Messages in this thread | | | Date | Fri, 15 Apr 2016 17:17:46 +0530 | From | Laxman Dewangan <> | Subject | Re: [PATCH 7/7] pinctrl: tegra: Add driver to configure voltage and power state of io pads |
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On Friday 15 April 2016 04:45 PM, Linus Walleij wrote: > On Fri, Apr 15, 2016 at 11:55 AM, Laxman Dewangan <ldewangan@nvidia.com> wrote: >> On Friday 15 April 2016 02:55 PM, Linus Walleij wrote: >>> If the pin could actually set a voltage level it would have a regulator. >>> I don't believe that. I think it is selecting one of two rails which >>> could theoretically hold two totally different voltages. >>> >>> And that is what power-source is about. >> The IO rails connected to PMIC rail and connection does not get change. >> We change the voltage of PMIC rails via regulator calls. And then configure >> pads for the new voltage. > Aha I get it! So you adjust something in the I/O-cell so that it is adapted > for the new voltage. > > OK that seems to be something new. I suspect > power-voltage-select = <n>; where N i in uV would solve this? > (We should use uV since regulators use this.)
Thanks for new property. I will make the unit and type same as the regulator framework.
> > But to be sure we would like to know what is actually happening, > electronically speaking, when you set this up. Do you have any > idea? >
From electronic point of view, the value of VIL, VIH, VOL, VOH (Input/output voltage level for low and high state) are different when talking for 0 t 1.8V and 0 to 3.3V.
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