linux-kernel - Re: [PATCH v10 00/18] Support spread spectrum clocking for i.MX8M PLLs

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Message-ID: <20250314093503.GD12210@nxa18884-linux>
Date: Fri, 14 Mar 2025 17:35:03 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc: linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
	Peng Fan <peng.fan@....com>, Abel Vesa <abelvesa@...nel.org>,
	linux-amarula@...rulasolutions.com,
	Conor Dooley <conor+dt@...nel.org>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v10 00/18] Support spread spectrum clocking for i.MX8M
 PLLs

On Thu, Mar 06, 2025 at 12:27:49PM +0100, Dario Binacchi wrote:
>This version keeps the version v9 patches that can be merged and
>removes the patches that will need to be modified in case Peng's
>PR https://github.com/devicetree-org/dt-schema/pull/154 is accepted.
>The idea is to speed up the merging of the patches in the series
>that have already been reviewed and are not dependent on the
>introduction of the assigned-clocks-sscs property, and postpone
>the patches for spread spectrum to a future series once it becomes
>clear what needs to be done.
>
Although I give R-b, there is an idea just come out in my mind that this
might break OS distribution that use firmware(e.g. U-Boot) to publish
device tree for Linux Kernel, such as ARM System-Ready complaint OS.
I overlooked this point in previous patchset reviewing.

Since this patchset is to move anatop stuff to a new driver to reflect
the HW truth.  And requires new entries in CCM node, so old bootloader
with new kernel will not boot for OS distribution, such as Fedora/openSuse.

Not sure how to keep backwards support as before. Leave to maintainers
to say if they are ok with this.

Regards,
Peng