Imagine a situation where a device tree has a few regulators in an
appropriate node:
regulators {
sw1 {
..
};
vvideo {
..
};
:
vfake {
..
};
vtypo {
..
};
};
In the above example, the node name "vfake" is an attempt to match a
regulator name inside the driver which just so happens to not exist. The
node name "vtypo" represents an accidental typographical error in a
regulator name which may have been introduced to a device tree.
In these cases, the number of regulators the mc13892 driver thinks it has
does not match the number of regulators it parsed and registered. Since
it will go over this array based on this number, it will actually
re-register regulator "0" (which happens to be SW1) over and over
again until it reaches the number, resulting in messages on the kernel
log such as these:
SW1: at 1100 mV
VVIDEO: at 2775mV
:
SW1: at 1100 mV
SW1: at 1100 mV
.. up to that number of "mismatched" regulators. Nobody using DT can/will
consume these regulators, so it should not be possible for it to cause any
real regulator problems or driver breakages, but it is an easy thing to
miss in a kernel log and is an immediate indication of a problem with the
device tree authoring.
This patch effectively sanity checks the number of counted children of
the regulators node vs. the number that actually matched driver names,
and sets the appropriate num_regulators value. It also gives a little
warning for device tree authors that they MAY have screwed something up,
such that this patch does not hide the device tree authoring problem.
Signed-off-by: Matt Sealey <matt@genesi-usa.com>
Tested-by: Steev Klimaszewski <steev@genesi-usa.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This is not required after commit f7df20ec
"regulator: core: Use list_voltage() to read single voltage regulators"
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This function does not exist, remove the extern function declaration.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
If .is_enabled callback is not implemented, regulator core assumes that the
regulator is always on. Thus we don't need mc13xxx_sw_regulator_is_enabled
function.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Convert mc13892_sw_regulator_ops and mc13xxx_regulator_ops to set_voltage_sel.
mc13xxx_get_best_voltage_index function is not used now, remove it.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
It adds device tree probe support for mc13892-regulator driver.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
It's not really necessary to add a prefix 'MC13892__' for each mc13892
regulator name, since the chip must have been identified as mc13892
when we look at the regulator name.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
move some common functions and micros of mc13783 regulaor driver to
a seperate file, which makes it possible for mc13892 to share code.
Signed-off-by: Yong Shen <yong.shen@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Matt Sealey