[PATCH net-next v2 4/5] dt-bindings: net: Add UltraRISC DP1000 GMAC

[Jia Wang]

The DP1000 integrates a Synopsys DesignWare GMAC from the 5.20 series with
one MMIO register range, one clock and one interrupt.

It also provides fixed TX and RX RGMII clock delays that cannot be
disabled. Board connections must therefore not add either delay in PCB
traces, making "rgmii-id" the only supported phy-mode.

Signed-off-by: Jia Wang <wangjia at ultrarisc.com>
Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
---
 .../devicetree/bindings/net/snps,dwmac.yaml        |  1 +
 .../bindings/net/ultrarisc,dp1000-gmac.yaml        | 74 ++++++++++++++++++++++
 MAINTAINERS                                        |  5 ++
 3 files changed, 80 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
index 2449311c6d28..2ed4564ae99d 100644
--- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
@@ -119,6 +119,7 @@ properties:
         - starfive,jh7110-dwmac
         - tesla,fsd-ethqos
         - thead,th1520-gmac
+        - ultrarisc,dp1000-gmac
 
   reg:
     minItems: 1
diff --git a/Documentation/devicetree/bindings/net/ultrarisc,dp1000-gmac.yaml b/Documentation/devicetree/bindings/net/ultrarisc,dp1000-gmac.yaml
new file mode 100644
index 000000000000..13029302877b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/ultrarisc,dp1000-gmac.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/ultrarisc,dp1000-gmac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: UltraRISC DP1000 DWMAC Ethernet controller
+
+maintainers:
+  - Jia Wang <wangjia at ultrarisc.com>
+
+description:
+  The DP1000 integrates a Synopsys DesignWare GMAC controller from the
+  5.20 series. The SoC integration adds fixed RGMII TX and RX clock delays
+  which cannot be disabled. Consequently, a functional RGMII link requires
+  a PCB without TX or RX clock delays, represented by "rgmii-id".
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: ultrarisc,dp1000-gmac
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: ultrarisc,dp1000-gmac
+      - const: snps,dwmac-5.20
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: stmmaceth
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    const: macirq
+
+  phy-mode:
+    const: rgmii-id
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - interrupt-names
+  - phy-mode
+
+allOf:
+  - $ref: snps,dwmac.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    ethernet at 38000000 {
+        compatible = "ultrarisc,dp1000-gmac", "snps,dwmac-5.20";
+        reg = <0x38000000 0x1000000>;
+        clocks = <&clk 0>;
+        clock-names = "stmmaceth";
+        interrupts = <84>;
+        interrupt-names = "macirq";
+        phy-mode = "rgmii-id";
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 6215fcb07770..01597d1df270 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -27995,6 +27995,11 @@ F:	Documentation/devicetree/bindings/clock/ultrarisc,dp1000-clk.yaml
 F:	drivers/clk/ultrarisc/*
 F:	include/dt-bindings/clock/ultrarisc,dp1000-clk.h
 
+ULTRARISC DP1000 DWMAC GLUE LAYER
+M:	Jia Wang <wangjia at ultrarisc.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/ultrarisc,dp1000-gmac.yaml
+
 ULTRARISC DP1000 PINCTRL DRIVER
 M:	Jia Wang <wangjia at ultrarisc.com>
 L:	linux-gpio at vger.kernel.org

-- 
2.34.1