This was introduced in commit

        876989d5 (mfd: Add device tree probe support for mc13xxx)

for spi and later while introducing support for i2c copied to the i2c
driver.

Modifying driver details is very strange, for example probing an
mc13892 device (instantiated via dt) removes the driver's ability to
handle (traditionally probed) mc13783 devices in this case.
I'm not aware of any problems that make this hack necessary and if
there were some, they'd have to be fixed in the spi/i2c core, not in
a driver.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

The MC13xxx PMIC is mainly used on i.Mx SoC. On those SoC the SPI
hardware will deassert CS line as soon as the SPI FIFO is empty.
The MC13xxx hardware is very sensitive to CS line change as it
corrupts the transfer if CS is deasserted in the middle of a register
read or write.
It is not possible to use the CS line as a GPIO on some SoC, so we
need to workaround this by implementing a single SPI transfer to
access the PMIC.
Reviewed-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: NMarc Reilly <marc@cpdesign.com.au>
Signed-off-by: NPhilippe Rétornaz <philippe.retornaz@epfl.ch>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This fix the SPI regmap configuration, the wrong write flag was used.
Also, bits_per_word should not be set as the regmap spi implementation
uses a 8bits transfert granularity.
Signed-off-by: NPhilippe Rétornaz <philippe.retornaz@epfl.ch>
Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This patch fixes conflict between commit 8ae3559
"mfd: mc13xxx workaround SPI hardware bug on i.Mx"
and commit 10c7a5d "mfd: Use devm_* APIs for mc13xxx".

commit 8ae3559 changes regmap_init_spi to regmap_init.
So now we need to use devm_regmap_init rather than devm_regmap_init_spi.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

The MC13xxx PMIC is mainly used on i.Mx SoC. On those SoC the SPI
hardware will deassert CS line as soon as the SPI FIFO is empty.
The MC13xxx hardware is very sensitive to CS line change as it
corrupts the transfer if CS is deasserted in the middle of a register
read or write.
It is not possible to use the CS line as a GPIO on some SoC, so we
need to workaround this by implementing a single SPI transfer to
access the PMIC.
Reviewed-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: NMarc Reilly <marc@cpdesign.com.au>
Signed-off-by: NPhilippe Rétornaz <philippe.retornaz@epfl.ch>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This fix the SPI regmap configuration, the wrong write flag was used.
Also, bits_per_word should not be set as the regmap spi implementation
uses a 8bits transfert granularity.
Signed-off-by: NPhilippe Rétornaz <philippe.retornaz@epfl.ch>
Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

All spi specific code is moved into a new module. The mc13xxx struct
moves to a new local include file by necessity.

A new config choice selects the SPI bus type support and by default is
value of SPI_MASTER to remain compatible with existing configs.
Signed-off-by: NMarc Reilly <marc@cpdesign.com.au>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>