[PATCH] gpio: search gpio-line-names property in dm_gpio_lookup_name

[Tom Rini]

On Tue, Oct 07, 2025 at 12:26:37PM +0200, Rasmus Villemoes wrote:

> In scripts as well as interactively, it's much nicer to be able to
> refer to GPIOs via their names defined in the device tree property
> "gpio-line-names", instead of the rather opaque names derived from the
> bank name with a _xx suffix. E.g.
> 
>   gpio read factory_reset FACTORY_RESET
>   if test $factory_reset = 1 ; then ...
> 
> versus
> 
>   gpio read factory_reset gpio at 481ac000_16
>   if test $factory_reset = 1 ; then ...
> 
> This is also consistent with the move on the linux/userspace side towards
> using line names instead of legacy chip+offset or the even more legacy
> global gpio numbering in sysfs.
> 
> As this seems to only add about ~50 bytes of code to U-Boot proper,
> and dm_gpio_lookup_name() most often ends up being GC'ed for SPL, so
> adds no overhead there, adding yet another config knob (or two, if it
> also needed an SPL variant) for this does not seem warranted.
> 
> Signed-off-by: Rasmus Villemoes <ravi at prevas.dk>

On a few platforms we now get a failure to build:
       arm:  +   work_92105
+(work_92105) arm-linux-gnueabi-ld: drivers/gpio/gpio-uclass.o: in function `dev_read_stringlist_search':
+(work_92105) include/dm/read.h:1078:(.text.dm_gpio_lookup_name+0x8c): undefined reference to `ofnode_stringlist_search'
+(work_92105) make[1]: *** [Makefile:2029: u-boot] Error 1
+(work_92105) make: *** [Makefile:198: sub-make] Error 2

-- 
Tom
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