[PATCH v2] ARM: bcm2835: Add names for the Raspberry Pi GPIO lines

Gottfried Haider [off-list ref] writes:

Hi Eric, Linus,

I'll hopefully find time to look at the more recent changes to the gpio
subsystem (lsgpio?!), but since this patch is up for discussion now - what
I was wondering: how does this change relate to /sys/class/gpio/gpio%d? Is
this completely orthogonal - or would this change the sysfs interface as
well?

Regarding the proposed format using the header pin numbers: From what I've
seen in terms of existing educational materials, it seems the overwhelming
majority ends up using GPIO numbers instead of physical pin header
numbering. (e.g. [1] [2])
Would it be too confusing to try to pick GPIO 5 from an alphabetically
sorted list like this "P11_GPIO17", "P12_GPIO18"? (I know, alphabetical
sorting is an issue here already for a different reason. But applications
might do it, I guess?)

I added the pin numbers because it was a consistent response to the
first version.  I do think the GPIO numbers without pin numbers would be
the most clear.
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