ldo->en_pin is set iff the regulator is enabled by external pin.

This patch sets ldo->en_pin to NULL if lp8788_gpio_request_ldo_en() fails, then
we can use it to determinate if the regulator is controlled by external pin or
register.

lp8788_get_ldo_enable_mode(), lp8788_ldo_ctrl_by_extern_pin() and
lp8788_ldo_is_enabled_by_extern_pin() functions are not used now, remove them.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NMilo Kim <milo.kim@ti.com>
Tested-by: NMilo Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

 Use 'platform_device' rather than i2c client device node.
 Argument is added in lp8788_config_ldo_enable_mode().
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

 The lp8788-ldo is a platform driver of lp8788-mfd.
 The platform device is allocated when mfd_add_devices() is called
 in lp8788-mfd.
 On the other hand, 'lp->dev' is the i2c client device.

 Therefore, this 'platform_device' is a proper parent device in case of
 resource managed mem alloc, registering regulators and device kernel messages.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

To clear the mask bit, setting data argument to be 0 with proper mask setting
for lp8788_update_bits. We don't need the var array here.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

CONFIG_HOTPLUG is going away as an option so __devexit is no
longer needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

For fixed voltage, the n_voltages should be 1 rather than 0.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

TI LP8788 PMU has 4 BUCKS and 22 LDOs.
The voltage of BUCK1 and BUCK2 can be controlled by external gpios.
And some LDOs also can be enabled by external gpios.
The regmap interface is used for regulator operations.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>