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 (file)
--- 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;
 }