rockchip: puma-rk3399: update board_init()

The original initialisation code for board_init() was largely lifted
from the code on the EVB.  However, the RK3399-Q7 can do with a much
more concise init sequence.

This cleans up the board_init() by updating it to the essentials for
the RK3399-Q7 and getting rid of the accumulated cruft.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/theobroma-systems/puma_rk3399/puma-rk3399.c

@@ -19,44 +19,16 @@ DECLARE_GLOBAL_DATA_PTR;
 
 int board_init(void)
 {
-	struct udevice *pinctrl, *regulator;
 	int ret;
 
 	/*
-	 * The PWM does not have decicated interrupt number in dts and can
-	 * not get periph_id by pinctrl framework, so let's init them here.
-	 * The PWM2 and PWM3 are for pwm regulators.
+	 * We need to call into regulators_enable_boot_on() again, as the call
+	 * during SPL may have not included all regulators.
 	 */
-	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
-	if (ret) {
-		debug("%s: Cannot find pinctrl device\n", __func__);
-		goto out;
-	}
-
-	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_PWM2);
-	if (ret) {
-		debug("%s PWM2 pinctrl init fail!\n", __func__);
-		goto out;
-	}
-
-	/* rk3399 need to init vdd_center to get the correct output voltage */
-	ret = regulator_get_by_platname("vdd_center", &regulator);
+	ret = regulators_enable_boot_on(false);
 	if (ret)
-		debug("%s: Cannot get vdd_center regulator\n", __func__);
-
-	ret = regulator_get_by_platname("vcc5v0_host", &regulator);
-	if (ret) {
-		debug("%s vcc5v0_host init fail! ret %d\n", __func__, ret);
-		goto out;
-	}
-
-	ret = regulator_set_enable(regulator, true);
-	if (ret) {
-		debug("%s vcc5v0-host-en set fail!\n", __func__);
-		goto out;
-	}
+		debug("%s: Cannot enable boot on regulator\n", __func__);
 
-out:
 	return 0;
 }