Messages in this thread | | | Date | Mon, 16 Dec 2013 15:05:14 +0000 | From | Lee Jones <> | Subject | Re: Simple MFD driver example |
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Please refrain from top posting.
Responses should appear under quoted lines, which they reference.
> >> I have been trying to write about 50-100 LOC for 1-2 weeks now. I have > >> a fairly simple use case for MFD where I need to have gpio and hwmon > >> functionality for a GPIO. > >> > >> I read the mfd drivers inside and out by now, but it looks a bit > >> inconsistent to me. I am not sure what to follow etc. The > >> documentation seems to be virtually missing which makes my life and > >> involvement even more difficult. :( > >> > >> May I ask for some pointer how to do all this? It would be nice to see > >> a minimal example where the parent does not do anything else than just > >> enumerating the sub-device drivers. Is that possible with an empty > >> probe callback? > >> > >> If I understand the regmap correctly (again, it is possible I do not), > >> then I would not need this. But in general, it is really hard to deal > >> with the linux kernel in this regard when basic documentations are > >> missing. > >> > >> I hope this would change over time for the posterity. It is a pity > >> that contributors do not join probably due to this. It is a bit > >> chaotic, but I hope it can be changed in the future. > >> > >> Apologies for my frustration... > > > > Due to the nature of the MFD subsystem, there isn't a simple use-case > > which you can use as a template. It's completely dependent on the > > device you are trying to enable. There are lots of well written > > drivers in the subsystem that you can use as good examples though.
> Well, if you ask me the MFD subsystem is underdocumented, and there is > some inconsistency between the drivers. It is hard to take any of them > as a starting point, at least for me.
Feel free to write some. I'm always happy to take helpful patches.
> Currently, I wrote a simple one from scratch which I will post soon.
Okay great.
-- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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