Status of drivers/of/configfs.c

Status of drivers/of/configfs.c

[John Carter]

In 2014 Pantelis Antoniou sent a patch...
    https://lkml.org/lkml/2014/3/18/625
...creating an interface between the config filesystem and devicetree overlays.

As far as I can see it is used in a couple of "off the mainstream
kernel" like the beaglebone black.

Alas, at this stage it doesn't seem to have made it into the upstream
kernel.....

1) What is the status of this patch? Is it still being maintained? If so where?

2) My interest in it is for an nasty bit of oddball hardware.

I have to change a pin from being an gpio input at boot time to being
a uart output sometime after boot.

Would the of / configfs be the best way of doing that or is there a better way?

Thank you!

-- 
John Carter
Phone : (64)(3) 358 6639
Tait Electronics
PO Box 1645 Christchurch
New Zealand

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Re: Status of drivers/of/configfs.c

[Robert Nelson]

Hi John,

On Tue, Aug 29, 2017 at 5:37 PM, John Carter <john.carter-U313QQUz4dygSpxsJD1C4w@public.gmane.org> wrote:
> In 2014 Pantelis Antoniou sent a patch...
>     https://lkml.org/lkml/2014/3/18/625
> ...creating an interface between the config filesystem and devicetree overlays.
>
> As far as I can see it is used in a couple of "off the mainstream
> kernel" like the beaglebone black.
>
> Alas, at this stage it doesn't seem to have made it into the upstream
> kernel.....
>
> 1) What is the status of this patch? Is it still being maintained? If so where?
>
> 2) My interest in it is for an nasty bit of oddball hardware.
>
> I have to change a pin from being an gpio input at boot time to being
> a uart output sometime after boot.
>
> Would the of / configfs be the best way of doing that or is there a better way?

I think most of us have given up on making it work in the kernel, just
too many race conditions.

I'd say for the last half year we (beagleboard) have been focusing on
moving to u-boot overlays.  Just less issues when you have the
device-tree-binary setup in a proper state at kernel boot.

Regards,

-- 
Robert Nelson
https://rcn-ee.com/
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