On 01.03.21 15:51, Linus Walleij wrote: Hi,
I don't know what the idea is with this but register are not normally defined in the DTS files. The registers are determined from the compatible value.
The idea is basically replacing the pdata struct by oftree node. (subsequent patches in this queue use this by doing the board setup via compiled-in dtb, instead of the currently hardcoded tables). On these SoCs, the gpio setup is a little bit more complex than just having a fixed range of registers (one per pin): the actual meaning depends und Soc model and board type - some regs aren't even gpios. (I'm still in progress of RE'ing the bios blob, to find out more, eg. pinmux setups, etc). Writing to the wrong regs can cause weird effects (actually not even sure whether it could lead to damage) In essence: only a specific subset of the register range can be used for GPIOs - the others shouldn't ever be touched. And this specific subset is soc/board specific. --mtx -- --- Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren GPG/PGP-Schlüssel zu. --- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@xxxxxxxxx -- +49-151-27565287
