dc1sw is an on/off only regulator and as such it cannot have constraints.
This is a limitation of the kernel regulator implementation which resolves
supplies on the first regulator_get(), which is done after applying
constraints, and applying the constrains will fail because it calls
_regulator_get_voltage() and _regulator_do_set_voltage() both of which
will fail on a switch regulator when there is no supply (yet).
This causes registering of all axp22x regulators to fail with the
following errors:
[ 1.395249] vcc-lcd: failed to get the current voltage(-22)
[ 1.405131] axp20x-regulator axp20x-regulator: Failed to register dc1sw
[ 1.412436] axp20x-regulator: probe of axp20x-regulator failed with error -22
This commit removes the constrains on dc1sw / vcc-lcd fixing this problem
note that dcdc1 itself is contrained to the exact same values, so this
does not change anything.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
A23/A33 Q8 tablets have an X-Powers AXP223 PMIC connected via RSB. Its
regulators provide power to various parts of the SoC and the board.
Also add lcd regulator supply for simplefb and update the existing
vmmc-supply for mmc0.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
The Reduced Serial Bus controller is used to talk to the onboard PMIC.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
The LCD backlight on the A23/A33 Q8 format tablets is enabled
with a GPIO controlled regulator, and brightness controlled with
the SoC's PWM controller.
The backlight is powered from the AXP223 PMIC's DC1SW output,
which is not supported yet. A proper bootloader is required
to enable it.
The brightness levels are arbitrary. The FEX files do not have
such information. As such, actual brightness levels may differ
from device to device.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cheap allwinner based devices in the q8 enclosure come in many variants,
all sharing the case and a number of other basic features.
They differ in the display, touchscreen, accelerometer and wifi chips
used.
This commit adds 2 dtsi files defining the shared features of all the
q8 tablets. sunxi-q8-common.dtsi defines features shared amongst all
q8 tablets, sun8i-q8-common.dtsi defines features shared amongst all
a23 / a33 based q8 tablets, but not with a13 q8 based tablets.
a13 based tablets use a different card-detect pin for the mmc, and
use uart1 instead of the r_uart for the serial console.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
