From: Krzysztof Kozlowski <krzk@kernel.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
Felipe Balbi <balbi@kernel.org>,
Florian Fainelli <f.fainelli@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Wei Xu <xuwei5@hisilicon.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Serge Semin <fancer.lancer@gmail.com>,
lkml <linux-kernel@vger.kernel.org>,
YongQin Liu <yongqin.liu@linaro.org>,
Amit Pundir <amit.pundir@linaro.org>
Subject: Re: [PATCH v2 16/18] arm64: dts: hi3660: Harmonize DWC USB3 DT nodes name
Date: Sat, 19 Dec 2020 12:06:03 +0100 [thread overview]
Message-ID: <20201219110603.GA8061@kozik-lap> (raw)
In-Reply-To: <CALAqxLWGujgR7p8Vb5S_RimRVYxwm5XF-c4NkKgMH-43wEBaWg@mail.gmail.com>
On Fri, Dec 18, 2020 at 09:11:42PM -0800, John Stultz wrote:
> On Wed, Nov 11, 2020 at 1:22 AM Serge Semin
> <Sergey.Semin@baikalelectronics.ru> wrote:
> >
> > In accordance with the DWC USB3 bindings the corresponding node
> > name is suppose to comply with the Generic USB HCD DT schema, which
> > requires the USB nodes to have the name acceptable by the regexp:
> > "^usb(@.*)?" . Make sure the "snps,dwc3"-compatible nodes are correctly
> > named.
> >
> > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> > Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
> > ---
> > arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> > index d25aac5e0bf8..aea3800029b5 100644
> > --- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> > +++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi
> > @@ -1166,7 +1166,7 @@ usb_phy: usb-phy {
> > };
> > };
> >
> > - dwc3: dwc3@ff100000 {
> > + dwc3: usb@ff100000 {
> > compatible = "snps,dwc3";
> > reg = <0x0 0xff100000 0x0 0x100000>;
>
>
> Oof. So this patch is breaking the usb gadget functionality on HiKey960 w/ AOSP.
>
> In order to choose the right controller for gadget mode with AOSP, one
> sets the "sys.usb.controller" property, which until now for HiKey960
> has been "ff100000.dwc3".
> After this patch, the controller isn't found and we would have to
> change userland to use "ff100000.usb", which would then break booting
> on older kernels (testing various LTS releases on AOSP is one of the
> key uses of the HiKey960).
>
> So while I understand the desire to unify the schema, as HiKey960
> really isn't likely to be used outside of AOSP, I wonder if reverting
> this one change is in the best interest of not breaking existing
> userland?
The node names are not part of an ABI, are they? I expect only
compatibles and properties to be stable. If user-space looks for
something by name, it's a user-space's mistake. Not mentioning that you
also look for specific address... Imagine remapping of addresses with
ranges (for whatever reason) - AOSP also would be broken? Addresses are
definitely not an ABI.
Best regards,
Krzysztof
next prev parent reply other threads:[~2020-12-19 11:07 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-11 9:15 [PATCH v2 00/18] dt-bindings: usb: Harmonize xHCI/EHCI/OHCI/DWC3 nodes name Serge Semin
2020-11-11 9:15 ` [PATCH v2 01/18] arm: dts: keystone: Correct DWC USB3 compatible string Serge Semin
2020-11-11 9:15 ` [PATCH v2 02/18] arm64: dts: amlogic: meson-g12: Set FL-adj property value Serge Semin
2020-11-11 9:15 ` [PATCH v2 03/18] arc: dts: Harmonize EHCI/OHCI DT nodes name Serge Semin
2020-11-11 9:15 ` [PATCH v2 04/18] arm: dts: hisi-x5hd2: " Serge Semin
2020-11-25 2:27 ` Wei Xu
2020-11-11 9:15 ` [PATCH v2 05/18] arm: dts: lpc18xx: " Serge Semin
2020-11-11 9:15 ` [PATCH v2 06/18] arm64: dts: hisi: " Serge Semin
2020-11-25 2:27 ` Wei Xu
2020-11-11 9:15 ` [PATCH v2 07/18] mips: dts: jz47x: " Serge Semin
2020-11-12 22:41 ` Thomas Bogendoerfer
2020-11-11 9:15 ` [PATCH v2 08/18] mips: dts: sead3: " Serge Semin
2020-11-12 22:41 ` Thomas Bogendoerfer
2020-11-11 9:15 ` [PATCH v2 09/18] mips: dts: ralink: mt7628a: " Serge Semin
2020-11-12 22:41 ` Thomas Bogendoerfer
2020-11-11 9:15 ` [PATCH v2 10/18] powerpc: dts: akebono: " Serge Semin
2020-11-11 9:15 ` [PATCH v2 11/18] arm64: dts: marvell: cp11x: Harmonize xHCI " Serge Semin
2020-11-30 14:23 ` Gregory CLEMENT
2020-11-11 9:15 ` [PATCH v2 12/18] arm: dts: marvell: armada-375: Harmonize DWC USB3 " Serge Semin
2020-11-30 14:22 ` Gregory CLEMENT
2020-11-11 9:15 ` [PATCH v2 13/18] arm: dts: keystone: " Serge Semin
2020-11-11 9:15 ` [PATCH v2 14/18] arm: dts: stih407-family: " Serge Semin
2020-11-11 9:15 ` [PATCH v2 15/18] arm64: dts: apm: " Serge Semin
2020-11-11 9:15 ` [PATCH v2 16/18] arm64: dts: hi3660: " Serge Semin
2020-11-25 2:23 ` Wei Xu
2020-12-19 5:11 ` John Stultz
2020-12-19 11:06 ` Krzysztof Kozlowski [this message]
2020-12-21 20:24 ` John Stultz
2020-12-21 21:04 ` Krzysztof Kozlowski
2020-11-11 9:15 ` [PATCH v2 17/18] usb: dwc3: qcom: Detect DWC3 DT-nodes with "usb"-prefixed names Serge Semin
2020-11-11 16:05 ` Bjorn Andersson
2020-11-11 9:15 ` [PATCH v2 18/18] arm64: dts: qcom: Harmonize DWC USB3 DT nodes name Serge Semin
2020-11-11 16:08 ` Bjorn Andersson
2020-11-12 18:43 ` Serge Semin
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