[PATCH v5 1/2] dt-bindings: PCI: qcom,sa8255p-pcie-ep: Document firmware managed PCIe endpoint
From: Mrinmay Sarkar <hidden>
Date: 2026-01-06 12:35:11
Also in:
linux-arm-msm, linux-pci, lkml
Subsystem:
arm/qualcomm mailing list, open firmware and flattened device tree bindings, pci native host bridge and endpoint drivers, pci subsystem, pcie endpoint driver for qualcomm, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
Document the required configuration to enable the PCIe Endpoint controller on SA8255p which is managed by firmware using power-domain based handling. Signed-off-by: Mrinmay Sarkar <redacted> Reviewed-by: Krzysztof Kozlowski <redacted> --- .../bindings/pci/qcom,sa8255p-pcie-ep.yaml | 110 +++++++++++++++++++++ 1 file changed, 110 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/qcom,sa8255p-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,sa8255p-pcie-ep.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..e338797d5dc2f68e2ad658e7f2c073023c4aea75
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/qcom,sa8255p-pcie-ep.yaml@@ -0,0 +1,110 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pci/qcom,sa8255p-pcie-ep.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Qualcomm firmware managed PCIe Endpoint Controller + +description: + Qualcomm SA8255p SoC PCIe endpoint controller is based on the Synopsys + DesignWare PCIe IP which is managed by firmware. + +maintainers: + - Manivannan Sadhasivam <mani@kernel.org> + +properties: + compatible: + const: qcom,sa8255p-pcie-ep + + reg: + items: + - description: Qualcomm-specific PARF configuration registers + - description: DesignWare PCIe registers + - description: External local bus interface registers + - description: Address Translation Unit (ATU) registers + - description: Memory region used to map remote RC address space + - description: BAR memory region + - description: DMA register space + + reg-names: + items: + - const: parf + - const: dbi + - const: elbi + - const: atu + - const: addr_space + - const: mmio + - const: dma + + interrupts: + items: + - description: PCIe Global interrupt + - description: PCIe Doorbell interrupt + - description: DMA interrupt + + interrupt-names: + items: + - const: global + - const: doorbell + - const: dma + + iommus: + maxItems: 1 + + reset-gpios: + description: GPIO used as PERST# input signal + maxItems: 1 + + wake-gpios: + description: GPIO used as WAKE# output signal + maxItems: 1 + + power-domains: + maxItems: 1 + + dma-coherent: true + + num-lanes: + default: 2 + +required: + - compatible + - reg + - reg-names + - interrupts + - interrupt-names + - reset-gpios + - power-domains + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + #include <dt-bindings/interrupt-controller/arm-gic.h> + soc { + #address-cells = <2>; + #size-cells = <2>; + pcie1_ep: pcie-ep@1c10000 { + compatible = "qcom,sa8255p-pcie-ep"; + reg = <0x0 0x01c10000 0x0 0x3000>, + <0x0 0x60000000 0x0 0xf20>, + <0x0 0x60000f20 0x0 0xa8>, + <0x0 0x60001000 0x0 0x4000>, + <0x0 0x60200000 0x0 0x100000>, + <0x0 0x01c13000 0x0 0x1000>, + <0x0 0x60005000 0x0 0x2000>; + reg-names = "parf", "dbi", "elbi", "atu", "addr_space", "mmio", "dma"; + interrupts = <GIC_SPI 518 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 474 IRQ_TYPE_LEVEL_HIGH>; + interrupt-names = "global", "doorbell", "dma"; + reset-gpios = <&tlmm 4 GPIO_ACTIVE_LOW>; + wake-gpios = <&tlmm 5 GPIO_ACTIVE_LOW>; + dma-coherent; + iommus = <&pcie_smmu 0x80 0x7f>; + power-domains = <&scmi6_pd 1>; + num-lanes = <4>; + }; + };
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2.25.1