On Wed, Mar 11, 2015 at 03:52:53PM +0100, Bas Vermeulen wrote:
> Hello,
>
> On Wed, March 11, 2015 2:51 pm, Sascha Hauer wrote:
> > This driver normally is not used with device tree. Without additional
> > kernel changes the chipidea driver is used instead.
>
> I'm just forward-porting a patch I made for 2.6.31.14 to workaround
> an issue we found. I'm unsure where to fit this in in the chipidea driver.
>
> However, if you read the errata for the i.mx35, you will see the problem
> and the fix proposed. I have been unable to find that errata for other
> soc's in the family (but some google fu found somewhat similar issues for
> i.mx25 and i.mx51).
>
> I would still like to get this patch incorporated into the ehci-mxc
> driver, as it might make it easier to find for people with the same
> problem.
If you start your board with device tree the ehci-mxc driver will never
be started, because noone ever registers the device. When you start
without device tree (but instead with board file)
of_machine_is_compatible("fsl,imx35") will always return false because
there is no device tree. To trigger your fixup one would have to start
the kernel via device tree and additionally create a board file which
registers the ehci-mxc device. A rather unusual case.
Sascha
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