Hi Krzysztof Kozlowski,
> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> Sent: Saturday, March 9, 2024 12:26 PM
> Subject: Re: [PATCH 4/4] arm64: dts: renesas: r9a07g0{43,44,54}: Update usbhs family compatible
>
> On 09/03/2024 13:14, Biju Das wrote:
> > Hi Krzysztof Kozlowski,
> >
> > Thanks for the feedback.
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> >> Sent: Saturday, March 9, 2024 12:08 PM
> >> Subject: Re: [PATCH 4/4] arm64: dts: renesas: r9a07g0{43,44,54}:
> >> Update usbhs family compatible
> >>
> >> On 08/03/2024 19:09, Biju Das wrote:
> >>> Replace 'renesas,rza2m-usbhs->renesas,rzg2l-usbhs' as family
> >>> compatible for RZ/G2L family SOCs as there is a difference in number
> >>> of pipe buffers compared to RZ/A2M.
> >>>
> >>> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> >>> ---
> >>> arch/arm64/boot/dts/renesas/r9a07g043.dtsi | 2 +-
> >>> arch/arm64/boot/dts/renesas/r9a07g044.dtsi | 2 +-
> >>> arch/arm64/boot/dts/renesas/r9a07g054.dtsi | 2 +-
> >>> 3 files changed, 3 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> >>> b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> >>> index 8721f4c9fa0f..766c54b91acc 100644
> >>> --- a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> >>> +++ b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> >>> @@ -812,7 +812,7 @@ usb2_phy1: usb-phy@11c70200 {
> >>>
> >>> hsusb: usb@11c60000 {
> >>> compatible = "renesas,usbhs-r9a07g043",
> >>> - "renesas,rza2-usbhs";
> >>> + "renesas,rzg2l-usbhs";
> >>
> >> This looks like ABI break and commit msg is quite vague about it.
> >
> > OK, Will update the commit message as driver is taking care of the
> > backward compatibility.
>
> Ah, I was not precise here, you should consider the impact this is on DTB used on other kernels. You
> guys should really stop using imprecise/incorrect generic fallbacks and, since it is usually tricky to
> know which fallback is correct or not, you should stop using them at all.
There will be driver change to handle SoC specific compatible.
So ,
old DTB + old kernel will have 16 pipe buffers
old DTB + newer kernel will have 9 pipe buffers.
New DTB + new kernel will have 9 pipe buffer.
Cheer,
Biju
