linux-kernel - RE: [PATCH v3] usb: core: verify devicetree nodes for USB devices

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Message-ID: <VI1PR04MB5327B425756FA394C51525208B0F0@VI1PR04MB5327.eurprd04.prod.outlook.com>
Date:   Mon, 13 May 2019 09:00:41 +0000
From:   Peter Chen <peter.chen@....com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Måns Rullgård <mans@...sr.com>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Markus Reichl <m.reichl@...etechno.de>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: RE: [PATCH v3] usb: core: verify devicetree nodes for USB devices

 
> 
> On 2019-05-10 05:10, Peter Chen wrote:
> >
> >> Marek Szyprowski <m.szyprowski@...sung.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