Messages in this thread | | | From | Jagan Teki <> | Date | Thu, 6 Dec 2018 01:26:42 +0530 | Subject | Re: [PATCH 5/9] dt-bindings: input: touchscreen: goodix: Document vcc-supply property |
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On Mon, Dec 3, 2018 at 4:11 PM Chen-Yu Tsai <wens@csie.org> wrote: > > On Mon, Dec 3, 2018 at 6:16 PM Jagan Teki <jagan@amarulasolutions.com> wrote: > > > > vcc-supply property is need for some Goodix CTP controller like GT5663 > > where 3.3V external pull-up regulator connected via controller VCC pin. > > "External pull-up regulator" sounds fishy. Chips have power supply > pins, either combined, or separate rails for analog, digital, and I/O. > For Goodix chips these are AVDD28, AVDD22, DVDD12, amd VDDIO. The name > and description you provide match none of these.
We have vcc pin in the connector to supply vcc-ctp, but indeed it is AVDD28 supply as per the reference schematic design[1] Page 23. Host interface has AVDD pin which is connected to ADVDD28 on goodix chip, so I can name this as avdd28-supply. is that OK?
[1] https://www.crystalfontz.com/controllers/GOODIX/GT5663/459/
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