[PATCH v2] board: gateworks: venice: update GW74xx PMIC config

[Tim Harvey]

Update the GW74xx PMIC configuration:
 - increase VDD_SOC DVS1 to 0.85V per datasheet
 - increase VDD_SOC DVS0 to 0.95V before first DRAM access
 - increase VDD_ARM DVS0 to 0.95V to support kernel overdrive voltage (OD)
 - remove unnecessary changes to VDD_DRAM as we don't use 3GHz DRAM
 - remove unnecessary change to LDO2 as it is unused

Signed-off-by: Tim Harvey <tharvey at gateworks.com>
v2: update commit log with more detail
---
 board/gateworks/venice/spl.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/board/gateworks/venice/spl.c b/board/gateworks/venice/spl.c
index 56a985ed668f..98931c04754e 100644
--- a/board/gateworks/venice/spl.c
+++ b/board/gateworks/venice/spl.c
@@ -156,17 +156,15 @@ static int power_init_board(void)
 		/* Buck 1 DVS control through PMIC_STBY_REQ */
 		dm_i2c_reg_write(dev, PCA9450_BUCK1CTRL, 0x59);
 
-		/* Set DVS1 to 0.8v for suspend */
-		dm_i2c_reg_write(dev, PCA9450_BUCK1OUT_DVS1, 0x10);
+		/* Set DVS1 to 0.85v for suspend */
+		dm_i2c_reg_write(dev, PCA9450_BUCK1OUT_DVS1, 0x14);
 
-		/* increase VDD_DRAM to 0.95v for 3Ghz DDR */
-		dm_i2c_reg_write(dev, PCA9450_BUCK3OUT_DVS0, 0x1C);
+		/* increase VDD_SOC to 0.95V before first DRAM access */
+		dm_i2c_reg_write(dev, PCA9450_BUCK1OUT_DVS0, 0x1C);
 
-		/* VDD_DRAM off in suspend: B1_ENMODE=10 */
-		dm_i2c_reg_write(dev, PCA9450_BUCK3CTRL, 0x4a);
-
-		/* set VDD_SNVS_0V8 from default 0.85V */
-		dm_i2c_reg_write(dev, PCA9450_LDO2CTRL, 0xC0);
+		/* Kernel uses OD/OD freq for SOC */
+		/* To avoid timing risk from SOC to ARM, increase VDD_ARM to OD voltage 0.95v */
+		dm_i2c_reg_write(dev, PCA9450_BUCK2OUT_DVS0, 0x1C);
 
 		/* set WDOG_B_CFG to cold reset */
 		dm_i2c_reg_write(dev, PCA9450_RESET_CTRL, 0xA1);
-- 
2.25.1