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>
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c
index d62323e..698f755 100644
--- a/board/freescale/ls1021atwr/ls1021atwr.c
+++ b/board/freescale/ls1021atwr/ls1021atwr.c
@@ -582,6 +582,37 @@
{ 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 @@
u_qe_init();
#endif
+#ifdef CONFIG_DEEP_SLEEP
+ ls1twr_program_regulator();
+#endif
return 0;
}