dt-bindings: PCI: dwc: rockchip: Add RK3528 variant

RK3528 ships a PCIe Gen2x1 controller that operates in RC mode only.
Since the SoC has no separate MSI controller, the one integrated in the
DWC PCIe IP must be used, and thus its interrupt scheme is similar to
variants found in RK3562 and RK3576.

Older BSP code claimed its integrated MSI controller supports only 8
MSIs[1], but this has been changed in newer BSP[2] and testing proves
the controller works correctly with more than 8 MSIs allocated,
suggesting the controller should be compatible with the RK3568 variant.
Hence, document its compatible string.

Signed-off-by: Yao Zi <ziyao@disroot.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://github.com/rockchip-linux/kernel/blob/792a7d4273a5/drivers/pci/controller/dwc/pcie-dw-rockchip.c#L1610-L1613
Link: https://github.com/rockchip-linux/kernel/blob/1ba51b059f25/drivers/pci/controller/dwc/pcie-dw-rockchip.c#L904-L906
Link: https://patch.msgid.link/20250918153057.56023-2-ziyao@disroot.org

diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
index 6c6d828ce964133655552fedbdd8869c536c161f..67f1a55020482a635eb246da2895b1d68ca5314c 100644 (file)
--- a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -22,6 +22,7 @@ properties:
       - const: rockchip,rk3568-pcie
       - items:
           - enum:
+              - rockchip,rk3528-pcie
               - rockchip,rk3562-pcie
               - rockchip,rk3576-pcie
               - rockchip,rk3588-pcie
@@ -78,6 +79,7 @@ allOf:
           compatible:
             contains:
               enum:
+                - rockchip,rk3528-pcie
                 - rockchip,rk3562-pcie
                 - rockchip,rk3576-pcie
     then:
@@ -89,6 +91,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - rockchip,rk3528-pcie
               - rockchip,rk3562-pcie
               - rockchip,rk3576-pcie
     then: