[PATCH net-next 03/12] dt-bindings: net: pcs: add bindings for Renesas RZ/N1 MII converter

["Clément Léger" <clement.leger@bootlin.com>]

This MII converter can be found on the RZ/N1 processor family. The MII
converter ports are declared as subnodes which are then referenced by
users of the PCS driver such as the switch.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
---
 .../bindings/net/pcs/renesas,rzn1-miic.yaml   | 95 +++++++++++++++++++
 include/dt-bindings/net/pcs-rzn1-miic.h       | 19 ++++
 2 files changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
 create mode 100644 include/dt-bindings/net/pcs-rzn1-miic.h

diff --git a/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml b/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
new file mode 100644
index 000000000000..ccb25ce6cbde
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pcs/renesas,rzn1-miic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/N1 MII converter
+
+maintainers:
+  - Clément Léger <clement.leger@bootlin.com>
+
+description: |
+  This MII converter is present on the Renesas RZ/N1 SoC family. It is
+  responsible to do MII passthrough or convert it to RMII/RGMII.
+
+properties:
+  compatible:
+      const: renesas,rzn1-miic
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  clocks:
+    items:
+      - description: MII reference clock
+      - description: RGMII reference clock
+      - description: RMII reference clock
+      - description: AHB clock used for the MII converter register interface
+
+  renesas,miic-cfg-mode:
+    description: MII mux configuration mode. This value should use one of the
+                 value defined in dt-bindings/net/pcs-rzn1-miic.h.
+    $ref: /schemas/types.yaml#/definitions/uint32
+  
+patternProperties:
+  "^mii-conv@[0-4]$":
+    type: object
+    description: MII converter port
+
+    properties:
+      reg:
+        maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - renesas,miic-cfg-mode
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/net/pcs-rzn1-miic.h>
+    #include <dt-bindings/clock/r9a06g032-sysctrl.h>
+
+    eth-miic@44030000 {
+      compatible = "renesas,rzn1-miic";
+      #address-cells = <1>;
+      #size-cells = <0>;
+      reg = <0x44030000 0x10000>;
+      clocks = <&sysctrl R9A06G032_CLK_MII_REF>,
+              <&sysctrl R9A06G032_CLK_RGMII_REF>,
+              <&sysctrl R9A06G032_CLK_RMII_REF>,
+              <&sysctrl R9A06G032_HCLK_SWITCH_RG>;
+      renesas,miic-cfg-mode = <MIIC_MUX_MAC2_MAC1_SWD_SWC_SWB_SWA>;
+
+      mii_conv0: mii-conv@0 {
+        reg = <0>;
+      };
+
+      mii_conv1: mii-conv@1 {
+        reg = <1>;
+      };
+
+      mii_conv2: mii-conv@2 {
+        reg = <2>;
+      };
+
+      mii_conv3: mii-conv@3 {
+        reg = <3>;
+      };
+
+      mii_conv4: mii-conv@4 {
+        reg = <4>;
+      };
+    };
\ No newline at end of file
diff --git a/include/dt-bindings/net/pcs-rzn1-miic.h b/include/dt-bindings/net/pcs-rzn1-miic.h
new file mode 100644
index 000000000000..c5a0f382967b
--- /dev/null
+++ b/include/dt-bindings/net/pcs-rzn1-miic.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 Schneider-Electric
+ *
+ * Clément Léger <clement.leger@bootlin.com>
+ */
+
+#ifndef _DT_BINDINGS_PCS_RZN1_MIIC
+#define _DT_BINDINGS_PCS_RZN1_MIIC
+
+/*
+ * Reefer to the datasheet [1] section 8.2.1, Internal Connection of Ethernet
+ * Ports to check the meaning of these values.
+ *
+ * [1] REN_r01uh0750ej0140-rzn1-introduction_MAT_20210228.pdf
+ */
+#define MIIC_MUX_MAC2_MAC1_SWD_SWC_SWB_SWA	0x13
+
+#endif
-- 
2.34.1