dt-bindings: fuse: Document R-Car E-FUSE / PFC

Document support for E-FUSE non-volatile memory accessible through PFC
on R-Car V3U and S4-8.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Yoshihiro Shimoda <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/03e43[e-mail]

Documentation/devicetree/bindings/fuse/renesas,rcar-efuse.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fuse/renesas,rcar-efuse.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: R-Car E-FUSE connected to PFC
+
+maintainers:
+  - Geert Uytterhoeven <[e-mail]>
+
+description:
+  The E-FUSE is a type of non-volatile memory, which is accessible through the
+  Pin Function Controller (PFC) on some R-Car Gen4 SoCs.
+
+properties:
+  compatible:
+    enum:
+      - renesas,r8a779a0-efuse # R-Car V3U
+      - renesas,r8a779f0-efuse # R-Car S4-8
+
+  reg:
+    maxItems: 1
+    description: PFC System Group Fuse Control and Monitor register block
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - power-domains
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a779a0-cpg-mssr.h>
+    #include <dt-bindings/power/r8a779a0-sysc.h>
+
+    fuse: fuse@e6078800 {
+            compatible = "renesas,r8a779a0-efuse";
+            reg = <0xe6078800 0x100>;
+            clocks = <&cpg CPG_MOD 916>;
+            power-domains = <&sysc R8A779A0_PD_ALWAYS_ON>;
+            resets = <&cpg 916>;
+    };