Messages in this thread | | | Subject | Re: [PATCH v9 2/4] pinctrl: pinmux: Add pinmux-select debugfs file | From | "Enrico Weigelt, metux IT consult" <> | Date | Thu, 18 Mar 2021 20:40:42 +0100 |
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On 13.03.21 19:47, Geert Uytterhoeven wrote:
>>> 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?
in my case, the SIM cards are connected directly to the baseband (there're extra lines on the m2 slots for that). CPU doesn't ever see any of this traffic, just can select which SIM card is routed to the m2 slot via gpio.
--mtx
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