dt-bindings: arm: mediatek: document the pcie mirror node on MT7622

This patch adds the pcie mirror document bindings for MT7622 SoC.
The feature is used for intercepting PCIe MMIO access for the WED core
Add related info in mediatek-net bindings.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml
new file mode 100644
index 000000000000..9fbeb626ab23
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: MediaTek PCIE Mirror Controller for MT7622
+
+maintainers:
+  - Lorenzo Bianconi <lorenzo@kernel.org>
+  - Felix Fietkau <nbd@nbd.name>
+
+description:
+  The mediatek PCIE mirror provides a configuration interface for PCIE
+  controller on MT7622 soc.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - mediatek,mt7622-pcie-mirror
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+      pcie_mirror: pcie-mirror@10000400 {
+        compatible = "mediatek,mt7622-pcie-mirror", "syscon";
+        reg = <0 0x10000400 0 0x10>;
+      };
+    };