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SubjectRe: [EXT] Re: [PATCH 1/2 v4] dt-bindings: dspi: added for semtech sx1301
Am 2022-04-21 16:23, schrieb Rob Herring:

> What's needed here is a connector node (and driver) for the mikrobus
> socket. The connector node's purpose is to decouple the host DT from
> add-on board overlay DT. Something like this:

Funny I had a similar idea to have a connector with all the
properties, but I failed to see how that would be of any help.

Do you mind an example of such an overlay? Judging by the spi
and i2c subnode, I guess it will amend the connector node and
fill in it's devices?

And all the child device properties will reference the connector,
correct?

> connector {
> // And a more specific compatible if pins can have alt funcs?
> // Spec version needed?
> compatible = "mikrobus-socket";
>
> // Will need regulators defined if child devices expect
> // regulators
> vcc-33-supply = <&reg33>;
> vcc-5-supply = <&reg5v>;
>
> i2c-parent = <&i2c1>; // Already a defined property
> spi-parent = <&spi0>; // New

uart/serial needed too?

>
> // RST pin
> reset-gpios = <&gpio 4 0>;
>
> // remap 'INT' (index 0) to host interrupt
> #interrupt-cells = <2>;
> #address-cells = <0>;
> interrupt-map = <0 0 &gpio 3 0>;
>
> spi {

For example:

my-device@0 {
reg = <0>; // really needed? there is only one SPI CS line
compatible = "my-device";
reset-gpios = // may be left unset if it's optional, but what
// what if it is a required property and in hardware
// its connected to the RST pin of the module?
other-gpios = <&connector 2>;
vdd-supply = // what comes here? <&connector VCC_33>?
interrupts-extended = <&connector 0 ..>;
}

-michael

> //devices
> };
>
> i2c {
>
> };
> };
>
> The DT spec defines 'foo-map' properties extending interrupt-map.
> Currently only GPIO is defined. We might want to do the same thing for
> PWM. Or we make the connector node both a PWM consumer and provider.
>
> Rob

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