dt-bindings: reset: Add T-HEAD TH1520 SoC Reset Controller

Add a YAML schema for the T-HEAD TH1520 SoC reset controller. This
controller manages resets for subsystems such as the GPU within the
TH1520 SoC.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Michal Wilczynski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Philipp Zabel <[e-mail]>

Documentation/devicetree/bindings/reset/thead,th1520-reset.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/thead,th1520-reset.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: T-HEAD TH1520 SoC Reset Controller
+
+description:
+  The T-HEAD TH1520 reset controller is a hardware block that asserts/deasserts
+  resets for SoC subsystems.
+
+maintainers:
+  - Michal Wilczynski <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - thead,th1520-reset
+
+  reg:
+    maxItems: 1
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+      rst: reset-controller@ffef528000 {
+        compatible = "thead,th1520-reset";
+        reg = <0xff 0xef528000 0x0 0x1000>;
+        #reset-cells = <1>;
+      };
+    };

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml
 F:	Documentation/devicetree/bindings/net/thead,th1520-gmac.yaml
 F:	Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml
+F:	Documentation/devicetree/bindings/reset/thead,th1520-reset.yaml
 F:	arch/riscv/boot/dts/thead/
 F:	drivers/clk/thead/clk-th1520-ap.c
 F:	drivers/firmware/thead,th1520-aon.c
···
 F:	drivers/pmdomain/thead/
 F:	include/dt-bindings/clock/thead,th1520-clk-ap.h
 F:	include/dt-bindings/power/thead,th1520-power.h
+F:	include/dt-bindings/reset/thead,th1520-reset.h
 F:	include/linux/firmware/thead/thead,th1520-aon.h
 
 RNBD BLOCK DRIVERS

include/dt-bindings/reset/thead,th1520-reset.h

···
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (c) 2024 Samsung Electronics Co., Ltd.
+ * Author: Michal Wilczynski <[e-mail]>
+ */
+
+#ifndef _DT_BINDINGS_TH1520_RESET_H
+#define _DT_BINDINGS_TH1520_RESET_H
+
+#define TH1520_RESET_ID_GPU		0
+#define TH1520_RESET_ID_GPU_CLKGEN	1
+#define TH1520_RESET_ID_NPU		2
+#define TH1520_RESET_ID_WDT0		3
+#define TH1520_RESET_ID_WDT1		4
+
+#endif /* _DT_BINDINGS_TH1520_RESET_H */