ARM: u300: device tree support for the timer

This adds device tree support for the U300 timer, by making
the memory base offset and IRQ dynamically assigned, then
optionally looking them up from the device tree.

Since the timer needs to be registered before any platform
devices are created, we will go into the device tree and look
up the "/timer@c0014000" node and read our base address and
IRQ from there.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt b/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt
new file mode 100644
index 00000000000..9499bc8ee9e
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt
@@ -0,0 +1,18 @@
+ST-Ericsson U300 apptimer
+
+Required properties:
+
+- compatible : should be "stericsson,u300-apptimer"
+- reg : Specifies base physical address and size of the registers.
+- interrupts : A list of 4 interrupts; one for each subtimer. These
+  are, in order: OS (operating system), DD (device driver) both
+  adopted for EPOC/Symbian with two specific IRQs for these tasks,
+  then GP1 and GP2, which are general-purpose timers.
+
+Example:
+
+timer {
+	compatible = "stericsson,u300-apptimer";
+	reg = <0xc0014000 0x1000>;
+	interrupts = <24 25 26 27>;
+};