[U-Boot] [PATCH] arm: ls1021atwr: program the regulator for deep sleep

[Alison Wang]

Acked-by: Alison Wang <alison.wang at freescale.com>


Zhao Chenhui-3 wrote
> Program the external regulator to switch off voltage in deep sleep.
> 
> Signed-off-by: Chenhui Zhao <

> chenhui.zhao@

> >
> ---
>  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;
>  }
>  
> -- 
> 1.9.1
> 
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