dt-bindings: crypto: Add documentation for sl3516-ce

This patch adds documentation for Device-Tree bindings for the
SL3516-ce cryptographic offloader driver.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
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/cortina,sl3516-crypto.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/crypto/cortina,sl3516-crypto.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SL3516 cryptographic offloader driver
+
+maintainers:
+  - Corentin Labbe <clabbe@baylibre.com>
+
+properties:
+  compatible:
+    enum:
+      - cortina,sl3516-crypto
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/cortina,gemini-clock.h>
+    #include <dt-bindings/reset/cortina,gemini-reset.h>
+
+    crypto@62000000 {
+        compatible = "cortina,sl3516-crypto";
+        reg = <0x62000000 0x10000>;
+        interrupts = <7 IRQ_TYPE_EDGE_RISING>;
+        resets = <&syscon GEMINI_RESET_SECURITY>;
+        clocks = <&syscon GEMINI_CLK_GATE_SECURITY>;
+    };