dt-bindings: reset: Document canaan,k210-rst bindings

Document the device tree bindings for the Canaan Kendryte K210 SoC
reset controller driver in
Documentation/devicetree/bindings/reset/canaan,k210-rst.yaml. The header
file include/dt-bindings/reset/k210-rst.h is added to define all
possible reset lines of the SoC.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/reset/canaan,k210-rst.yaml b/Documentation/devicetree/bindings/reset/canaan,k210-rst.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/canaan,k210-rst.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Canaan Kendryte K210 Reset Controller Device Tree Bindings
+
+maintainers:
+  - Damien Le Moal <damien.lemoal@wdc.com>
+
+description: |
+  Canaan Kendryte K210 reset controller driver which supports the SoC
+  system controller supplied reset registers for the various peripherals
+  of the SoC. The K210 reset controller node must be defined as a child
+  node of the K210 system controller node.
+
+  See also:
+  - dt-bindings/reset/k210-rst.h
+
+properties:
+  compatible:
+    const: canaan,k210-rst
+
+  '#reset-cells':
+    const: 1
+
+required:
+  - '#reset-cells'
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/reset/k210-rst.h>
+    sysrst: reset-controller {
+      compatible = "canaan,k210-rst";
+      #reset-cells = <1>;
+    };