On Mon, 6 Dec 2021 at 12:16, Geert Uytterhoeven [off-list ref] wrote:

quoted

quoted

+       depends on OF && LITEX

I don't like having litex drivers depend on the LITEX kconfig. The
symbol is not user visible, and to enable it we need to build in the
litex controller driver, which platforms may or may not have.

The microwatt platform is an example of a SoC that embeds some LITEX
IP, but may or may not be a litex SoC.

I do like the LITEX dependency, as it allows us to gate off a bunch of
related drivers, and avoid annoying users with questions about them,
using a single symbol.

I appreciate your concern.

We could do this:

        depends on PPC_MICROWATT || LITEX || COMPILE_TEST

It's unfortunate that kconfig doesn't let us describe the difference
between "this driver requires this symbol" as it won't build and "this
driver is only useful when this symbol is enabled". Traditionally I
write kconfig to represent only the former, whereas you prefer both.

Originally, people told me the system controller is always present,
hence the current logic to have LITEX_SOC_CONTROLLER visible, and
an invisible LITEX (which is shorter to type) for individual drivers
to depend on.

That's another option. I think LITEX either needs to become visible,
become selected by microwatt, or we adopt the proposal I made above
for the litex drivers that the microwatt soc uses.