dt-bindings: Add documentation for the BCM63138 timer and syscon-reboot

A timer node and a syscon-reboot node are required for software reboot
to work on BCM63138, document these two nodes in the platform binding.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm63138.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm63138.txt
index 999e074..b82b6a0 100644 (file)
--- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm63138.txt
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm63138.txt
@@ -49,3 +49,37 @@ Example:
                compatible = "brcm,bcm63138-bootlut";
                reg = <0x8000 0x50>;
        };
+
+=======
+reboot
+------
+Two nodes are required for software reboot: a timer node and a syscon-reboot node.
+
+Timer node:
+
+- compatible: Must be "brcm,bcm6328-timer", "syscon"
+- reg: Register base address and length
+
+Syscon reboot node:
+
+See Documentation/devicetree/bindings/power/reset/syscon-reboot.txt for the
+detailed list of properties, the two values defined below are specific to the
+BCM6328-style timer:
+
+- offset: Should be 0x34 to denote the offset of the TIMER_WD_TIMER_RESET register
+  from the beginning of the TIMER block
+- mask: Should be 1 for the SoftRst bit.
+
+Example:
+
+       timer: timer@80 {
+               compatible = "brcm,bcm6328-timer", "syscon";
+               reg = <0x80 0x3c>;
+       };
+
+       reboot {
+               compatible = "syscon-reboot";
+               regmap = <&timer>;
+               offset = <0x34>;
+               mask = <0x1>;
+       };