[PATCH v4 1/2] dt-bindings: hwlock: add sun8i_hwspinlock

[Wilken Gottwalt]

Adds documentation on how to use the sun8i_hwspinlock driver for sun8i
compatible SoCs.

Signed-off-by: Wilken Gottwalt <wilken.gottwalt@xxxxxxxxxx>
---
Changes in v4:
  - changed binding to sun8i-a33-hwpinlock
  - added changes suggested by Maxime Ripard

Changes in v3:
  - changed symbols from sunxi to sun8i

Changes in v2:
  - fixed memory ranges
---
 .../bindings/hwlock/sun8i-hwspinlock.yaml     | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml

diff --git a/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml b/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml
new file mode 100644
index 000000000000..76963d8abd5f
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwlock/sun8i-hwspinlock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SUN8I hardware spinlock driver for Allwinner sun8i compatible SoCs
+
+maintainers:
+  - Wilken Gottwalt <wilken.gottwalt@xxxxxxxxxx>
+
+description:
+  The hardware unit provides sempahores between the ARM cores and the embedded
+  OpenRisc core on the SoC.
+
+properties:
+  compatible:
+    const: allwinner,sun8i-a33-hwspinlock
+
+    reg:
+      maxItems: 1
+
+    clocks:
+      maxItems: 1
+
+    clock-names:
+      items:
+        - const: ahb
+
+    resets:
+      maxItems: 1
+
+    reset-names:
+      items:
+        - const: ahb
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+
+additionalProperties: false
+
+examples:
+  - |
+    hwspinlock@1c18000 {
+      compatible = "allwinner,sun8i-a33-hwspinlock";
+      reg = <0x01c18000 0x1000>;
+      clocks = <&ccu CLK_BUS_SPINLOCK>;
+      clock-names = "ahb";
+      resets = <&ccu RST_BUS_SPINLOCK>;
+      reset-names = "ahb";
+    };
-- 
2.29.2