Hi Alexandre,

On Sat, Mar 13, 2021 at 10:28 AM Alexandre Belloni
[off-list ref] wrote:

On 12/03/2021 14:57:54+0100, Enrico Weigelt, metux IT consult wrote:

quoted

On 02.03.21 06:30, Drew Fustini wrote:

quoted

Add "pinmux-select" to debugfs which will activate a pin function for a
given pin group:

   echo "<group-name function-name>" > pinmux-select

The write operation pinmux_select() handles this by checking that the
names map to valid selectors and then calling ops->set_mux().

I've already been playing with similar idea, but for external muxes.
For example, some boards have multiple SIM slots that can be switched
via some gpio pin.

Not sure whether traditional pinmux would be a good match for that.

If you want to be able to use both, then I guess gpio-mux is what you
are looking for. Obviously, it will also require support in the bus
core. On what bus are those SIMs? (I guess the answer will be UART and
then unfortunately UARTs are not represented as busses).

We do have support for devices connected to UARTs.
See patternProperties in Documentation/devicetree/bindings/serial/serial.yaml.
Or do you mean something different?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds