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authorchenhui zhao <chenhui.zhao@freescale.com>2015-05-15 14:42:30 +0800
committerYork Sun <yorksun@freescale.com>2015-08-03 12:06:36 -0700
commit933db81c0494f692bbd384db11f7bab43706c87c (patch)
tree85f174b25cf1a9a52ed7d45632849b4946b8b3ae /board
parent99e1bd4241262440dce8950ccadb9d8588b0479b (diff)
armv7/ls1021atwr: program the regulator for deep sleep
Program the external regulator to switch off voltage in deep sleep. Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com> Acked-by: Alison Wang <alison.wang@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'board')
-rw-r--r--board/freescale/ls1021atwr/ls1021atwr.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c
index d62323e3ed6..698f755033a 100644
--- a/board/freescale/ls1021atwr/ls1021atwr.c
+++ b/board/freescale/ls1021atwr/ls1021atwr.c
@@ -582,6 +582,37 @@ struct smmu_stream_id dev_stream_id[] = {
{ 0x18c, 0x0e, "DEBUG" },
};
+#ifdef CONFIG_DEEP_SLEEP
+/* program the regulator (MC34VR500) to support deep sleep */
+void ls1twr_program_regulator(void)
+{
+ unsigned int i2c_bus;
+ u8 i2c_device_id;
+
+#define LS1TWR_I2C_BUS_MC34VR500 1
+#define MC34VR500_ADDR 0x8
+#define MC34VR500_DEVICEID 0x4
+#define MC34VR500_DEVICEID_MASK 0x0f
+
+ i2c_bus = i2c_get_bus_num();
+ i2c_set_bus_num(LS1TWR_I2C_BUS_MC34VR500);
+ i2c_device_id = i2c_reg_read(MC34VR500_ADDR, 0x0) &
+ MC34VR500_DEVICEID_MASK;
+ if (i2c_device_id != MC34VR500_DEVICEID) {
+ printf("The regulator (MC34VR500) does not exist. The device does not support deep sleep.\n");
+ return;
+ }
+
+ i2c_reg_write(MC34VR500_ADDR, 0x31, 0x4);
+ i2c_reg_write(MC34VR500_ADDR, 0x4d, 0x4);
+ i2c_reg_write(MC34VR500_ADDR, 0x6d, 0x38);
+ i2c_reg_write(MC34VR500_ADDR, 0x6f, 0x37);
+ i2c_reg_write(MC34VR500_ADDR, 0x71, 0x30);
+
+ i2c_set_bus_num(i2c_bus);
+}
+#endif
+
int board_init(void)
{
#ifndef CONFIG_SYS_FSL_NO_SERDES
@@ -604,6 +635,9 @@ int board_init(void)
u_qe_init();
#endif
+#ifdef CONFIG_DEEP_SLEEP
+ ls1twr_program_regulator();
+#endif
return 0;
}