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

Kristian Evensen kristian.evensen at gmail.com
Wed May 23 09:12:03 EDT 2018

On Wed, May 23, 2018 at 4:09 AM, Andrey Jr. Melnikov
<temnota.am at gmail.com> wrote:
> 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
> more.
> So - fix your device dts, add nd_sd to gpio group.

nd_sd is already part of the gpio group, so then I guess the change
linked to by Rosen is not relevant in my case.


openwrt-devel mailing list
openwrt-devel at lists.openwrt.org

More information about the openwrt-devel mailing list