Hi Jani Am 07.04.22 um 10:45 schrieb Jani Nikula: ...
I think another idea that could work is to use an intermediate symbol. For DP, drivers would select the tristate DP_HELPER, which in turn selects tristate DISPLAY_HELPER and boolean DISPLAY_DP_HELPER. But this would require a 'useless' symbol DP_HELPER only for convenience. It's an even less optimal solution, it seems.Documentation/kbuild/kconfig-language.rst: Note: select should be used with care. select will force a symbol to a value without visiting the dependencies. By abusing select you are able to select a symbol FOO even if FOO depends on BAR that is not set. --> In general use select only for non-visible symbols --> (no prompts anywhere) and for symbols with no dependencies. That will limit the usefulness but on the other hand avoid the illegal configurations all over. Most of the difficult Kconfig issues I've encountered over the years come from not following the above two rules. People break those rules for "convenience", causing a lot of inconvenience down the line.
I have meanwhile updated the patchset and all new boolean options are internal. No select will be performed on 'visible' symbols. So it should be fine.
Best regards Thomas
BR, Jani.Best regards Thomas-- Best regards, Javier Martinez Canillas Linux Engineering Red Hat
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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