On 18:17-20231003, Ayush Singh wrote:
- reset-gpios:
- maxItems: 1
- power-gpios:
- maxItems: 3
- description:
The device has three power rails that are exposed on external pins VDDS,VDDR and DCOUPL.Shouldn't these be regulators? The power rails are input to the MCU, correct? The properties should be something like: vdds-supply vddr-supply dcoupl-supply ? (not sure what dcoupl is, but description should provide that info).
the gpio controls for those can be modelled by regulator-gpio ?
I picked up power lines from "CC13xx/CC26xx Hardware Configuration and PCB Design Considerations Application Report" present under "8.14 Network Processor" of CC1352P7 data sheet.
But now looking closer, it doesn't seem like DCOUPL can be supplied externally for CC1352P7 and thus should probably be removed.
Also, it seems like for CC1352P7, VDDR must always be supplied internally (The data sheet states: "Internal supply, must be powered from the internal DC/DC converter or the internal LDO"). Thus, it should be safe to remove VDDR as well.
From Figure 3-1. CC1312R 7x7 RF Part Schematic Overview (app report you point out below) Typical usage is vdds-supply supplying: VDDS (pin 44) VDDS2 (pin 13) VDDS3 (pin 22) VDDS_DCDC (pin 34)
And DCDC_SW (pin 33) supplies vddr supplying: VDDR(pin 45) VDDR_RF (Pin 48)
That means only VDDS needs to be present for power line.
I agree that that would be the typical supply model. So, just vdds-supply
CC13xx/CC26xx Hardware Configuration and PCB Design Considerations Application Report: https://www.ti.com/lit/pdf/swra640
CC1352P7 Data sheet: https://www.ti.com/lit/gpn/CC1352P7