[PATCH v5 06/12] dt-bindings: serial: add Ambarella CV75 UART

[Long Zhao via B4 Relay <devnull+longzhao.ambarella.com@kernel.org>]

From: Long Zhao <longzhao@ambarella.com>

Document the Ambarella CV75 on-chip UART controller binding for early
console bring-up. The binding requires a single RCT clock input and
fixed 32-bit register access via reg-shift and reg-io-width.

Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
 .../bindings/serial/ambarella,cv75-uart.yaml       | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml b/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml
new file mode 100644
index 000000000000..223c84bf460d
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/ambarella,cv75-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ambarella CV75 UART
+
+maintainers:
+  - Long Zhao <longzhao@ambarella.com>
+
+allOf:
+  - $ref: serial.yaml#
+
+properties:
+  compatible:
+    const: ambarella,cv75-uart
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  reg-shift:
+    const: 2
+
+  reg-io-width:
+    const: 4
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - reg-shift
+  - reg-io-width
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/ambarella,cv75-rct.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    serial@e4000000 {
+        compatible = "ambarella,cv75-uart";
+        reg = <0xe4000000 0x1000>;
+        clocks = <&rct CV75_GCLK_UART0>;
+        interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>;
+        reg-shift = <2>;
+        reg-io-width = <4>;
+    };

-- 
2.34.1