dt-bindings: crypto: Add DT bindings documentation for amlogic-crypto

This patch adds documentation for Device-Tree bindings for the
Amlogic GXL cryptographic offloader driver.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/crypto/amlogic,gxl-crypto.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/crypto/amlogic,gxl-crypto.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic GXL Cryptographic Offloader
+
+maintainers:
+  - Corentin Labbe <clabbe@baylibre.com>
+
+properties:
+  compatible:
+    items:
+    - const: amlogic,gxl-crypto
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: "Interrupt for flow 0"
+      - description: "Interrupt for flow 1"
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: blkmv
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/gxbb-clkc.h>
+
+    crypto: crypto-engine@c883e000 {
+        compatible = "amlogic,gxl-crypto";
+        reg = <0x0 0xc883e000 0x0 0x36>;
+        interrupts = <GIC_SPI 188 IRQ_TYPE_EDGE_RISING>, <GIC_SPI 189 IRQ_TYPE_EDGE_RISING>;
+        clocks = <&clkc CLKID_BLKMV>;
+        clock-names = "blkmv";
+    };