller

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Message-ID: <20251020210001.GA1764520-robh@kernel.org>
Date: Mon, 20 Oct 2025 16:00:01 -0500
From: Rob Herring <robh@...nel.org>
To: Alex Elder <elder@...cstar.com>
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 v3 3/7] dt-bindings: pci: spacemit: introduce PCIe host
 controller

On Fri, Oct 17, 2025 at 02:07:35PM -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>
> ---
> v3: - Remove the "num-viewport" property
>     - A "phy" reset is no longer required
> 
>  .../bindings/pci/spacemit,k1-pcie-host.yaml   | 147 ++++++++++++++++++
>  1 file changed, 147 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..89f8b6b579c6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/spacemit,k1-pcie-host.yaml
> @@ -0,0 +1,147 @@
> +# 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.
> +
> +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
> +
> +  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
> +
> +  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
> +
> +  phys:
> +    maxItems: 1
> +

> +  vpcie3v3-supply:
> +    description:
> +      A phandle for 3.3v regulator to use for PCIe
> +
> +  device_type:
> +    const: pci

Both of these are part of pci-bus-common.yaml and can be dropped from 
here.

> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - spacemit,apmu

> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges

Always required by pci-bus-common.yaml. Drop.

> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +  - interrupts
> +  - interrupt-names
> +  - phys
> +  - vpcie3v3-supply

> +  - device_type

Always required by pci-bus-common.yaml. Drop.

With that,

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