linux-kernel - Re: [PATCH v3] ARM: zynq: DT: Add USB to device tree

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Date:	Mon, 26 Jan 2015 10:35:18 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	monstr@...str.eu, Michal Simek <michal.simek@...inx.com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
CC:	devicetree@...r.kernel.org,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Ola Jeppson <ola@...pteva.com>
Subject: Re: [PATCH v3] ARM: zynq: DT: Add USB to device tree

Am 26.01.2015 um 09:33 schrieb Andreas Färber:
> Am 26.01.2015 um 09:23 schrieb Michal Simek:
>> On 01/26/2015 09:19 AM, Andreas Färber wrote:
>>> And if I apply it to my -next based tree, adding corresponding nodes to
>>> zynq-parallella.dts, I get repeatedly:
>>>
>>> [  +0,012242] ci_hdrc ci_hdrc.0: no of_node; not parsing pinctrl DT
>>> [  +0,000157] ci_hdrc ci_hdrc.0: ChipIdea HDRC found, lpm: 0; cap:
>>> f090e100 op: f090e140
>>> [  +0,000081] platform ci_hdrc.0: Driver ci_hdrc requests probe deferral
>>> [  +0,005360] ci_hdrc ci_hdrc.1: no of_node; not parsing pinctrl DT
>>> [  +0,000120] ci_hdrc ci_hdrc.1: ChipIdea HDRC found, lpm: 0; cap:
>>> f0910100 op: f0910140
>>> [  +0,001810] platform ci_hdrc.1: Driver ci_hdrc requests probe deferral
>>>
>>> Am I missing any other patches or config options?
>>> (I do notice that the pinctrl v3 patch that got merged has a trivial bug
>>> for usb0, for which I'll send a patch later on.)
>>
>> Why is it deferred? Is it because of pinmuxing stuff?
> 
> No, happened without as well.
> 
> Looking at a different place in dmesg, I spot this:
> 
> [  +0,003988] usb_phy_generic phy0: GPIO lookup for consumer reset-gpios
> [  +0,000012] usb_phy_generic phy0: using device tree for GPIO lookup
> [  +0,000015] of_get_named_gpiod_flags: can't parse 'reset-gpios-gpios'
> property
>  of node '/phy0[0]'
> [  +0,000013] of_get_named_gpiod_flags: can't parse 'reset-gpios-gpio'
> property
> of node '/phy0[0]'
> [  +0,000010] usb_phy_generic phy0: using lookup tables for GPIO lookup
> [  +0,000153] usb_phy_generic phy0: lookup for GPIO reset-gpios failed
> [  +0,000012] usb_phy_generic phy0: Error requesting RESET GPIO
> [  +0,004360] usb_phy_generic: probe of phy0 failed with error -2
> [  +0,004991] usb_phy_generic phy1: GPIO lookup for consumer reset-gpios
> [  +0,000012] usb_phy_generic phy1: using device tree for GPIO lookup
> [  +0,000013] of_get_named_gpiod_flags: can't parse 'reset-gpios-gpios'
> property
>  of node '/phy1[0]'
> [  +0,000013] of_get_named_gpiod_flags: can't parse 'reset-gpios-gpio'
> property of node '/phy1[0]'
> [  +0,000010] usb_phy_generic phy1: using lookup tables for GPIO lookup
> [  +0,000012] usb_phy_generic phy1: lookup for GPIO reset-gpios failed
> [  +0,000011] usb_phy_generic phy1: Error requesting RESET GPIO
> [  +0,004337] usb_phy_generic: probe of phy1 failed with error -2
> 
> So, I guess the chipidea driver is deferring because the phys want a
> property that neither me nor you are specifying? Would that be the two
> MDIO pins 52 and 53 that would need to be specified?

Erm, scratch that last question - wrong PHY. Trying it resolved the
above phy errors but not the original problem. And so does an empty one:

@@ -99,11 +100,13 @@

        usb_phy0: phy0 {
                compatible = "usb-nop-xceiv";
+               reset-gpios = <>;
                #phy-cells = <0>;
        };

        usb_phy1: phy1 {
                compatible = "usb-nop-xceiv";
+               reset-gpios = <>;
                #phy-cells = <0>;
        };
 };

In my manuals and notes I can't find any GPIO being used as reset for
the USB PHYs. Any thoughts appreciated.

Regards,
Andreas

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