[U-Boot] [PATCH 4/4] [PATCH] ventana: Add support for the LTC3676 PMIC

[Stefano Babic]

On 23/04/2014 06:53, Tim Harvey wrote:
> The LTC3676 PMIC is used instead of the PFUZE100 PMIC on the
> GW51xx/GW52xx/GW53xx Ventana baseboards. In order to support the IMX6Q SoC
> at 1GHz on those baseboards, we need to adjust the voltage scaling for the SW1
> and SW3 DC/DC converters on the LTC3676 for 1225mV. Note that the scalar
> values for the LTC3676 are board-specific as they relate to a resistor devider
> chosen by the board design.
> 
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>
> ---
>  board/gateworks/gw_ventana/gw_ventana.c | 79 ++++++++++++++++++++++++---------
>  include/configs/gw_ventana.h            |  2 +
>  2 files changed, 59 insertions(+), 22 deletions(-)
> 
> diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
> index 48e90e0..29fcebe 100644
> --- a/board/gateworks/gw_ventana/gw_ventana.c
> +++ b/board/gateworks/gw_ventana/gw_ventana.c
> @@ -30,6 +30,7 @@
>  #include <mtd_node.h>
>  #include <netdev.h>
>  #include <power/pmic.h>
> +#include <power/ltc3676_pmic.h>
>  #include <power/pfuze100_pmic.h>
>  #include <i2c.h>
>  #include <fdt_support.h>
> @@ -733,6 +734,60 @@ struct ventana gpio_cfg[] = {
>  	},
>  };
>  
> +/* setup board specific PMIC */
> +static void setup_board_pmic(int board)
> +{
> +	struct pmic *p;
> +	u32 reg;
> +
> +	/* configure PFUZE100 PMIC */
> +	if (board_type == GW54xx || board_type == GW54proto) {
> +		power_pfuze100_init(I2C_PMIC);
> +		p = pmic_get("PFUZE100_PMIC");
> +		if (p && !pmic_probe(p)) {
> +			pmic_reg_read(p, PFUZE100_DEVICEID, &reg);
> +			printf("PMIC:  PFUZE100 ID=0x%02x\n", reg);
> +
> +			/* Set VGEN1 to 1.5V and enable */
> +			pmic_reg_read(p, PFUZE100_VGEN1VOL, &reg);
> +			reg &= ~(LDO_VOL_MASK);
> +			reg |= (LDOA_1_50V | LDO_EN);
> +			pmic_reg_write(p, PFUZE100_VGEN1VOL, reg);
> +
> +			/* Set SWBST to 5.0V and enable */
> +			pmic_reg_read(p, PFUZE100_SWBSTCON1, &reg);
> +			reg &= ~(SWBST_MODE_MASK | SWBST_VOL_MASK);
> +			reg |= (SWBST_5_00V | SWBST_MODE_AUTO);
> +			pmic_reg_write(p, PFUZE100_SWBSTCON1, reg);
> +		}
> +	}
> +
> +	/* configure LTC3676 PMIC */
> +	else {
> +		power_ltc3676_init(I2C_PMIC);
> +		p = pmic_get("LTC3676_PMIC");
> +		if (p && !pmic_probe(p)) {
> +			puts("PMIC:  LTC3676\n");
> +			/* set board-specific scalar to 1225mV for IMX6Q at 1GHz */
> +			if (is_cpu_type(MXC_CPU_MX6Q)) {
> +				/* mask PGOOD during SW1 transition */
> +				reg = 0x1d | LTC3676_PGOOD_MASK;
> +				pmic_reg_write(p, LTC3676_DVB1B, reg);
> +				/* set SW1 (VDD_SOC) to 1259mV */
> +				reg = 0x1d;
> +				pmic_reg_write(p, LTC3676_DVB1A, reg);
> +
> +				/* mask PGOOD during SW3 transition */
> +				reg = 0x1d | LTC3676_PGOOD_MASK;
> +				pmic_reg_write(p, LTC3676_DVB3B, reg);
> +				/*set SW3 (VDD_ARM) to 1259mV */
> +				reg = 0x1d;
> +				pmic_reg_write(p, LTC3676_DVB3A, reg);
> +			}
> +		}
> +	}
> +}

There is already a power_init_board(), defined as __weak, that you can
use here.

> +
>  /* setup GPIO pinmux and default configuration per baseboard */
>  static void setup_board_gpio(int board)
>  {
> @@ -1076,29 +1131,9 @@ int misc_init_r(void)
>  		setenv("serial#", str);
>  	}
>  
> -	/* configure PFUZE100 PMIC (not used on all Ventana baseboards) */
> -	power_pfuze100_init(I2C_PMIC);
> -	if (board_type == GW54xx || board_type == GW54proto) {
> -		struct pmic *p = pmic_get("PFUZE100_PMIC");
> -		u32 reg;
> -
> -		if (p && !pmic_probe(p)) {
> -			pmic_reg_read(p, PFUZE100_DEVICEID, &reg);
> -			printf("PMIC:  PFUZE100 ID=0x%02x\n", reg);
> -
> -			/* Set VGEN1 to 1.5V and enable */
> -			pmic_reg_read(p, PFUZE100_VGEN1VOL, &reg);
> -			reg &= ~(LDO_VOL_MASK);
> -			reg |= (LDOA_1_50V | LDO_EN);
> -			pmic_reg_write(p, PFUZE100_VGEN1VOL, reg);
>  
> -			/* Set SWBST to 5.0V and enable */
> -			pmic_reg_read(p, PFUZE100_SWBSTCON1, &reg);
> -			reg &= ~(SWBST_MODE_MASK | SWBST_VOL_MASK);
> -			reg |= (SWBST_5_00V | SWBST_MODE_AUTO);
> -			pmic_reg_write(p, PFUZE100_SWBSTCON1, reg);
> -		}
> -	}
> +	/* setup pmic */
> +	setup_board_pmic(board_type);
>  
>  	/* setup baseboard specific GPIO pinmux and config */
>  	setup_board_gpio(board_type);
> diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
> index 3398390..b984f27 100644
> --- a/include/configs/gw_ventana.h
> +++ b/include/configs/gw_ventana.h
> @@ -136,6 +136,8 @@
>  #define CONFIG_POWER_I2C
>  #define CONFIG_POWER_PFUZE100
>  #define CONFIG_POWER_PFUZE100_I2C_ADDR	0x08
> +#define CONFIG_POWER_LTC3676
> +#define CONFIG_POWER_LTC3676_I2C_ADDR  0x3c
>  
>  /* Various command support */
>  #include <config_cmd_default.h>
> 

Best regards,
Stefano Babic

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