[PATCH v2] gpio: search gpio-line-names property in dm_gpio_lookup_name

[Tom Rini]

On Thu, Oct 16, 2025 at 11:23:55AM +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>
> ---
> 
> v2: guard the the dev_read_stringlist_search() call by
> CONFIG_IS_ENABLED(OF_CONTROL) to avoid link failure on !OF_CONTROL
> platforms.

Frustratingly this is still a failure to build for imx28_btt3 and
imx28_xea, in SPL.

-- 
Tom
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