[PATCH v2 1/1] ARM: i.MX8M: add PCA9450 PMIC on rev-b EVK

[Johannes Schneider]

Configure and setup the PMIC found on rev-b EVKs.
The code is algiend with how imx8mn-evk handles both
PMIC variants: pca9450 vs bd71837

Signed-off-by: Johannes Schneider <johannes.schneider at leica-geosystems.com>
---
 arch/arm/boards/nxp-imx8mm-evk/lowlevel.c | 51 +++++++++++++++--------
 1 file changed, 34 insertions(+), 17 deletions(-)

diff --git a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
index 6132df53ec..409554c2d5 100644
--- a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
+++ b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
@@ -16,6 +16,7 @@
 #include <mach/iomux-mx8mm.h>
 #include <mach/imx8m-ccm-regs.h>
 #include <mfd/bd71837.h>
+#include <mfd/pca9450.h>
 #include <mach/xload.h>
 #include <soc/imx8m/ddr.h>
 #include <image-metadata.h>
@@ -38,6 +39,25 @@ static void setup_uart(void)
 	putc_ll('>');
 }
 
+static struct pmic_config pca9450_cfg[] = {
+	/* BUCKxOUT_DVS0/1 control BUCK123 output */
+	{ PCA9450_BUCK123_DVS, 0x29 },
+	/*
+	 * increase VDD_SOC to typical value 0.95V before first
+	 * DRAM access, set DVS1 to 0.85v for suspend.
+	 * Enable DVS control through PMIC_STBY_REQ and
+	 * set B1_ENMODE=1 (ON by PMIC_ON_REQ=H)
+	 */
+	{ PCA9450_BUCK1OUT_DVS0, 0x1C },
+	/* Set DVS1 to 0.85v for suspend */
+	/* Enable DVS control through PMIC_STBY_REQ and set B1_ENMODE=1 (ON by PMIC_ON_REQ=H) */
+	{ PCA9450_BUCK1OUT_DVS1, 0x14 },
+	{ PCA9450_BUCK1CTRL, 0x59 },
+
+	/* set WDOG_B_CFG to cold reset */
+	{ PCA9450_RESET_CTRL, 0xA1 },
+};
+
 static struct pmic_config bd71837_cfg[] = {
 	/* decrease RESET key long push time from the default 10s to 10ms */
 	{ BD718XX_PWRONCONFIG1, 0x0 },
@@ -51,21 +71,6 @@ static struct pmic_config bd71837_cfg[] = {
 	{ BD718XX_REGLOCK, 0x11 },
 };
 
-static void power_init_board(void)
-{
-	struct pbl_i2c *i2c;
-
-	imx8mm_setup_pad(IMX8MM_PAD_I2C1_SCL_I2C1_SCL);
-	imx8mm_setup_pad(IMX8MM_PAD_I2C1_SDA_I2C1_SDA);
-
-	imx8mm_early_clock_init();
-	imx8m_ccgr_clock_enable(IMX8M_CCM_CCGR_I2C1);
-
-	i2c = imx8m_i2c_early_init(IOMEM(MX8MQ_I2C1_BASE_ADDR));
-
-	pmic_configure(i2c, 0x4b, bd71837_cfg, ARRAY_SIZE(bd71837_cfg));
-}
-
 extern struct dram_timing_info imx8mm_evk_dram_timing;
 
 static void start_atf(void)
@@ -78,8 +83,20 @@ static void start_atf(void)
 	if (current_el() != 3)
 		return;
 
-	power_init_board();
-	imx8mm_ddr_init(&imx8mm_evk_dram_timing, DRAM_TYPE_LPDDR4);
+	imx8mm_setup_pad(IMX8MM_PAD_I2C1_SCL_I2C1_SCL);
+	imx8mm_setup_pad(IMX8MM_PAD_I2C1_SDA_I2C1_SDA);
+
+	imx8mm_early_clock_init();
+	imx8m_ccgr_clock_enable(IMX8M_CCM_CCGR_I2C1);
+
+	i2c = imx8m_i2c_early_init(IOMEM(MX8MM_I2C1_BASE_ADDR));
+
+	imx8mm_ddr_init(&imx8mm_evk_lpddr4_timing, DRAM_TYPE_LPDDR4);
+	if (i2c_dev_probe(i2c, 0x25, true) == 0) {
+		pmic_configure(i2c, 0x25, pca9450_cfg, ARRAY_SIZE(pca9450_cfg));
+	} else {
+		pmic_configure(i2c, 0x4b, bd71837_cfg, ARRAY_SIZE(bd71837_cfg));
+	}
 
 	imx8mm_load_and_start_image_via_tfa();
 }
-- 
2.25.1