Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / rtc / dw-apb.txt

diff --git a/kernel/Documentation/devicetree/bindings/rtc/dw-apb.txt b/kernel/Documentation/devicetree/bindings/rtc/dw-apb.txt
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+++ b/kernel/Documentation/devicetree/bindings/rtc/dw-apb.txt
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+* Designware APB timer
+
+Required properties:
+- compatible: One of:
+       "snps,dw-apb-timer"
+       "snps,dw-apb-timer-sp" <DEPRECATED>
+       "snps,dw-apb-timer-osc" <DEPRECATED>
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- interrupts: IRQ line for the timer.
+- either clocks+clock-names or clock-frequency properties
+
+Optional properties:
+- clocks       : list of clock specifiers, corresponding to entries in
+                 the clock-names property;
+- clock-names  : should contain "timer" and "pclk" entries, matching entries
+                 in the clocks property.
+- clock-frequency: The frequency in HZ of the timer.
+- clock-freq: For backwards compatibility with picoxcell
+
+If using the clock specifiers, the pclk clock is optional, as not all
+systems may use one.
+
+
+Example:
+       timer@ffe00000 {
+               compatible = "snps,dw-apb-timer";
+               interrupts = <0 170 4>;
+               reg = <0xffe00000 0x1000>;
+               clocks = <&timer_clk>, <&timer_pclk>;
+               clock-names = "timer", "pclk";
+       };