From 933db81c0494f692bbd384db11f7bab43706c87c Mon Sep 17 00:00:00 2001 From: chenhui zhao Date: Fri, 15 May 2015 14:42:30 +0800 Subject: [PATCH] armv7/ls1021atwr: program the regulator for deep sleep Program the external regulator to switch off voltage in deep sleep. Signed-off-by: Chenhui Zhao Acked-by: Alison Wang Reviewed-by: York Sun --- 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 d62323e3ed..698f755033 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; } -- 2.39.5