Document the bindings for STM32MP25 PCIe Controller configured in root complex mode. Supports 4 legacy interrupts and MSI interrupts from the ARM GICv2m controller. Allow tuning to change payload (default 128B) thanks to the st,max-payload-size entry. Can also limit the Maximum Read Request Size on downstream devices to the minimum possible value between 128B and 256B. STM32 PCIE may be in a power domain which is the case for the STM32MP25 based boards. Supports wake# from wake-gpios Signed-off-by: Christian Bruel <christian.bruel@xxxxxxxxxxx> --- .../bindings/pci/st,stm32-pcie-host.yaml | 149 ++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/st,stm32-pcie-host.yaml diff --git a/Documentation/devicetree/bindings/pci/st,stm32-pcie-host.yaml b/Documentation/devicetree/bindings/pci/st,stm32-pcie-host.yaml new file mode 100644 index 000000000000..d7d360b63a08 --- /dev/null +++ b/Documentation/devicetree/bindings/pci/st,stm32-pcie-host.yaml @@ -0,0 +1,149 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pci/st,stm32-pcie-host.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STM32MP25 PCIe root complex driver + +maintainers: + - Christian Bruel <christian.bruel@xxxxxxxxxxx> + +description: + PCIe root complex controller based on the Synopsys DesignWare PCIe core. + +select: + properties: + compatible: + const: st,stm32mp25-pcie-rc + required: + - compatible + +allOf: + - $ref: /schemas/pci/pci-host-bridge.yaml# + - $ref: /schemas/pci/snps,dw-pcie-common.yaml# + +properties: + compatible: + const: st,stm32mp25-pcie-rc + + reg: + items: + - description: Data Bus Interface (DBI) registers. + - description: PCIe configuration registers. + + reg-names: + items: + - const: dbi + - const: config + + resets: + maxItems: 1 + + reset-names: + const: core + + clocks: + maxItems: 1 + description: PCIe system clock + + clock-names: + const: core + + phys: + maxItems: 1 + + phy-names: + const: pcie-phy + + num-lanes: + const: 1 + + msi-parent: + maxItems: 1 + + reset-gpios: + description: GPIO controlled connection to PERST# signal + maxItems: 1 + + wake-gpios: + description: GPIO controlled connection to WAKE# input signal + maxItems: 1 + + st,limit-mrrs: + description: If present limit downstream MRRS to 256B + type: boolean + + st,max-payload-size: + description: Maximum Payload size to use + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [128, 256] + default: 128 + + wakeup-source: true + + power-domains: + maxItems: 1 + + access-controllers: + maxItems: 1 + +if: + required: + - wakeup-source +then: + required: + - wake-gpios + +required: + - interrupt-map + - interrupt-map-mask + - ranges + - resets + - reset-names + - clocks + - clock-names + - phys + - phy-names + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/clock/st,stm32mp25-rcc.h> + #include <dt-bindings/gpio/gpio.h> + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/phy/phy.h> + #include <dt-bindings/reset/st,stm32mp25-rcc.h> + + pcie@48400000 { + compatible = "st,stm32mp25-pcie-rc"; + device_type = "pci"; + num-lanes = <1>; + reg = <0x48400000 0x400000>, + <0x10000000 0x10000>; + reg-names = "dbi", "config"; + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 7>; + interrupt-map = <0 0 0 1 &intc 0 0 GIC_SPI 264 IRQ_TYPE_LEVEL_HIGH>, + <0 0 0 2 &intc 0 0 GIC_SPI 265 IRQ_TYPE_LEVEL_HIGH>, + <0 0 0 3 &intc 0 0 GIC_SPI 266 IRQ_TYPE_LEVEL_HIGH>, + <0 0 0 4 &intc 0 0 GIC_SPI 267 IRQ_TYPE_LEVEL_HIGH>; + #address-cells = <3>; + #size-cells = <2>; + ranges = <0x01000000 0 0x10010000 0x10010000 0 0x10000>, + <0x02000000 0 0x10020000 0x10020000 0 0x7fe0000>, + <0x42000000 0 0x18000000 0x18000000 0 0x8000000>; + bus-range = <0x00 0xff>; + clocks = <&rcc CK_BUS_PCIE>; + clock-names = "core"; + phys = <&combophy PHY_TYPE_PCIE>; + phy-names = "pcie-phy"; + resets = <&rcc PCIE_R>; + reset-names = "core"; + msi-parent = <&v2m0>; + wakeup-source; + wake-gpios = <&gpioh 5 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; + access-controllers = <&rifsc 76>; + power-domains = <&CLUSTER_PD>; + }; -- 2.34.1
