Program the external regulator to switch off voltage in deep sleep.
Signed-off-by: Chenhui Zhao chenhui.zhao@freescale.com --- board/freescale/ls1021atwr/ls1021atwr.c | 34 +++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c index 2c8d6d1..37ec0ba 100644 --- a/board/freescale/ls1021atwr/ls1021atwr.c +++ b/board/freescale/ls1021atwr/ls1021atwr.c @@ -578,6 +578,37 @@ 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 @@ -600,6 +631,9 @@ int board_init(void) u_qe_init(); #endif
+#ifdef CONFIG_DEEP_SLEEP + ls1twr_program_regulator(); +#endif return 0; }