Support for Linkstation Pro Duo V3

[Vesa Saastamoinen]

Hi,

I got old Linkstation and HW version seems to be different than lswtgl.
Model is Buffalo Linkstation Pro Duo V3. Buffalo itself do not separate
those models, but this sw version starts with number 3.xx and normal
model is 1.xx. V3 has two usb connectors on back side.

Support for this models needs new devicetree and I have done it somehow
ready. Only issue is that marvell 88f5182-pincontrol driver is broken
for gpiopins 20-25. Some of v3 functions use those pins. 19-25 pins are
readable for input, but driver refuses direction control. By datasheets
20-25 pins has different way to control directions. This is explained on
ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7800-linux/docs/MV88F5182-opensource-manual.pdf
page 387. Now most critical issue is that second usb power control is
not working and back side slide switch is not readable on "auto"
position. The switch use gpio22. USB port 2 power function I have not
able to locate yet due driver issues. I can not get pins 20-25 to output
mode..

But most of needed functions are below 20, so I have partially working
dts file for lswtgl v3. What is prober way to deliver this on Debian? I
would like to get this v3 model also supported directly, now I have to
import devicetree manually after kernel update.

Original lswtgl dts has some typos, one critical is on regulator
control. Typo affects to hdd and usb powers. Hdd power is luckily
correct by uboot, but usb power stays dead. There is "gpios" in place
where correct is "gpio". Same bug at least on kuro.

So how to preceed? Partial working devicetree file needs probably diff,
but against what? How to get gpio-driver fixed for 20-25 pins?

Yep, I know, this device is rare. To get it up and running, it needed
full re-capping the power supply. So there is no probably many working
sisters for this device. But it runs OpenMediaVault 4.1 with ~20MB/s
trasfer speeds!

[Paul Wise]

Post by Vesa Saastamoinen
So how to preceed? Partial working devicetree file needs probably diff,
but against what? How to get gpio-driver fixed for 20-25 pins?

If your boot firmware doesn't already pass the right devicetree file
to the Linux kernel, the other main store of devicetree files is
currently in the Linux kernel source tree. So the right way to proceed
with that part would be to submit the file (and fixes for lswtgl/kuro
dts) for inclusion in the Linux kernel. Once the changes have been
accepted, then you can file a bug against the Debian linux source
package to backport the patches to our versions of the Linux kernel.

http://kernelnewbies.org/
http://kernel.org/