Bindings: nvmem: add bindings for JZ4780 efuse

This patch brings support for the JZ4780 efuse. Currently it only exposes
a read only access to the entire 8K bits efuse memory.
Tested-by: NMathieu Malaterre <malat@debian.org>
Signed-off-by: NPrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Signed-off-by: NMathieu Malaterre <malat@debian.org>
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
[converted to yaml]
Signed-off-by: NAndreas Kemnade <andreas@kemnade.info>
Reviewed-by: NPaul Cercueil <paul@crapouillou.net>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200310132257.23358-12-srinivas.kandagatla@linaro.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/ingenic,jz4780-efuse.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ingenic JZ EFUSE driver bindings
+
+maintainers:
+  - PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - ingenic,jz4780-efuse
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    # Handle for the ahb for the efuse.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/jz4780-cgu.h>
+
+    efuse@134100d0 {
+        compatible = "ingenic,jz4780-efuse";
+        reg = <0x134100d0 0x2c>;
+
+        clocks = <&cgu JZ4780_CLK_AHB2>;
+    };
+
+...