imx6dl/imx6q fec rmii mode with external ref_clk

[Philippe De Muyter]

Hi Shawn,

On Wed, Jan 15, 2014 at 03:35:40PM +0800, Shawn Guo wrote:
> On Tue, Jan 14, 2014 at 04:30:12PM +0100, Philippe De Muyter wrote:
> > Hi,
> > 
> > On the custom board we are developping (imx6q and imx6dl), we have connected
> > the fec to a switch chip using rmii mode, and we let the switch provide the
> > reference clock to gpio_16.
> > 
> > I work currently with 3.13-rc8 and
> > 
> > - I do not have ethernet access working (tx timeout)
> > - I do not find in the dtb files a description of the pad settings for the
> > RMII mode
> > - when searching about the setting for bit 21 ing GPR1, which seems to
> > be important for my setting to work, I found the following mail:
> > 	http://www.spinics.net/lists/devicetree/msg06450.html
> 
> Just for testing your hardware, does the following change make the
> Ethernet work for you?
> 
> Shawn
> 
> diff --git a/arch/arm/mach-imx/mach-imx6q.c
> b/arch/arm/mach-imx/mach-imx6q.c
> index e51e3da..be8d074 100644
> --- a/arch/arm/mach-imx/mach-imx6q.c
> +++ b/arch/arm/mach-imx/mach-imx6q.c
> @@ -188,7 +188,7 @@ static void __init imx6q_1588_init(void)
>         if (!IS_ERR(gpr))
>                 regmap_update_bits(gpr, IOMUXC_GPR1,
>                                 IMX6Q_GPR1_ENET_CLK_SEL_MASK,
> -                               IMX6Q_GPR1_ENET_CLK_SEL_ANATOP);
> +                               0);
>         else
>                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
> 

Yes, it works now.  Thanks.  Is that configurable from the device tree ?

Philippe