On 06/25/2013 09:39 AM, Linus Walleij wrote: > On Tue, Jun 25, 2013 at 3:50 PM, James Hogan <james.ho...@imgtec.com> wrote: >> On 25/06/13 14:32, Linus Walleij wrote: > >>> Patches adding it back in with SI measures will be welcomed! >> >> Okay. >> >> So the most descriptive documentation I can find for the slew rate in >> the TZ1090 pin config hardware is basically: >> >> 0: slow (half frequency) >> 1: fast >> >> Sounds like this pretty much precludes it from having a generic DT >> binding unless it can be mapped to some physical value, so I'll add a >> tz1090,slew-rate and use PIN_CONFIG_END+1 instead of PIN_CONFIG_SLEW_RATE. > > Okay... ut the Nomadik pin controller incidentally have a > similar definition: NMK_GPIO_LOWEMI. By slashing the > slew rate in half the EMI is of course reduced so that was > another name for the same thing. > > Maybe this is something that should just be boolean? > > slewrate-reduced-slope;
Tegra has, IIRC, 4 different slew rates. I'm not sure that a Boolean/dual-state value would be appropriate here; it'd be limited to supporting some arbitrary cases rather than being something generic. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
