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

Tim Harvey
2014-04-23T04:53:59Z

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@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);
+ }
+ }
+ }
+}
+
/* 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>
--
1.8.3.2