Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding | Date | Mon, 15 Dec 2014 22:57:36 +0100 |
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On Monday 15 December 2014 13:35:47 Ray Jui wrote: > > Like I said previously, dynamic GPIO allocation works fine in the > kernel, as long as all of our GPIO clients in the kernel use gpiod based > API, which is what we will enforce going forward. The only problem is > with some of our customers who use GPIO through sysfs and expect fixed > global GPIO numbers. Thinking about this more, it's probably not that > difficult to add a script for those customers to convert/map the GPIO > numbers based on readings parsed from sysfs, so I guess that's fine. >
I think we discussed the user space interface a number of times in the past, but I forgot the outcome. Either there is already a way to name gpio lines uniquely in sysfs, or there should be one.
Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?
Arnd
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