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From: Peter Chen <peter.chen@nxp.com>
To: "Marek Szyprowski" <m.szyprowski@samsung.com>,
	"Måns Rullgård" <mans@mansr.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	"linux-samsung-soc@vger.kernel.org" 
	<linux-samsung-soc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Markus Reichl <m.reichl@fivetechno.de>,
	Krzysztof Kozlowski <krzk@kernel.org>
Subject: RE: [PATCH v3] usb: core: verify devicetree nodes for USB devices
Date: Mon, 13 May 2019 09:00:41 +0000	[thread overview]
Message-ID: <VI1PR04MB5327B425756FA394C51525208B0F0@VI1PR04MB5327.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <7c5579d2-634a-d705-a451-563939957d57@samsung.com>

 
> 
> On 2019-05-10 05:10, Peter Chen wrote:
> >
> >> Marek Szyprowski <m.szyprowski@samsung.com> writes:
> >>> Commit 69bec7259853 ("USB: core: let USB device know device node")
> >>> added support for attaching devicetree node for USB devices. The
> >>> mentioned commit however identifies the given USB device node only by the
> 'reg'
> >>> property in the host controller children nodes. The USB device node
> >>> however also has to have a 'compatible' property as described in
> >>> Documentation/devicetree/bindings/usb/usb-device.txt. Lack for the
> >>> 'compatible' property check might result in assigning a devicetree
> >>> node, which is not intended to be the proper node for the given USB device.
> >>>
> >>> This is important especially when USB host controller has
> >>> child-nodes for other purposes. For example, Exynos EHCI and OHCI
> >>> drivers already define child-nodes for each physical root hub port
> >>> and assigns respective PHY controller and parameters for them. Those
> >>> binding predates support for USB devicetree nodes.
> >>>
> >>> Checking for the proper compatibility string allows to mitigate the
> >>> conflict between USB device devicetree nodes and the bindings for
> >>> USB controllers with child nodes. It also fixes the side-effect of
> >>> the other commits, like 01fdf179f4b0 ("usb: core: skip interfaces
> >>> disabled in devicetree"), which incorrectly disables some devices on
> >>> Exynos based boards.
> > Hi Marek,
> >
> > The purpose of your patch is do not set of_node for device under USB controller,
> right?
> 
> Right.
> 

Do you mind doing it at function exynos_ehci_get_phy of ehci-exynos.c?

Peter

  reply	other threads:[~2019-05-13  9:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190507125630eucas1p1c5fd171a8dc2a6b8eb9dd317fe245f0c@eucas1p1.samsung.com>
2019-05-07 12:56 ` [PATCH] usb: core: verify devicetree nodes for disabled interfaces Marek Szyprowski
2019-05-07 13:24   ` Måns Rullgård
2019-05-08 10:14     ` Marek Szyprowski
     [not found]       ` <CGME20190508104442eucas1p2ebdffa348465f2c28177601014614853@eucas1p2.samsung.com>
2019-05-08 10:44         ` [PATCH v2] " Marek Szyprowski
2019-05-08 11:46           ` Måns Rullgård
2019-05-08 13:49             ` Marek Szyprowski
2019-05-08 15:27               ` Måns Rullgård
     [not found]                 ` <CGME20190509084827eucas1p294962744fe70745c50b69a5349b5de68@eucas1p2.samsung.com>
2019-05-09  8:47                   ` [PATCH v3] usb: core: verify devicetree nodes for USB devices Marek Szyprowski
2019-05-09 18:55                     ` Måns Rullgård
2019-05-10  3:10                       ` Peter Chen
2019-05-10  9:43                         ` Marek Szyprowski
2019-05-13  9:00                           ` Peter Chen [this message]
2019-05-13  9:07                             ` Marek Szyprowski
2019-05-13  9:23                               ` Peter Chen
2019-05-13 10:03                                 ` Marek Szyprowski
2019-05-13 10:06                                   ` Måns Rullgård
2019-05-17 11:15                                     ` Marek Szyprowski
2019-05-13 10:03                           ` Måns Rullgård
2019-05-17 11:18                             ` Marek Szyprowski
2019-05-09 19:04                     ` Tobias Jakobi

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