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-rw-r--r--Documentation/devicetree/bindings/arm/shmobile.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/shmobile.txt b/Documentation/devicetree/bindings/arm/shmobile.txt
index 5d8229d74a5f..253bf9b86690 100644
--- a/Documentation/devicetree/bindings/arm/shmobile.txt
+++ b/Documentation/devicetree/bindings/arm/shmobile.txt
@@ -85,3 +85,21 @@ Boards:
compatible = "renesas,sk-rzg1m", "renesas,r8a7743"
- Wheat
compatible = "renesas,wheat", "renesas,r8a7792"
+
+
+Most Renesas ARM SoCs have a Product Register that allows to retrieve SoC
+product and revision information. If present, a device node for this register
+should be added.
+
+Required properties:
+ - compatible: Must be "renesas,prr".
+ - reg: Base address and length of the register block.
+
+
+Examples
+--------
+
+ prr: chipid@ff000044 {
+ compatible = "renesas,prr";
+ reg = <0 0xff000044 0 4>;
+ };