From: Felipe Balbi <balbi@ti.com>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: devicetree@vger.kernel.org, george.cherian@ti.com,
heikki.krogerus@linux.intel.com, linux-doc@vger.kernel.org,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
balbi@ti.com, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, rogerq@ti.com
Subject: Re: [PATCH 1/2] usb: dwc3: core: continue probing if usb phy library returns -ENODEV/-ENXIO
Date: Tue, 21 Jan 2014 08:47:25 -0600 [thread overview]
Message-ID: <20140121144725.GF30451@saruman.home> (raw)
In-Reply-To: <1390299099-14764-1-git-send-email-kishon@ti.com>
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On Tue, Jan 21, 2014 at 03:41:38PM +0530, Kishon Vijay Abraham I wrote:
> Since PHYs for dwc3 is optional (not all SoCs that have DWC3 use PHYs),
> do not return from probe if the USB PHY library returns -ENODEV as that
this isn't correct, they all have PHYs, some of them might not be
controllable.
> indicates the platform does not have PHY.
not really, that indicates the current platform tried to grab a PHY and
the PHY doesn't exist. If there's anybody with a non-controllable PHY
and someone gives me a really good reason for not using the generic
no-op PHY, then we should add a flag and we could:
if (!likely(dwc->flags & DWC3_USB2PHY_DRIVER_NOT_NEEDED))
dwc3_grab_phys(dwc);
But I really want to see the argument against using no-op. As far as I
could see, everybody needs a PHY driver one way or another, some
platforms just haven't sent any PHY driver upstream and have their own
hacked up solution to avoid using the PHY layer.
Your commit log really needs quite some extra work. What are you trying
to achieve ? Is this related to AM437x which doesn't have a USB3 PHY due
to the way the HW was wired up ? If so, please mention it. Explain how
AM437x HW was wired up, why it lacks a USB3 PHY and why we should
support it the way you want.
That sort of detail needs to be clear in the commit log, specially
considering the peculiar nature of AM43xx which uses a USB3 IP in
USB2-only mode, that needs to be documented in the commit log :-)
cheers
--
balbi
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next prev parent reply other threads:[~2014-01-21 14:47 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-25 10:01 [PATCH v3 00/10] Make dwc3 use Generic PHY Framework Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 01/10] usb: dwc3: invoke phy_resume after phy_init Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 02/10] usb: dwc3: power off usb phy in error path Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 03/10] usb: dwc3: preparation for adapting dwc3 to generic phy framework Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 04/10] usb: dwc3: use quirks to know if a particualr platform doesn't have PHY Kishon Vijay Abraham I
2013-11-25 21:21 ` Felipe Balbi
2013-12-04 14:40 ` Heikki Krogerus
2013-12-05 6:34 ` Kishon Vijay Abraham I
2013-12-05 7:58 ` Heikki Krogerus
2013-12-09 7:13 ` Kishon Vijay Abraham I
2013-12-09 9:26 ` Heikki Krogerus
2013-12-11 8:53 ` Heikki Krogerus
2013-12-11 9:07 ` Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 05/10] usb: dwc3: adapt dwc3 core to use Generic PHY Framework Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 06/10] Documentation: dt bindings: move ..usb/usb-phy.txt to ..phy/ti-phy.txt Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 07/10] drivers: phy: usb3/pipe3: Adapt pipe3 driver to Generic PHY Framework Kishon Vijay Abraham I
2013-12-06 14:35 ` Roger Quadros
2013-12-10 14:40 ` Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 08/10] usb: phy: omap-usb2: remove *set_suspend* callback from omap-usb2 Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 09/10] phy: omap-usb2: move omap_usb.h from linux/usb/ to linux/phy/ Kishon Vijay Abraham I
2013-11-25 10:01 ` [PATCH v3 10/10] arm/dts: added dt properties to adapt to the new phy framwork Kishon Vijay Abraham I
[not found] ` <1385373690-12170-1-git-send-email-kishon-l0cyMroinI0@public.gmane.org>
2014-01-21 10:11 ` [PATCH 1/2] usb: dwc3: core: continue probing if usb phy library returns -ENODEV/-ENXIO Kishon Vijay Abraham I
[not found] ` <1390299099-14764-1-git-send-email-kishon-l0cyMroinI0@public.gmane.org>
2014-01-21 10:11 ` [PATCH v4 2/2] usb: dwc3: adapt dwc3 core to use Generic PHY Framework Kishon Vijay Abraham I
2014-01-21 14:00 ` Roger Quadros
2014-01-22 6:04 ` Vivek Gautam
2014-01-22 7:59 ` Roger Quadros
2014-01-22 10:14 ` Kishon Vijay Abraham I
2014-01-21 13:53 ` [PATCH 1/2] usb: dwc3: core: continue probing if usb phy library returns -ENODEV/-ENXIO Roger Quadros
2014-01-21 14:47 ` Felipe Balbi [this message]
2014-01-24 14:09 ` Kishon Vijay Abraham I
[not found] ` <20140121144725.GF30451-HgARHv6XitL9zxVx7UNMDg@public.gmane.org>
2014-01-27 15:08 ` Heikki Krogerus
2014-01-27 16:05 ` Felipe Balbi
2014-01-28 15:32 ` Heikki Krogerus
2014-01-28 16:30 ` Felipe Balbi
2014-01-29 14:47 ` Heikki Krogerus
2014-02-12 9:46 ` Kishon Vijay Abraham I
[not found] ` <52FB42DE.4090203-l0cyMroinI0@public.gmane.org>
2014-02-19 12:37 ` Roger Quadros
2014-02-21 12:25 ` Kishon Vijay Abraham I
2014-02-21 12:29 ` Roger Quadros
2014-02-24 9:51 ` Kishon Vijay Abraham I
2014-02-24 11:05 ` Roger Quadros
2014-02-24 14:24 ` Kishon Vijay Abraham I
2014-02-24 15:49 ` Felipe Balbi
2014-02-24 9:55 ` Kishon Vijay Abraham I
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