The SD, ALDO, and DLDO vlotage tables are composed of linear ranges.
This patch converts as3711 to use newly introduced helpers for multiple
linear ranges.

Below is the voltage table on datasheet:

SD:
00h:     DC/DC powered down
01h-40h: Volt = 0.6V + sdx_vsel * 12.5mV
41h-70h: Volt = 1.4V + (sdx_vsel - 40h) * 25mV
71h-7Fh: Volt = 2.6V + (sdx_vsel - 70h) * 50mV

ALDO:
0h-0Fh:  1.2V + ldox_vsel * 50mV
10h-1Fh: 1.8V + (ldox_vsel - 10h) * 100mV

DLDO:
00h-10h: Volt = 0.9V + ldox_vsel * 50mV
11h-1fh: Do not use
20h-3fh: Volt = 1.75V + (ldox_vsel - 20h) * 50mV

Note, when convert to use linear ranges APIs, the equation for SD needs below
adjustment because the linear ranges APIs wiil substract range->min_sel when
apply the equation.

SD ( the equation to be used with linear ranges APIs )
01h-40h: Volt = 0.6125V + (sdx_vsel - 1h) * 12.5mV
41h-70h: Volt = 1.425V + (sdx_vsel - 41h) * 25mV
71h-7Fh: Volt = 2.650V + (sdx_vsel - 71h) * 50mV
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

The same table can be used for multiple instance of pdev, so we don't need to
allocate memory for of_regulator_match table per pdev.

match->driver_data points to the corresponding entry of as3711_reg_info,
however it is not used in current code, thus this patch does not set
driver_data in the of_regulator_match table.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

AS3711 regulator OF support only evaluates standard regulator DT
properties.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Reviwed-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

To skip registering regulator if no platform initialization data,
we should check reg_data rather than ri->desc.name.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Below equation means the "voltage" is the "smallest" voltage within specific
range.

ret = DIV_ROUND_UP(min - bottom) / step;
voltage = ret * step + bottom;

If we do try 1 down when (voltage > max), new voltage is then less than min
voltage. Which means the new voltage is not in the requested voltage range.

This patch also includes below cleanups:
- Use DIV_ROUND_UP
- rename variable 'ret' to 'sel' for better readability because as3711_sel_check
  returns the selector.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Below cases are supposed to be valid:

min_uV == max_uV == info->max_uV
min_uV == max_uV == rdev->desc->min_uV

Don't return -EINVAL for above cases.

This patch also includes below cleanups:
- Use rdev_get_drvdata(rdev) instead of rdev->reg_data.
- Remove unnecessary WARN_ON, it looks pointless.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

This driver supports the 4 DCDC and 8 LDO regulators on the AS3711 PMIC.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>