ti: remove usage of DM_I2C_COMPAT and don't disable DM_I2C in SPL

DM_I2C_COMPAT is a compatibility layer that allows using the non-DM I2C
API when DM_I2C is used. The goal is to eventually remove DM_I2C_COMPAT
when all I2C "clients" have been migrated to use the DM API.
This a step in that direction for the TI based platforms.
Build tested with buildman:
buildman -dle am33xx ti omap3 omap4 omap5 davinci keystone

boot tested with:
am335x_evm, am335x_boneblack, am335x_boneblack_vboot (DM version),
am57xx_evm, dra7xx_evm, k2g_evm, am437x_evm

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c
index 2a59b06..31bc0f4 100644
--- a/board/ti/am43xx/board.c
+++ b/board/ti/am43xx/board.c
@@ -43,6 +43,8 @@
 #ifdef CONFIG_TI_I2C_BOARD_DETECT
 void do_board_detect(void)
 {
+	/* Ensure I2C is initialized for EEPROM access*/
+	gpi2c_init();
 	if (ti_i2c_eeprom_am_get(CONFIG_EEPROM_BUS_ADDRESS,
 				 CONFIG_EEPROM_CHIP_ADDRESS))
 		printf("ti_i2c_eeprom_init failed\n");
@@ -386,8 +388,13 @@
 {
 	int mpu_vdd, ddr_volt;
 
+#ifndef CONFIG_DM_I2C
 	if (i2c_probe(TPS65218_CHIP_PM))
 		return;
+#else
+	if (power_tps65218_init(0))
+		return;
+#endif
 
 	switch (m) {
 	case 1000:
@@ -439,8 +446,13 @@
 {
 	int mpu_vdd;
 
+#ifndef CONFIG_DM_I2C
 	if (i2c_probe(TPS62362_I2C_ADDR))
 		return;
+#else
+	if (power_tps62362_init(0))
+		return;
+#endif
 
 	switch (m) {
 	case 1000:
@@ -462,14 +474,12 @@
 		puts("Unknown MPU clock, not scaling\n");
 		return;
 	}
-
 	/* Set VDD_MPU voltage */
 	if (tps62362_voltage_update(TPS62362_SET3, mpu_vdd)) {
 		printf("%s failure\n", __func__);
 		return;
 	}
 }
-
 void gpi2c_init(void)
 {
 	/* When needed to be invoked prior to BSS initialization */
@@ -477,8 +487,10 @@
 
 	if (first_time) {
 		enable_i2c0_pin_mux();
+#ifndef CONFIG_DM_I2C
 		i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED,
 			 CONFIG_SYS_OMAP24_I2C_SLAVE);
+#endif
 		first_time = false;
 	}
 }
@@ -614,20 +626,32 @@
 /* setup board specific PMIC */
 int power_init_board(void)
 {
-	struct pmic *p;
-
+	int rc;
+#ifndef CONFIG_DM_I2C
+	struct pmic *p = NULL;
+#endif
 	if (board_is_idk()) {
-		power_tps62362_init(I2C_PMIC);
+		rc = power_tps62362_init(0);
+		if (rc)
+			goto done;
+#ifndef CONFIG_DM_I2C
 		p = pmic_get("TPS62362");
-		if (p && !pmic_probe(p))
-			puts("PMIC:  TPS62362\n");
+		if (!p || pmic_probe(p))
+			goto done;
+#endif
+		puts("PMIC:  TPS62362\n");
 	} else {
-		power_tps65218_init(I2C_PMIC);
+		rc = power_tps65218_init(0);
+		if (rc)
+			goto done;
+#ifndef CONFIG_DM_I2C
 		p = pmic_get("TPS65218_PMIC");
-		if (p && !pmic_probe(p))
-			puts("PMIC:  TPS65218\n");
+		if (!p || pmic_probe(p))
+			goto done;
+#endif
+		puts("PMIC:  TPS65218\n");
 	}
-
+done:
 	return 0;
 }