[PATCH 1/2] dt-bindings: hwlock: sunxi: add sunxi_hwspinlock documentation

[Wilken Gottwalt <wilken.gottwalt@posteo.net>]

Adds documentation on how to use/enable the sunxi_hwspinlock driver.

Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net>
---
 .../bindings/hwlock/sunxi-hwspinlock.yaml     | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwlock/sunxi-hwspinlock.yaml

diff --git a/Documentation/devicetree/bindings/hwlock/sunxi-hwspinlock.yaml b/Documentation/devicetree/bindings/hwlock/sunxi-hwspinlock.yaml
new file mode 100644
index 000000000000..773eaa6b33ca
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/sunxi-hwspinlock.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwlock/sunxi-hwspinlock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SUNXI hardware spinlock for Allwinner based SoCs
+
+maintainers:
+  - Wilken Gottwalt <wilken.gottwalt@posteo.net>
+
+properties:
+  compatible:
+    enum:
+      - allwinner,sun8i-hwspinlock
+      - allwinner,sun50i-hwspinlock
+
+    reg:          # 0x01C18000 (H2+, H3, H5), 0x03004000 (H6), length 0x400 (max 256 * 32bit)
+      maxItems: 1
+
+    clocks:       # phandle to the reference clock
+      maxItems: 1
+
+    clock-names:  # name of the bus ("ahb")
+      maxItems: 1
+
+    resets:       # phandle to the reset control
+      maxItems: 1
+
+    reset-names:  # name of the bus ("ahb")
+      maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+
+additionalProperties: false
+
+examples:
+
+  - |
+    /* H2+ based OrangePi Zero */
+    hwspinlock: hwspinlock@1C18000 {
+      compatible = "allwinner,sun8i-hwspinlock";
+      reg = <0x01c18000 0x400>;
+      clocks = <&ccu CLK_BUS_SPINLOCK>;
+      clock-names = "ahb";
+      resets = <&ccu RST_BUS_SPINLOCK>;
+      reset-names = "ahb";
+    };
+
+    /* H6 based OrangePi 3 */
+    hwspinlock: hwspinlock@3004000 {
+      compatible = "allwinner,sun50i-hwspinlock";
+      reg = <0x03004000 0x400>;
+      clocks = <&ccu CLK_BUS_SPINLOCK>;
+      clock-names = "ahb";
+      resets = <&ccu RST_BUS_SPINLOCK>;
+      reset-names = "ahb";
+    };
-- 
2.29.2