Hi Tim, On Fri, Oct 31, 2014 at 2:27 AM, Tim Harvey <[email protected]> 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 <[email protected]> > Cc: Shawn Guo <[email protected]> > Signed-off-by: Tim Harvey <[email protected]> > --- > 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
