Re: [PATCH v5] reset: spacemit: k3: Decouple composite reset lines

[Conor Dooley <conor@kernel.org>]

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On Fri, Mar 20, 2026 at 01:02:04PM +0100, Philipp Zabel wrote:
> On Fr, 2026-03-20 at 11:06 +0000, Yixun Lan wrote:
> > Instead of grouping several different reset lines into one composite
> > reset, decouple them to individual ones which make it more aligned
> > with underlying hardware. And for DWC USB driver, it will match well
> > with the number of the reset property in the DT bindings.
> > 
> > The DWC3 USB host controller in K3 SoC has three reset lines - AHB, VCC,
> > PHY. The PCIe controller also has three reset lines - DBI, Slave, Master.
> > Also three reset lines each for UCIE and RCPU block.
> 
> Although I can't validate correctness of the id-to-bit assignments, the
> changes look consistent.
> 
> I trust that the reason for the grouped reset lines was just
> convenience, and not some hardware limitation that requires them to be
> controlled at the same time.
> 
> There are no patches using the USB/UCIE/RCPU/PCIE resets found on lore,
> so this is not an ABI break.
> 

Eh, I think it's an ABI break either way, but it is being done fast
enough that there's no users since this is new as of -rc1.

Acked-by: Conor Dooley <conor.dooley@microchip.com>

Just be careful Yixun that U-Boot doesn't import and starting using it,
I forget if they use -rc1 or released kernels as their import point.

pw-bot: not-applicable

Cheers,
Conor.

> > As an agreement with maintainer, the reset IDs has been rearranged as
> > contiguous number but keep most part unchanged to avoid break patches
> > which already sent to mailing list. The changes of DT binding header file
> > and reset driver are merged together as one single commit to avoid
> > git-bisect breakage.
> > 
> > Fixes: 938ce3b16582 ("reset: spacemit: Add SpacemiT K3 reset driver")
> > Fixes: 216e0a5e98e5 ("dt-bindings: soc: spacemit: Add K3 reset support and IDs")
> > Signed-off-by: Yixun Lan <dlan@kernel.org>
> 
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> 
> If there are no objections, I'll pick this up into reset/fixes for
> v7.0-rc6.
> 
> regards
> Philipp

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