From mboxrd@z Thu Jan 1 00:00:00 1970 From: tremyfr@yahoo.fr (trem) Date: Mon, 12 Nov 2012 21:17:42 +0100 Subject: usb clock not found on imx27 when using dt In-Reply-To: <20121112075411.GO10369@pengutronix.de> References: <1352666074.32152.YahooMailNeo@web28806.mail.ir2.yahoo.com> <20121112075411.GO10369@pengutronix.de> Message-ID: <50A15966.8040204@yahoo.fr> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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). Regards, Philippe -------------- next part -------------- A non-text attachment was scrubbed... Name: usb_imx27_dt.tar.bz2 Type: application/x-bzip Size: 24021 bytes Desc: not available URL: