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

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Message-ID: <c952d708-fd56-408b-ad16-15c1c013c396@ti.com>
Date: Thu, 17 Apr 2025 18:04:17 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Nishanth Menon <nm@...com>
CC: Siddharth Vadapalli <s-vadapalli@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <u-kumar1@...com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>
Subject: Re: [PATCH 0/2] J722S: DT Node cleanup for serdes0 and serdes1

On Mon, Apr 14, 2025 at 08:13:19PM +0530, Siddharth Vadapalli wrote:
> 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@ti.com/
> > > > > 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@ti.com/
> > > 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.

I have squashed the series and have posted it at:
https://lore.kernel.org/r/20250417123246.2733923-1-s-vadapalli@ti.com

Regards,
Siddharth.