On Friday 09 October 2015 11:02:01 Tirdea, Irina wrote: > > -----Original Message----- > > From: linux-input-owner@xxxxxxxxxxxxxxx [mailto:linux-input-owner@xxxxxxxxxxxxxxx] On Behalf Of Arnd Bergmann > > Sent: 08 October, 2015 17:32 > > To: Tirdea, Irina > > Cc: Dmitry Torokhov; Bastien Nocera; Aleksei Mamlin; linux-input@xxxxxxxxxxxxxxx; Mark Rutland; Purdila, Octavian; linux- > > kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx > > Subject: Re: [PATCH v8 0/9] Goodix touchscreen enhancements > > > > On Thursday 08 October 2015 17:23:42 Irina Tirdea wrote: > > > Add several enhancements to the Goodix touchscreen driver. > > > > > > The new functionality is only available for devices that > > > declare named gpio pins for interrupt and reset in their > > > ACPI/DT configuration. > > > > > > Thanks, > > > Irina > > > > > > Changes in v8: > > > - only allow new functionality for devices that declare named > > > gpios (using _DSD properties in ACPI or named DT properties) > > > > > > > > > > Looks much cleaner this way, thanks! > > > > One remaining question: how would you handle the case where > > the hardware doesn't support configuring the int-gpios line > > as output but you still want to use the named gpios? > > > > The only reason to use named gpios is to enable the new functionality > introduced by this patch set (mainly reset and power management). > You cannot use only one gpio either (e.g. only reset gpio but not the > interrupt gpio), you need both for this functionality to work. > > If the hardware does not support using the interrupt gpio pin as output, > it should not declare the named int-gpio pin in ACPI. It is true that > we might later run into platforms that declare the int-gpio pin even if it > does not actually work (just like we now have the indexed gpio pins). > I could have added an additional property for this as you first suggested, > but if we can modify the ACPI to add it, we could simply remove the > named interrupt pin instead (that does not work anyway). Ok, got it. Thanks, Arnd -- 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
