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authorMugunthan V N <mugunthanvnm@ti.com>2016-01-16 21:33:58 +0530
committerSimon Glass <sjg@chromium.org>2016-01-20 19:06:21 -0700
commitc8336975381d481829e3e6a81c38cd118826ca03 (patch)
treefae575cc1e4752a6a2272fd3607c1d124e1a1e5d /doc
parent28a6c01187d30f0e7b7dbe6e4e198e76ce6246f1 (diff)
dm: timer: uclass: add timer init in uclass driver to add timer device
Adding timer init function in timer-uclass driver to create and initialize the timer device on platforms where u-boot,dm-pre-reloc is not used. Since there will be multiple timer devices in the system, adding a tick-timer node in chosen node to know which timer device to be used as tick timer in u-boot. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Diffstat (limited to 'doc')
-rw-r--r--doc/device-tree-bindings/chosen.txt43
1 files changed, 43 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt
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+The chosen node
+---------------
+The chosen node does not represent a real device, but serves as a place
+for passing data like which serial device to used to print the logs etc
+
+
+stdout-path property
+--------------------
+Device trees may specify the device to be used for boot console output
+with a stdout-path property under /chosen.
+
+Example
+-------
+/ {
+ chosen {
+ stdout-path = "/serial@f00:115200";
+ };
+
+ serial@f00 {
+ compatible = "vendor,some-uart";
+ reg = <0xf00 0x10>;
+ };
+};
+
+tick-timer property
+-------------------
+In a system there are multiple timers, specify which timer to be used
+as the tick-timer. Earlier it was hardcoded in the timer driver now
+since device tree has all the timer nodes. Specify which timer to be
+used as tick timer.
+
+Example
+-------
+/ {
+ chosen {
+ tick-timer = "/timer2@f00";
+ };
+
+ timer2@f00 {
+ compatible = "vendor,some-timer";
+ reg = <0xf00 0x10>;
+ };
+};