On Fri, Jul 21, 2023 at 5:41 AM Francesco Dolcini <francesco@xxxxxxxxxx> wrote: > > On Fri, Jul 21, 2023 at 05:05:51AM -0600, James Hilliard wrote: > > On Fri, Jul 21, 2023 at 4:43 AM Krzysztof Kozlowski > > <krzysztof.kozlowski@xxxxxxxxxx> wrote: > > > On 21/07/2023 12:33, James Hilliard wrote: > > > > + compatible = "regulator-fixed"; > > > > + regulator-name = "touch_3v3_supply"; > > > > + regulator-always-on; > > > > > > Also, missing constraints. > > > > Hmm, what's the correct way to determine the constraint values? > > You should know/understand the hardware design. Normally when writing a > DT file you have the hardware schematics and the relevant datasheets > available. I did find some datasheets/schematics, but I'm having trouble finding something which indicates it would be anything other than 3.3v there(although I don't read a lot of schematics in general so I might be missing something obvious): https://www.variscite.com/wp-content/uploads/2017/12/VAR-SOM-MX6_v1-Datasheet.pdf https://www.variscite.com/wp-content/uploads/2017/12/VAR-SOM-MX6_datasheet.pdf https://www.variscite.com/wp-content/uploads/2017/12/VAR-MX6CustomBoard-Schematics-for-VAR-SOM-MX6_V1.pdf https://www.variscite.com/wp-content/uploads/2017/12/V2_VAR-MX6CustomBoard-Schematics.pdf https://www.variscite.com/wp-content/uploads/2017/12/VAR-MX6CustomBoard-Datasheet.pdf > > > I'm guessing they should just be set to this based on the name?: > > regulator-min-microvolt = <3300000>; > > regulator-max-microvolt = <3300000>; > > This looks like a good guess, assuming that the regulator name is > correct. Tested with that but it didn't work, screen failed so I guess must be something different? > > Francesco >
