[RFC PATCH v1 08/14] dt-bindings: power: thead,th1520: Add support for power domains

[Michal Wilczynski]

Add power domain support to the Thead TH1520 clock controller bindings.
This enables devices to specify their power domain dependencies,
improving power management for components like the GPU.

Signed-off-by: Michal Wilczynski <m.wilczynski@xxxxxxxxxxx>
---
 .../bindings/power/thead,th1520-power.yaml    | 52 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/thead,th1520-power.yaml

diff --git a/Documentation/devicetree/bindings/power/thead,th1520-power.yaml b/Documentation/devicetree/bindings/power/thead,th1520-power.yaml
new file mode 100644
index 000000000000..528af54f4ca6
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/thead,th1520-power.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/thead,th1520-power.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: T-HEAD TH1520 Power Domain Controller
+
+maintainers:
+  - Michal Wilczynski <m.wilczynski@xxxxxxxxxxx>
+
+description: |
+  The T-HEAD TH1520 SoC includes a power domain controller responsible for
+  managing the power states of various hardware domains such as the GPU.
+
+  This binding describes the power domain controller node, which can be used by
+  devices to manage their power domains.
+
+properties:
+  compatible:
+    const: "thead,th1520-pd"
+
+  thead,vosys-regmap:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: |
+      Phandle to a syscon node representing the shared register space of the VO (Video Output) subsystem.
+      This register space includes both clock control registers and other control registers used for
+      operations like resetting the GPU. Since these registers reside in the same address space,
+      access to them is coordinated through a shared syscon regmap provided by the specified syscon node.
+
+  '#power-domain-cells':
+    const: 1
+
+required:
+  - compatible
+  - thead,vosys-regmap
+  - '#power-domain-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    vosys_regmap: vosys@ffef528000 {
+        compatible = "syscon";
+        reg = <0xff 0xef528000 0x0 0x1000>;
+    };
+
+    power-controller {
+        compatible = "thead,th1520-pd";
+        thead,vosys-regmap = <&vosys_regmap>;
+        #power-domain-cells = <1>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 16fb58aa74b1..acbe311087ad 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20187,6 +20187,7 @@ F:	Documentation/devicetree/bindings/clock/thead,th1520-clk.yaml
 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/power/thead,th1520-power.yaml
 F:	arch/riscv/boot/dts/thead/
 F:	drivers/clk/thead/
 F:	drivers/mailbox/mailbox-th1520.c
-- 
2.34.1