On Wed, 2014-05-28 at 10:48 +0200, Linus Walleij wrote: > On Wed, May 28, 2014 at 10:36 AM, Heiko Stübner <heiko@xxxxxxxxx> wrote: > > Am Mittwoch, 28. Mai 2014, 10:15:43 schrieb Linus Walleij: > >> On Tue, May 27, 2014 at 3:09 PM, Heiko Stübner <heiko@xxxxxxxxx> wrote: > >> > Am Dienstag, 27. Mai 2014, 09:27:36 schrieb Ivan T. Ivanov: > >> >> From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx> > >> >> > >> >> Add "power-source" property to generic options used for DT parsing files. > >> >> This enables drivers, which use generic pin configurations, to get the > >> >> value passed to this property. > >> > > >> > I think the main problem here is, that pinconf-generic.h defines the > >> > power- > >> > source as having a "custom format". With DT as a hardware description, > >> > implementaton specific values do not work well - instead it should have a > >> > regular unit-value. > >> > > >> > For the power-source I think volts could work well - as this is the main > >> > use- case for pinctrl I know. The regulator-binding uses microvolts, > >> > maybe it would be good use a similar unit. > >> > >> (...) > >> > >> > pcfg_1v8 { > >> > > >> > power-source = <1800000>; > >> > > >> > }; > >> > >> I don't think this is what it's meant for actually. In this case the thing > >> would be modeled as a regulator rather than some pin control option I > >> guess? > >> > >> I think it's more like a selector, such as found on old amplifiers, > >> input source A, B or C? So it's just some discrete number. > > > > as I said, you know this better than me ;-) > > > > I was thinking more of these io-voltages, where one can select between say 1.8 > > and 3.3V for the pins. > > > > I have this somewhere on my todo list for the rockchips too. > > > > So essentially the pinctrl driver [as it is a pin-group specific setting] > > should just export regulators for these voltage settings, without touching the > > pinconfig itself, right? > > Hm hm hm. > > I am a bit in the blue actually. > > I think we need to have a discussion with Mark Brown on how to > handle this. > > We have previously had the case of MMC/SD level-shifters, where > a certain setting gives a certain level of signals out, and another setting > gives another level. Like two discrete levels. > > So we modeled that as a regulator provider inside the pin control > driver eventually, see sh-pfc/pfc-sh73a0.c > > But this is different: it is the power of the pin itself. > > I can think of a "padring regulator" hooking in as part of the pin state > but have no clear idea on how to actually do that. We need some > coding I think. > In my case this is just a switch, which can select from different power sources and these sources are external from the chip. So I can't know a priory what the levels are and hard code them inside the driver. Thanks, Ivan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html