Re: [PATCH 0/2] J722S: DT Node cleanup for serdes0 and serdes1

[Siddharth Vadapalli]

On Mon, Apr 14, 2025 at 09:39:16AM -0500, Nishanth Menon wrote:
> On 18:30-20250414, Siddharth Vadapalli wrote:
> > On Mon, Apr 14, 2025 at 07:09:30AM -0500, Nishanth Menon wrote:
> > 
> > Hello Nishanth,
> > 
> > > On 10:57-20250412, Siddharth Vadapalli wrote:
> > > > Hello,
> > > > 
> > > > This series is based on the following series:
> > > > https://patchwork.kernel.org/project/linux-arm-kernel/cover/20250408103606.3679505-1-s-vadapalli@xxxxxx/
> > > > Based on the discussion in the above series which disabled 'serdes_wiz0'
> > > > and 'serdes_wiz1' nodes in the SoC file and enabled them in the board
> > > > file, Udit pointed out that it wasn't necessary to disable 'serdes0' and
> > > > 'serdes1' in the SoC file anymore, since that is not a working
> > > > configuration - serdes_wizX enabled and serdesX disabled doesn't work.
> > > > 
> > > > Hence, this series aims to cleanup the serdesX nodes after the changes
> > > > made by the above series.
> > > > 
> > > > Regards,
> > > > Siddharth.
> > > > 
> > > > Siddharth Vadapalli (2):
> > > >   arm64: dts: ti: k3-j722s-main: don't disable serdes0 and serdes1
> > > >   arm64: dts: ti: k3-j722s-evm: drop redundant status within
> > > >     serdes0/serdes1
> > > > 
> > > >  arch/arm64/boot/dts/ti/k3-j722s-evm.dts   | 2 --
> > > >  arch/arm64/boot/dts/ti/k3-j722s-main.dtsi | 4 ----
> > > >  2 files changed, 6 deletions(-)
> > > > 
> > > > -- 
> > > > 2.34.1
> > > > 
> > > 
> > > 
> > > I do not understand the logic here. serdes cannot operate without wiz
> > > nodes, correct? why would we leave serdes on by default?
> > 
> > Yes, serdesX requires serdes_wizX, but at the same time, serdesX is the
> > child node of serdes_wizX. Therefore, without enabling serdes_wizX, we
> > cannot enable serdesX.
> > 
> > Prior to this series, but with the dependent series at:
> > https://patchwork.kernel.org/project/linux-arm-kernel/cover/20250408103606.3679505-1-s-vadapalli@xxxxxx/
> > applied, the nodes look like:
> > 
> > 	serdes_wizX {
> > 		...
> > 		status = "disabled";
> > 
> > 		serdesX {
> > 			...
> > 			status = "disabled";
> > 		};
> > 	};
> > 
> > The dependent series fixes 'serdes_wizX' by disabling it in the SoC file
> > k3-j722s-main.dtsi. But after the fix, we have a 'status = "disabled";'
> > within the serdesX node which isn't required since:
> > a) serdes_wizX enabled but serdesX disabled is non-functional and
> > unusable
> > b) serdes_wizX disabled in DT implies that serdesX is also disabled
> 
> 
> Can we handle all of this in one series instead of two series?

The idea behind splitting it was that the dependent series is a "Fix":
- Fix to follow the convention of disabling nodes in SoC file and enable
  them in the board file.
while the current series is a "cleanup":
- No fixes are introduced by this series and therefore it doesn't
  require a backport.

I can squash the two series and post them as a v2 if that helps.

Regards,
Siddharth.