[PATCH 07/12] dt-bindings: net: Add StarFive JH7100 SoC

[Cristian Ciocaltea]

Add DT bindings documentation for the Synopsys DesignWare MAC found on
the StarFive JH7100 SoC.

Adjust 'reset' and 'reset-names' properties to allow using 'ahb' instead
of the 'stmmaceth' reset signal, as required by JH7100.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
 .../devicetree/bindings/net/snps,dwmac.yaml   |  15 ++-
 .../bindings/net/starfive,jh7100-dwmac.yaml   | 106 ++++++++++++++++++
 MAINTAINERS                                   |   5 +
 3 files changed, 122 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml

diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
index e88a86623fce..71522a2cd7a4 100644
--- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
@@ -89,6 +89,7 @@ properties:
         - snps,dwmac-5.10a
         - snps,dwxgmac
         - snps,dwxgmac-2.10
+        - starfive,jh7100-dwmac
 
   reg:
     minItems: 1
@@ -131,12 +132,17 @@ properties:
         - ptp_ref
 
   resets:
-    maxItems: 1
-    description:
-      MAC Reset signal.
+    minItems: 1
+    items:
+      - description: MAC Reset signal
+      - description: AHB Reset signal
 
   reset-names:
-    const: stmmaceth
+    minItems: 1
+    contains:
+      enum:
+        - stmmaceth
+        - ahb
 
   power-domains:
     maxItems: 1
@@ -578,6 +584,7 @@ allOf:
               - snps,dwxgmac
               - snps,dwxgmac-2.10
               - st,spear600-gmac
+              - starfive,jh7100-dwmac
 
     then:
       properties:
diff --git a/Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml b/Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml
new file mode 100644
index 000000000000..6afe30690172
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022 StarFive Technology Co., Ltd.
+# Copyright (C) 2022 Emil Renner Berthing <kernel at esmil.dk>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/starfive,jh7100-dwmac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7100 DWMAC Ethernet Controller
+
+maintainers:
+  - Emil Renner Berthing <kernel at esmil.dk>
+
+# We need a select here so we don't match all nodes with 'snps,dwmac'
+select:
+  properties:
+    compatible:
+      contains:
+        const: starfive,jh7100-dwmac
+  required:
+    - compatible
+
+allOf:
+  - $ref: snps,dwmac.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: starfive,jh7100-dwmac
+      - const: snps,dwmac
+
+  clocks:
+    items:
+      - description: GMAC main clock
+      - description: GMAC AHB clock
+      - description: PTP clock
+      - description: GTX clock
+      - description: TX clock
+
+  clock-names:
+    items:
+      - const: stmmaceth
+      - const: pclk
+      - const: ptp_ref
+      - const: gtxc
+      - const: tx
+
+  resets:
+    description: AHB Reset signal
+
+  reset-names:
+    const: ahb
+
+  starfive,syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to the syscon node
+
+  starfive,gtxclk-dlychain:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: GTX clock delay chain setting
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/starfive-jh7100.h>
+    #include <dt-bindings/reset/starfive-jh7100.h>
+
+    gmac: ethernet at 10020000 {
+      compatible = "starfive,jh7100-dwmac", "snps,dwmac";
+      reg = <0x0 0x10020000 0x0 0x10000>;
+      clocks = <&clkgen JH7100_CLK_GMAC_ROOT_DIV>,
+               <&clkgen JH7100_CLK_GMAC_AHB>,
+               <&clkgen JH7100_CLK_GMAC_PTP_REF>,
+               <&clkgen JH7100_CLK_GMAC_GTX>,
+               <&clkgen JH7100_CLK_GMAC_TX_INV>;
+      clock-names = "stmmaceth", "pclk", "ptp_ref", "gtxc", "tx";
+      resets = <&rstgen JH7100_RSTN_GMAC_AHB>;
+      reset-names = "ahb";
+      interrupts = <6>, <7>;
+      interrupt-names = "macirq", "eth_wake_irq";
+      max-frame-size = <9000>;
+      phy-mode = "rgmii-txid";
+      snps,multicast-filter-bins = <32>;
+      snps,perfect-filter-entries = <128>;
+      starfive,syscon = <&sysmain>;
+      rx-fifo-depth = <32768>;
+      tx-fifo-depth = <16384>;
+      snps,axi-config = <&stmmac_axi_setup>;
+      snps,fixed-burst;
+      snps,force_thresh_dma_mode;
+      snps,no-pbl-x8;
+
+      stmmac_axi_setup: stmmac-axi-config {
+        snps,wr_osr_lmt = <0xf>;
+        snps,rd_osr_lmt = <0xf>;
+        snps,blen = <256 128 64 32 0 0 0>;
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index abed40db41f0..d48468b81b94 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19816,6 +19816,11 @@ M:	Emil Renner Berthing <kernel at esmil.dk>
 S:	Maintained
 F:	arch/riscv/boot/dts/starfive/
 
+STARFIVE DWMAC GLUE LAYER
+M:	Emil Renner Berthing <kernel at esmil.dk>
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml
+
 STARFIVE JH7100 CLOCK DRIVERS
 M:	Emil Renner Berthing <kernel at esmil.dk>
 S:	Maintained
-- 
2.39.1