hw21/26: optimize extension module powerup

Enable extension module power in first state loader.
Reasoning: Unpowered module can block I2C bus.

board/nm/nmhw21/board.c

@@ -794,6 +794,29 @@ static void init_bd_spl(void)
 	}
 }
 
+static void power_um(void) 
+{
+	int bus;
+
+	da9063_init(CONFIG_PMIC_I2C_BUS);
+
+	bus = da9063_claim_i2c_bus();
+
+	REQUEST_AND_CLEAR_GPIO(GPIO_RST_UM_N);		/* Assert reset (active low) */
+	REQUEST_AND_CLEAR_GPIO(GPIO_CTRL_WDIS_N);
+
+	da9063_set_gpio(PMIC_UM_SUPPLY_EN_IO, 0);	/* Switch Supply off */
+	mdelay(30);					/* Give time to discharge output */
+
+	da9063_set_gpio(PMIC_UM_SUPPLY_VSEL_IO, 0);	/* Set voltage to 3.3V */
+	mdelay(1);
+
+	da9063_set_gpio(PMIC_UM_SUPPLY_EN_IO, 1);	/* Enable Supply */
+	mdelay(10);
+
+	da9063_release_i2c_bus(bus);
+}
+
 void am33xx_spl_board_init(void)
 {
 	/* Set CPU speed to 600 MHz (fix) */
@@ -805,6 +828,9 @@ void am33xx_spl_board_init(void)
 	/* Configure both I2C buses used */
 	init_i2c();
 
+	/* Power on Extension/User module, so it doesn't block I2C bus */
+	power_um();
+
 	/* Get board descriptor */
 	init_bd_spl();
 
@@ -1052,17 +1078,7 @@ static void init_user_module(void)
 	puts("UM:    ");
 
 	REQUEST_AND_CLEAR_GPIO(GPIO_RST_UM_N);		/* Assert reset (active low) */
-	REQUEST_AND_CLEAR_GPIO(GPIO_CTRL_WDIS_N)	/* TODO: CHECK */
-
-	/* TODO: Should this be done at first power up as well? */
-	da9063_set_gpio(PMIC_UM_SUPPLY_EN_IO, 0);	/* Switch Supply off */
-	mdelay(30);					/* Give time to discharge output */
-
-	da9063_set_gpio(PMIC_UM_SUPPLY_VSEL_IO, 0);	/* Set voltage to 3.3V */
-	mdelay(1);
-
-	da9063_set_gpio(PMIC_UM_SUPPLY_EN_IO, 1);	/* Enable Supply */
-	mdelay(10);
+	REQUEST_AND_CLEAR_GPIO(GPIO_CTRL_WDIS_N);
 
 	gpio_direction_input(GPIO_RST_UM_N);		/* Release reset (open drain) */
 	mdelay(10);

board/nm/nmhw21/mux.c

@@ -38,7 +38,7 @@ static struct module_pin_mux gpio_pin_mux[] = {
 	* (T16) GPIO1_26: WLAN_EN
 	* (V17) GPIO1_27: WLAN_IRQ
 	*
-	* (U3) GPIO2_16: TIMEPULSE (HW26)
+	* (U3) GPIO2_16: TIMEPULSE (HW26), see note [1]
 	* (R6) GPIO2_25: RST_ETH~
 	*
 	* (J17) GPIO3_4: GNSS_EXTINT
@@ -46,6 +46,9 @@ static struct module_pin_mux gpio_pin_mux[] = {
 	* (L18) GPIO3_10: CTRL.RST
 	* (C12) GPIO3_17: UI_RST~
 	* (A14) GPIO3_21: RST_HUB~ (USB)
+	*
+	* [1] No PU/PD allowed as TIMEPULSE is internally connected with SAFEBOOT_N.
+	*     SAFEBOOT_N must be left open/floating.
 	*/
 
 	/* Bank 0 */
@@ -65,7 +68,7 @@ static struct module_pin_mux gpio_pin_mux[] = {
 	{OFFSET(gpmc_a11), (MODE(7) | PULLUDDIS | RXACTIVE)},			/* (V17) gpio1_27: WLAN_IRQ */
 
 	/* Bank 2 */
-	{OFFSET(lcd_data10), (MODE(7) | PULLUDEN | PULLDOWN_EN | RXACTIVE)},	/* (U3) GPIO2_16: TIMEPULSE input */
+	{OFFSET(lcd_data10), (MODE(7) | PULLUDDIS | RXACTIVE)},			/* (U3) GPIO2_16: TIMEPULSE */
 	{OFFSET(lcd_ac_bias_en), (MODE(7) | PULLUDDIS)},			/* (R6) GPIO2_25: RST_ETH~ */
 
 	/* Bank 3 */
@@ -215,8 +218,8 @@ static struct module_pin_mux uart2_pin_mux[] = {
 
 /* UART3: GNSS */
 static struct module_pin_mux uart3_pin_mux[] = {
-	{OFFSET(mii1_rxd3), (MODE(1) | PULLUDEN | PULLUP_EN | RXACTIVE)},	/* (L17) UART3_RXD */
-	{OFFSET(mii1_rxd2), (MODE(1) | PULLUDEN | PULLUP_EN | SLEWCTRL)},	/* (L16) UART3_TXD */
+	{OFFSET(mii1_rxd3), (MODE(1) | PULLUDDIS | RXACTIVE)},			/* (L17) UART3_RXD */
+	{OFFSET(mii1_rxd2), (MODE(1) | PULLUDDIS | SLEWCTRL)},			/* (L16) UART3_TXD */
 	{-1}
 };