[PATCH v2 2/2] dt-bindings: Add GPIO locked fixed clock

[Vyacheslav Yurkov via B4 Relay]

From: Vyacheslav Yurkov <V.Yurkov.EXT@xxxxxxxxxx>

Describe device tree binding for a fixed clock, which state can only be
determined by the external GPIO. It's similar to gated-fixed-clock, but
the GPIO direction is inverted.

Signed-off-by: Vyacheslav Yurkov <uvv.mail@xxxxxxxxx>
Signed-off-by: Vyacheslav Yurkov <V.Yurkov.EXT@xxxxxxxxxx>
---
 .../bindings/clock/gpio-locked-fixed-clock.yaml    | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/gpio-locked-fixed-clock.yaml b/Documentation/devicetree/bindings/clock/gpio-locked-fixed-clock.yaml
new file mode 100644
index 000000000000..e0256bbd441d
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/gpio-locked-fixed-clock.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/gpio-locked-fixed-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO Locked Fixed Clock
+
+maintainers:
+  - Vyacheslav Yurkov <V.Yurkov.EXT@xxxxxxxxxx>
+
+description: |
+  Clock controller that aggregates input clocks and/or GPIO
+  signals and exposes them as a single clock output.
+
+properties:
+  compatible:
+    const: gpio-locked-fixed-clock
+
+  "#clock-cells":
+    const: 0
+
+  clocks:
+    description: Input clocks that externally locked.
+
+  clock-names:
+    description: Input clock names.
+
+  clock-output-names:
+    description: Names of the clock provided by this controller.
+    maxItems: 1
+
+  locked-gpios:
+    description: |
+      GPIOs to check the lock state.
+    minItems: 1
+    maxItems: 32
+
+  gpio-names:
+    description: Names corresponding to each GPIO.
+    minItems: 1
+    maxItems: 32
+
+required:
+  - compatible
+  - "#clock-cells"
+anyOf:
+  - required:
+      - clocks
+  - required:
+      - locked-gpios
+dependentRequired:
+  gpio-names:
+    - locked-gpios
+  clock-names:
+    - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    clk_gpio_locked: gpio-locked-fixed-clock {
+        compatible = "gpio-locked-fixed-clock";
+        #clock-cells = <0>;
+
+        clocks = <&clk0 0>, <&pll 0>;
+
+        locked-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>,
+                <&gpio0 5 GPIO_ACTIVE_HIGH>,
+                <&gpio1 2 GPIO_ACTIVE_LOW>;
+
+        gpio-names = "gpio0", "gpio1", "gpio2";
+
+        clock-output-names = "clkout0";
+    };

-- 
2.34.1