mvsdio not working on OpenRD

Hi,

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

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

                        pmx_uart1: pmx-uart1 {
                                marvell,pins = "mpp13", "mpp14";
                                marvell,function = "uart1";
                        };

and

                        pmx_sdio: pmx-sdio {
                                marvell,pins = "mpp12", "mpp13", "mpp14",
                                               "mpp15", "mpp16", "mpp17";
                                marvell,function = "sdio";
			};

Either you can have MMC, or you can have the RS-232/RS485 on a DB9 or
you can have MMC. You cannot have both.

It seems like older Debian kernels has defaulted to MMC, so we should
probably disable the serial port.

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

Please can you try the following patch. If this works, i can add it to
mainline. The issue we might run into is that somebody else wants
serial not MMC....

I use mainline kernel only, and I also think the default should be SD
like it used to be with legacy boot...

A.