feat(allwinner): allow to skip PMIC regulator setup
For somewhat historical reasons we are doing some initial PMIC regulator
setup in BL31, as U-Boot does not (yet) have a PMIC driver. This worked
fine so far, but there is at least one board (OrangePi 3) that gets upset,
because the Ethernet PHY needs some *coordinated* bringup of *two*
regulators.
To avoid custom hacks, let's introduce a build option to keep doing the
regulator setup in TF-A. Defining SUNXI_SETUP_REGULATORS to 0 will break
support for some devices on some boards in U-Boot (Ethernet and HDMI),
but will allow to bring up the OrangePi 3 in Linux correctly. We keep
the default at 1 to not change the behaviour for all other boards.
After U-Boot gained proper PMIC support at some point in the future, we
will probably change the default to 0, to get rid of the less optimal
PMIC code in TF-A.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Change-Id: Ie8e2583d0396f6eeaae8ffe6b6190f27db63e2a7
diff --git a/drivers/allwinner/axp/common.c b/drivers/allwinner/axp/common.c
index 143fb0f..f1250b0 100644
--- a/drivers/allwinner/axp/common.c
+++ b/drivers/allwinner/axp/common.c
@@ -48,6 +48,7 @@
axp_setbits(0x32, BIT(7));
}
+#if SUNXI_SETUP_REGULATORS == 1
/*
* Retrieve the voltage from a given regulator DTB node.
* Both the regulator-{min,max}-microvolt properties must be present and
@@ -208,3 +209,4 @@
axp_setbits(0x11, BIT(7));
}
}
+#endif /* SUNXI_SETUP_REGULATORS */