On 08/10/2024 08:56, markus.stockhausen@xxxxxx wrote: >> >>> E.g. st,invert-ext. Something like this will be needed in the future >>> because the SerDes allow to swap polarity which must be changed >>> depending on the switch design. How to do this? >> >> I do not understand the hardware aspect discussed in the property description... probably because there is no hardware description at all, but instead you speak about driver. >> >> I do not understand how polarity has anything to do with U-Boot configuring serdes. > > Maybe my lack of knowledge in platform driver programming or the naming > conventions leads to confusion. I'm searching for knobs to control the behaviour > of the SerDes depending on the hardware. Two examples are (more may come): > > - "ignore SerDes X": because the provided patch sequence confuses the SerDes > and overwrites registers with wrong values that vendor patched U-Boot has setup > correctly before. And if someone updates the bootloader to a bit different one, the DTS becomes wrong? How do you handle then same board with two different bootloaders requiring two different DTS? DTS is software-independent description of the hardware, so this does not look like DTS property. > > - "reverse polarity of SerDes X": same goes here. Some boards need inverted > signalling on some of the SerDes to work properly. This must be configurable > somehow. I do not see how this is related to "control ports" property. There are few bindings which already do this, so look at them. Best regards, Krzysztof
