regulator: anatop: Set default voltage selector for vddpu

commit fe08be3e upstream.

The code reads the default voltage selector from its register. If the
bootloader disables the regulator, the default voltage selector will be
0 which results in faulty behaviour of this regulator driver.

This patch sets a default voltage selector for vddpu if it is not set in
the register.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/regulator/anatop-regulator.c

@@ -283,6 +283,14 @@ static int anatop_regulator_probe(struct platform_device *pdev)
 			sreg->sel = 0;
 			sreg->bypass = true;
 		}
+
+		/*
+		 * In case vddpu was disabled by the bootloader, we need to set
+		 * a sane default until imx6-cpufreq was probed and changes the
+		 * voltage to the correct value. In this case we set 1.25V.
+		 */
+		if (!sreg->sel && !strcmp(sreg->name, "vddpu"))
+			sreg->sel = 22;
 	} else {
 		rdesc->ops = &anatop_rops;
 	}