dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/timer/qcom,msm-timer.txt

@@ -0,0 +1,47 @@
+* MSM Timer
+
+Properties:
+
+- compatible : Should at least contain "qcom,msm-timer". More specific
+               properties specify which subsystem the timers are paired with.
+
+               "qcom,kpss-timer" - krait subsystem
+               "qcom,scss-timer" - scorpion subsystem
+
+- interrupts : Interrupts for the debug timer, the first general purpose
+               timer, and optionally a second general purpose timer, and
+               optionally as well, 2 watchdog interrupts, in that order.
+
+- reg : Specifies the base address of the timer registers.
+
+- clocks: Reference to the parent clocks, one per output clock. The parents
+          must appear in the same order as the clock names.
+
+- clock-names: The name of the clocks as free-form strings. They should be in
+               the same order as the clocks.
+
+- clock-frequency : The frequency of the debug timer and the general purpose
+                    timer(s) in Hz in that order.
+
+Optional:
+
+- cpu-offset : per-cpu offset used when the timer is accessed without the
+               CPU remapping facilities. The offset is
+               cpu-offset + (0x10000 * cpu-nr).
+
+Example:
+
+       timer@200a000 {
+               compatible = "qcom,scss-timer", "qcom,msm-timer";
+               interrupts = <1 1 0x301>,
+                            <1 2 0x301>,
+                            <1 3 0x301>,
+                            <1 4 0x301>,
+                            <1 5 0x301>;
+               reg = <0x0200a000 0x100>;
+               clock-frequency = <19200000>,
+                                 <32768>;
+               clocks = <&sleep_clk>;
+               clock-names = "sleep";
+               cpu-offset = <0x40000>;
+       };