linux-kernel - Re: [PATCH v5 0/6] ti: k3-am62{a,p}x-sk: add opp frequencies

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Message-ID: <20240925125115.hkdhczffhauy6met@lushly>
Date: Wed, 25 Sep 2024 07:51:15 -0500
From: Nishanth Menon <nm@...com>
To: Dhruva Gole <d-gole@...com>
CC: Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        Andrew Davis
	<afd@...com>, Bryan Brattlof <bb@...com>
Subject: Re: [PATCH v5 0/6] ti: k3-am62{a,p}x-sk: add opp frequencies

On 13:17-20240925, Dhruva Gole wrote:
> On Sep 24, 2024 at 07:15:44 -0500, Nishanth Menon wrote:
> > On 15:20-20240924, Dhruva Gole wrote:
> > [...]
> > > 
> > > I am sorry that this breaks compatibility with older AM625 devicetree.
> > > However, the old devicetree was marking the entire wkup_conf as "syscon",
> > > "simple-mfd" which was wrong and needed to be fixed.
> > > 
> > > This series finally tries to bring order to DT and the driver.
> > > 
> > > However, if there is still any way to maintain the backward
> > > compatibility, then I am open to suggestions. Please try
> > > and understand here that the ask for backward compatibility here
> > > is to ask the driver to support a case where the register offset itself
> > > was to be picked from a different node. I am not sure if there's any
> > > cleaner way to do this.
> > 
> > 
> > Have you tried to handle this with quirks? I am not in favor of breaking
> > backward compatibility.
> 
> I was thinking of something on those lines, but quirks makes sense for
> the case that there's a quirky behaviour in the SoC itself. Here it
> seems to me that we are adding a quirk to handle quirk in some old devicetree.
> 
> There's no way to detect the devicetree version or somehow distinguish
> within the driver if it's an old or a new DT. One way I could think of
> is on these lines:

I suggest going and experimenting a bit. Sorry, changes that break
backward compatibility: NAK!

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D