[PATCH 4/5] cpufreq: imx6q: add ldo-bypass support

Hi Tim,

On Fri, Oct 31, 2014 at 2:27 AM, Tim Harvey [off-list ref] wrote:

When an external PMIC is used for VDD_SOC and VDD_ARM you can save power by
bypassing the internal LDO's provided by the anantop regulator as long as
you are running less than 1.2GHz. If running at 1.2GHz the IMX6 datasheets
state that you must use the internal LDO's to reduce ripple on the suplies.

A failure to bypass the LDO's when using an external PMIC will result in an
extra voltage drop (~125mV) between VDD_ARM_IN and VDD_ARM and VDD_SOC_IN and
VDD_SOC which violates the voltages specificed by the datasheets.

Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Shawn Guo <redacted>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 drivers/cpufreq/imx6q-cpufreq.c | 51 +++++++++++++++++++++++++++++++++++++++++

Shouldn't the LDO bypass support be added into the anatop regulator
driver instead?

What if someone wants to use LDO bypass and not use the cpufreq driver?