On Thu, Jan 19, 2017 at 9:08 AM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > On 19/01/17 17:03, Rob Herring wrote: > >>>> According to the datasheet, SSD1307 has 2 supplies: Vdd and Vcc >>>> >>>> I don't see any mention of a charge pump, so that must be an external >>>> component. >>> >>> VBAT is for SSD1306. Perhaps the DT doc should mention it. >> >> Datasheet says VBAT is reserved, connect to Vdd. I would just describe >> Vdd and Vcc in that case. > > I'm no HW guy, but as far as I understand, you can wire it up two ways. > One has VBAT connected to VDD. The other one has VBAT connected to > external supply. See "Figure 1 : Application Example of SSD1306Z with > charge bump". I should have kept reading... So either Vdd and Vbat supplies or Vdd and Vcc supplies are valid and the former only applies to 1306. Rob -- 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
