usb clock not found on imx27 when using dt

[Marek Vasut]

Dear trem,

> On 12/11/12 08:54, s.hauer at pengutronix.de wrote:
> > On Sun, Nov 11, 2012 at 08:34:34PM +0000, Philippe Reynes wrote:
> >> Hi all,
> >> 
> >> I try to add the support of usb on my armadeus apf27,
> >> but there is a problem when try to reclaim the clock.
> >> imx_usb mxc-ehci.0: Failed to get clock, err=-2
> >> 
> >> To avoid adding too many attachment to this mail,
> >> I've put all the information on a website. You can
> >> found them here:  http://ryu.zarb.org/~trem/armadeus/
> >> 
> >> 
> >> The initial issue is in the directory : 20121110
> >> 
> >> boot-3.7-rc4.log : boot log with the issue
> >> linux-3.7-rc4.config : the configuration file for the kernel
> >> investifation.txt : the description of my investigation.
> > 
> > You should really post the relevant bits on the mailing list. Nobody
> > visits websites for investigating your issue. Besides, it will not be
> > in the mailing list archives so people will not find it later.
> 
> You're right, I add an archive with all log as attachment.
> 
> >> I've tried to fix the clock issue, but another issue occurs.
> >> The information about this "fix" is in : 20121111
> >> boot-3.7-rc4.log : boot log with the new issue
> >> issue.txt : the description of the change done on the kernel
> >> 
> >> I've got severals questions :
> >> - does my dts correct with usb change ?
> >> - does someone has already tested usb on imx27 with dt ?
> > 
> > Please investigate in using the chipidea driver. This will be the way
> > forward for i.MX.
> 
> I use the chipidea driver for the usb.
> 
> The main issue is that the chipidea driver don't found the clock :
> 
> [    0.761693] imx_usb mxc-ehci.0: Failed to get clock, err=-2
> [    0.767620] imx_usb: probe of mxc-ehci.0 failed with error -2
> 
> The driver ci13xxx_imx request the clock in the probe function
> in the following line:
> data->clk = devm_clk_get(&pdev->dev, NULL);
> calling: clk = clk_get(dev, id);
> calling: clk_get_sys(dev_id, con_id);
> calling: clk_find(dev_id, con_id);
> with dev_id = mxc-ehci.0 and con_id = NULL
> This last function fail to found a clock.
> 
> In the function mx27_clocks_init, several mxc-ehci.0
> clocks are registered, but all with a con_id.
> 
> So the function clk_find fails.
> 
> As I'm not really sure of the dts, I don't know if the problem
> is in the dts or in the driver (maybe both).

Please pull the relevant parts from the attachment and post them inline.

Best regards,
Marek Vasut