On Wed, March 11, 2015 4:01 pm, Sascha Hauer wrote:
> 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.
What should I use instead? I'm fine changing the patch, I'm just not sure
what to use to make it conditional.
Bas Vermeulen
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