Hi, On 23-02-03, Alexander Stein wrote: ... > > > > > > + vref-supply: > > > > > > + description: External ADC reference voltage supply on VREFH > > > > > > pad. > > > > > > > > > > Please add it to the list of required properties, we can remove it as > > > > > soon as the driver has support for the internal reference voltages. > > > > > > > > I was thinking in doing so before as well. But DT describes the > > > > hardware, and this ADC apparently would be functioning without a > > > > reference voltage on that pad, using a different one. What the driver > > > > actual does is a different matter.> > > > I have also thought about it first but than I checked the RM which says > > > that "multi-reference selection" is chip dependent. > > Nice for pointing this out. I wasn't aware that there are differences. > > > Oh goody. So is it detectable? > > That's my problem. I didn't find any source of information which chips do > support multiple references and which don't. > Marco, do you have some information on this? You can download the RM from the NXP website but you need an account for it: https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-8-applications-processors/i-mx-8-family-arm-cortex-a53-cortex-a72-virtualization-vision-3d-graphics-4k-video:i.MX8 Or is this the wrong model? The naming scheme is quite confusing to me. > > If we are going to stick to a single compatible rather than adding them for > > the variants with and without this feature, should probably add a note at > > least to say it is required for some parts. > > That's a good idea. I'm okay with that, until there is more information > available. According the RM there is a bit which can be read: Multi Vref Implemented (MVI). Regards, Marco
