mvsdio not working on OpenRD

Hi,

On Fri, Jan 15, 2016 at 11:22:17AM -0800, Martin Michlmayr wrote:

* Aaro Koskinen [off-list ref] [2016-01-15 20:03]:

quoted

On Sun, Jan 10, 2016 at 04:38:43PM +0100, Andrew Lunn wrote:

quoted

If i remember correctly, the OpenRD has some odd muxing going on with
MMC and the second serial port. This fits the error message:

Andrew, your memory is good!  I looked at the old board file and
noticed there used to be a kw_openrd_init_uart1 kernel option to
choose.  The default was MMC (this was not a Debian choice, but one
from kernel.org), so I think that should become the default again.

See https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/diff/arch/arm/mach-kirkwood/openrd-setup.c?id=ba364fc752daeded072a5ef31e43b84cb1f9e5fd

Rick Thomas did some tests we came to the conclusion that MMC on DTB
doesn't work, even with your patch.  We established that the same
kernel (3.16) works with the board file but not with DTB.  I was about
to send an udpate when I saw Aaro's email.

I suggested we put in both of these patches.  I'll produce a test
kernel for Rick with Aaro's patch.

quoted

In addition, the UART/SD selection GPIO needs to be set up. I sent a
patch proposal for this:
	http://marc.info/?l=linux-arm-kernel&m=145262936504783&w=2

Thanks!

BTW, the GPIO hogging binding used in the patch might not be supported
by the old Debian 3.16 kernel. :-(

One workaround would be to setup the GPIO from userspace using sysfs,
but that would need replug of the SD card (unbind/bind, or if the driver
a module unload/reload, might work), but that's quite clumsy...

A.