On Tue, Jan 28, 2025 at 10:03 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > > On Tue, Jan 28, 2025 at 4:17 AM Yixun Lan <dlan@xxxxxxxxxx> wrote: > > > [Rob] > > > If Linux can't handle 1 node for N gpio_chip's, then that's a Linux > > > problem. Maybe it can, IDK. > > > > I haven't seen somthing like this to register 1 node for multi gpio_chips.. > > To gpio/pinctrl maintainer (Linus Walleij), do you have suggestion on this? > > For Linux we can call bgpio_init() three times and > devm_gpiochip_add_data() three times on the result and if we use the > approach with three cells (where the second is instance 0,1,2 and the > last one the offset 0..31) then it will work all just the same I guess? > > foo-gpios <&gpio 2 7 GPIO_ACTIVE_LOW>; > > for offset 7 on block 2 for example. > > We need a custom xlate function I suppose. > > It just has not been done that way before, everybody just did > 2-cell GPIOs. You can do either 3 cells or 2 cells splitting the 1st cell into <bank><index>. I'm pretty sure we have some cases of the latter. Rob
