[OpenWrt-Devel] Broken GPIO on MT7620 after commit 34ca34b32b02

Andrey Jr. Melnikov temnota.am at gmail.com
Wed May 23 07:09:43 EDT 2018

In gmane.comp.embedded.lede.devel Rosen Penev <rosenp at gmail.com> wrote:
> On Tue, May 22, 2018 at 7:45 AM, Kristian Evensen
> <kristian.evensen at gmail.com> wrote:
> > Hi,
> >
> > On Tue, May 22, 2018 at 4:33 PM, John Crispin <john at phrozen.org> wrote:
> >> what exactly is the issue ? breaking compat means that rosen either needs to
> >> fix the regression or we need to revert the patch.
> >
> > The issue I saw is that writing to GPIO has no effect. On my device
> > (mt7620-based), I can control the power to the two mini-pcie slots by
> > writing to /sys/class/gpio/power_pcie{1,2}/value. After the commit
> > "ramips: mmc: Sync with
> > staging driver", writing to these two files have no effect. I.e., I
> > can no longer control the power.
> Looks like it's this commit:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/staging/mt7621-mmc?h=next-20180517&id=b734735fcaca60e8f07b040cd8a700f6fabe5b39

> Please try reverting. Unfortunately I don't have mt7620 hardware so I
> can't test. Based on the comment, the issue should be fixed elsewhere.
This commit removed programming SDXC_MODE register to GPIO mode and nothing
So - fix your device dts, add nd_sd to gpio group.

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