[PATCH v4 3/4] ARM: dts: add AM33XX vdd core opp50 suspend for AM335X GP EVM.

[Russ Dill]

From: Hebbar, Gururaja <gururaja.hebbar at ti.com>

This adds a sleep and wake sequence to set the VDD core voltage to the
OPP50 level, 0.950V. This saves power during suspend. The sequences are
specific to the EVM layout and PMIC, the TPS65910. The sequences
are written out by the Cortex-M3.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar at ti.com>
Signed-off-by: Russ Dill <Russ.Dill at ti.com>
---
 arch/arm/boot/dts/am335x-evm.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 3aee1a4..81ce169 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -166,6 +166,16 @@
 			status = "okay";
 			clock-frequency = <400000>;
 
+			/* Set OPP50 (0.95V) for VDD core */
+			sleep_sequence = /bits/ 8 <
+				0x02 0x2d 0x25 0x1f /* Set VDD2 to 0.95V */
+			>;
+
+			/* Set OPP100 (1.10V) for VDD core */
+			wake_sequence = /bits/ 8 <
+				0x02 0x2d 0x25 0x2b /* Set VDD2 to 1.1V */
+			>;
+
 			tps: tps at 2d {
 				reg = <0x2d>;
 			};
-- 
1.8.3.2