dt-bindings: CAN: Add StarFive CAN module

Add documentation to describe StarFive CAN engine.

Signed-off-by: William Qiu <william.qiu@starfivetech.com>

Documentation/devicetree/bindings/net/can/ipms-can.yaml

@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+#$id: http://devicetree.org/schemas/net/can/ipms-can.yaml#
+#$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: IPMS CAN/CANFD controller Device Tree Bindings
+
+properties:
+  compatible:
+    const:ipms,can
+
+  reg:
+    maxItems: 1
+    items:
+      - description:CAN controller registers
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description:apb_clk clock
+      - description:core_clk clock
+      - description:timer_clk clock
+
+  clock-names:
+    minItems: 1
+    items:
+      - const:apb_clk
+      - const:core_clk
+      - const:timer_clk
+  resets:
+   minItems: 1
+    items:
+      - description:apb_clk reset
+      - description:core_clk reset
+      - description:timer_clk reset
+  reset-names:
+    minItems: 1
+    items:
+      - const:rst_apb
+      - const:rst_core
+      - const:rst_timer
+  starfive,sys-syscon:
+    format:
+    starfive,sys-syscon = <&arg0 arg1 arg2 arg3>
+    description:
+      arg0:arg0 is sys_syscon.
+      arg1:arg1 is syscon register offset, used to enable can2.0/canfd function, can0 is 0x10, can1 is 0x88.
+      arg2:arg2 is used to enable the register shift of the can2.0/canfd function, can0 is 0x3, can1 is 0x12.
+      arg3:arg3 is used to enable the register mask of the can2.0/canfd function, can0 is 0x8, can1 is 0x40000
+
+  syscon,can_or_canfd:
+    description:
+    IPMS CAN-CTRL core is a serial communications controller that performs serial communication according to the CAN protocol.
+    This CAN bus interface uses the basic CAN principle and meets all constraints of the CAN-specification 2.0B active.
+    Furthermore this CAN core can be configured to meet the specification of CAN with flexible data rate CAN FD.
+    When syscon,can_or_canfd is set to 0, use CAN2.0B.
+    when syscon,can_or_canfd is set to 1, use CAN FD.
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - starfive,sys-syscon
+  - syscon,can_or_canfd
+additionalProperties:false
+
+examples:
+  - |
+    can0: can@130d0000{
+    compatible = "ipms,can";
+    reg = <0x0 0x130d0000 0x0 0x1000>;
+    interrupts = <112>;
+    interrupt-parent = <&plic>;
+    clocks = <&clkgen JH7110_CAN0_CTRL_CLK_APB>,
+             <&clkgen JH7110_CAN0_CTRL_CLK_CAN>,
+             <&clkgen JH7110_CAN0_CTRL_CLK_TIMER>;
+    clock-names = "apb_clk",
+                  "core_clk",
+                  "timer_clk";
+    resets = <&rstgen RSTN_U0_CAN_CTRL_APB>,
+             <&rstgen RSTN_U0_CAN_CTRL_CORE>,
+             <&rstgen RSTN_U0_CAN_CTRL_TIMER>;
+    reset-names = "rst_apb",
+                  "rst_core",
+                  "rst_timer";
+    starfive,sys-syscon = <&sys_syscon, 0x10 0x3 0x8>;
+    syscon,can_or_canfd = <0>;
+    };
+
+...