[PATCH v2] ARM: dts: witherspoon: add Epson RX8900CE RTC module

[Chris Smart]

This commit adds the relevant device tree entry for the Epson RX8900CE
RTC module on the I2C bus.

Note that there are two options that we may need to set.

If there is no connected battery:
 epson,vdet-disable;

If there is no trickle charge diode:
 epson,vdet-disable;

These are currently left commented out in the commit.

Signed-off-by: Chris Smart <chris at distroguy.com>
---

Changes since v1:
	- fixed up the entry for rtc at 32

 arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
index 328a9c4e189e..19a91a207530 100644
--- a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
@@ -148,7 +148,19 @@
 
 	/* TPM */
 	/* 9552 */
+
 	/* RTC */
+	rtc at 32 {
+		compatible = "epson,rx8900"
+		reg = <0x32>;
+		/*
+		 * If no battery, set this:
+		 * epson,vdet-disable;
+		 * If no trickle charge diode, set this:
+		 * epson,vdet-disable;
+		 */
+	};
+
 	/* EEPROM */
 
 	eeprom at 51 {
-- 
2.9.3