linux-kernel - Re: [PATCH 1/5] ARM: dts: lpc32xx: add bus surfix for simple-bus

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Message-ID: <aRdWoQ/vPplF0aQA@lizhi-Precision-Tower-5810>
Date: Fri, 14 Nov 2025 11:19:45 -0500
From: Frank Li <Frank.li@....com>
To: Vladimir Zapolskiy <vz@...ia.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	"moderated list:ARM/LPC32XX SOC SUPPORT" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 1/5] ARM: dts: lpc32xx: add bus surfix for simple-bus

On Fri, Nov 14, 2025 at 01:55:50AM +0200, Vladimir Zapolskiy wrote:
> Hi Frank.
>
> On 10/29/25 22:27, Frank Li wrote:
> > add bus surfix for simple-bus to fix below CHECK_DTBS warnings:
>
> typo in the subject and in the commit message above, s/surfix/suffix/
>
> > arm/boot/dts/nxp/lpc/lpc3250-ea3250.dtb: usb (simple-bus): $nodename:0: 'usb' does not match '^([a-z][a-z0-9\\-]+-bus|bus|localbus|soc|axi|ahb|apb)(@.+)?$'
> >          from schema $id: http://devicetree.org/schemas/simple-bus.yaml#
> >
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >   arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi | 6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi b/arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi
> > index 2236901a00313..9790b0a1d6537 100644
> > --- a/arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi
> > +++ b/arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi
> > @@ -86,7 +86,7 @@ dma: dma-controller@...00000 {
> >   			#dma-cells = <2>;
> >   		};
> > -		usb {
> > +		usb-bus {
>
> Device nodes under "usb" should be just elevated, the "simple-bus" here
> was used only to group some controllers together.
>
> >   			#address-cells = <1>;
> >   			#size-cells = <1>;
> >   			compatible = "simple-bus";
> > @@ -307,14 +307,14 @@ mpwm: pwm@...e8000 {
> >   			};
> >   		};
> > -		fab {
> > +		fab-bus {
>
> FAB shall find its place in the AXI/AHB/APB/... list, isn't it?

what's FAB means? It is too short and hard to find exact information
from google?

Frank
>
> >   			#address-cells = <1>;
> >   			#size-cells = <1>;
> >   			compatible = "simple-bus";
> >   			ranges = <0x20000000 0x20000000 0x30000000>;
> >   			/* System Control Block */
> > -			scb {
> > +			scb-bus {
> >   				compatible = "simple-bus";
> >   				ranges = <0x0 0x40004000 0x00001000>;
> >   				#address-cells = <1>;
>
> Here "simple-bus" is also unjustified...
>
> --
> Best wishes,
> Vladimir