linux-kernel - Re: [PATCH 3/3] arm64: dts: layerscape: move dwc3 usb under glue layer node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <ZrOE6Kly4cz7LDfz@lizhi-Precision-Tower-5810>
Date: Wed, 7 Aug 2024 10:30:00 -0400
From: Frank Li <Frank.li@....com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc: Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: Re: [PATCH 3/3] arm64: dts: layerscape: move dwc3 usb under glue
 layer node

On Wed, Aug 07, 2024 at 12:41:09AM +0000, Thinh Nguyen wrote:
> Hi Frank,
>
> On Tue, Jul 30, 2024, Frank Li wrote:
> > On Thu, Jul 11, 2024 at 03:38:46PM -0600, Rob Herring wrote:
> > > On Wed, Jul 10, 2024 at 07:02:24PM -0400, Frank Li wrote:
> > > > New usb glue layer driver support enable dma-coherent. So put dwc3 usb node
> > > > under glue layer node and enable dma-coherent.
> > > >
> > > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > > ---
> > > >  arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 43 ++++++++++++++++----------
> > > >  1 file changed, 26 insertions(+), 17 deletions(-)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > > > index 70b8731029c4e..24b937032480f 100644
> > > > --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > > > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > > > @@ -615,24 +615,33 @@ gpio3: gpio@...0000 {
> > > >  			little-endian;
> > > >  		};
> > > >
> > > > -		usb0: usb@...0000 {
> > > > -			compatible = "fsl,ls1028a-dwc3", "snps,dwc3";
> > > > -			reg = <0x0 0x3100000 0x0 0x10000>;
> > > > -			interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
> > > > -			snps,dis_rxdet_inp3_quirk;
> > > > -			snps,quirk-frame-length-adjustment = <0x20>;
> > > > -			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> > > > -			status = "disabled";
> > > > -		};
> > > > +		usb {
> > > > +			compatible = "fsl,ls1028a-dwc3";
> > > > +			#address-cells = <2>;
> > > > +			#size-cells = <2>;
> > > > +			ranges;
> > >
> > > No, the existing way is preferred unless you have actual glue/wrapper
> > > registers. Plus this breaks compatibility.
> >
> > Actually, it has glue layer, such as wakeup controller. Remote wakeup have
> > not implement at layerscape platform yet. But this register distribute to
> > difference place with other module misc controller registers. It is
> > difference for difference chips. I can think deep how to handle this.
> >
> > but anyways, it will break compatibility. I have not find good way to
> > keep compatibility and add glue layer, such as wakeup support.
> >
> > Frank
> >
>
> Will this impact how the rest of the series look? If so, I'll wait until
> you resolve this issue and review the rest.

Rob:
	I checked many dwc3-of-simple.c compatible string, which have not
'reg' and just have some clocks and reset.

	Is it okay to add missed clock and fsl,rcpm for usb wakeup support
in gluelayer node?

Frank

>
> BR,
> Thinh