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kconfig: Support conditional deps using "depends on X if Y"

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Extend the "depends on" syntax to support conditional dependencies
using "depends on X if Y". While functionally equivalent to "depends
on X || (Y == n)", "depends on X if Y" is much more readable and
makes the kconfig language uniform in supporting the "if <expr>"
suffix.
This also improves readability for "optional" dependencies, which
are the subset of conditional dependencies where X is Y.
Previously such optional dependencies had to be expressed as
the counterintuitive "depends on X || !X", now this can be
represented as "depends on X if X".

The change is implemented by converting the "X if Y" syntax into the
"X || (Y == n)" syntax during "depends on" token processing.

Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
[Graham Roff: Rewrote commit message, updated patch, added tests]
Signed-off-by: Graham Roff <grahamr@qti.qualcomm.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251215-kconfig_conditional_deps-v3-1-59519af0a5df@qti.qualcomm.com
[nathan: Minor adjustments to spacing]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Nicolas Pitre
2025-12-15 15:06:54 -08:00
committed by Nathan Chancellor
parent 5ce3218d4f
commit 76df6815da
12 changed files with 130 additions and 8 deletions
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2
scripts/kconfig/lkc.h
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@@ -82,7 +82,7 @@ void menu_warn(const struct menu *menu, const char *fmt, ...);
struct menu *menu_add_menu(void);
void menu_end_menu(void);
void menu_add_entry(struct symbol *sym, enum menu_type type);
void menu_add_dep(struct expr *dep);
void menu_add_dep(struct expr *dep, struct expr *cond);
void menu_add_visibility(struct expr *dep);
struct property *menu_add_prompt(enum prop_type type, const char *prompt,
struct expr *dep);