[v4,2/2] Documentation: dt: binding: rtc: add binding for ftm alarm driver

[Biwen Li <biwen.li@nxp.com>]

The patch adds binding for ftm alarm driver

Signed-off-by: Biwen Li <biwen.li@nxp.com>
---
Change in v4:
    - add note about dts and kernel options
    - add aliases in example

Change in v3:
	- remove reg-names property
	- correct cells number

Change in v2:
	- replace ls1043a with ls1088a as example
	- add rcpm node and fsl,rcpm-wakeup property

 .../bindings/rtc/rtc-fsl-ftm-alarm.txt        | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt

diff --git a/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
new file mode 100644
index 000000000000..fb018065406c
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
@@ -0,0 +1,49 @@
+Freescale FlexTimer Module (FTM) Alarm
+
+Note:
+- The driver depends on RCPM driver
+  to wake up system in sleep.
+- Need stop using RTC_HCTOSYS or use the DT aliases
+  to ensure the driver is not used as the primary RTC.
+  (Select DT aliases defaultly)
+
+Required properties:
+- compatible : Should be "fsl,<chip>-ftm-alarm", the
+	       supported chips include
+	       "fsl,ls1012a-ftm-alarm"
+	       "fsl,ls1021a-ftm-alarm"
+	       "fsl,ls1028a-ftm-alarm"
+	       "fsl,ls1043a-ftm-alarm"
+	       "fsl,ls1046a-ftm-alarm"
+	       "fsl,ls1088a-ftm-alarm"
+	       "fsl,ls208xa-ftm-alarm"
+- reg : Specifies base physical address and size of the register sets for the
+  FlexTimer Module and base physical address of IP Powerdown Exception Control
+  Register.
+- interrupts : Should be the FlexTimer Module interrupt.
+- fsl,rcpm-wakeup property and rcpm node : Please refer
+	Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+
+Optional properties:
+- big-endian: If the host controller is big-endian mode, specify this property.
+  The default endian mode is little-endian.
+
+Example:
+aliases {
+	...
+	rtc1 = ftm_alarm0; /* Use flextimer alarm driver as /dev/rtc1 */
+	...
+};
+
+rcpm: rcpm@1e34040 {
+	compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+";
+	reg = <0x0 0x1e34040 0x0 0x18>;
+	fsl,#rcpm-wakeup-cells = <6>;
+};
+
+ftm_alarm0: timer@2800000 {
+	compatible = "fsl,ls1088a-ftm-alarm";
+	reg = <0x0 0x2800000 0x0 0x10000>;
+	fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
+	interrupts = <0 44 4>;
+};
-- 
2.17.1