linux-kernel - Re: [PATCH NOT APPLY v2 4/4] clk: scmi: Support spread spectrum

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Message-ID: <Z9GjRhQmsu0fBoWG@pluto>
Date: Wed, 12 Mar 2025 15:07:50 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: Peng Fan <peng.fan@....nxp.com>
Cc: Cristian Marussi <cristian.marussi@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Sudeep Holla <sudeep.holla@....com>,
	Abel Vesa <abelvesa@...nel.org>, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, imx@...ts.linux.dev,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH NOT APPLY v2 4/4] clk: scmi: Support spread spectrum

On Mon, Mar 10, 2025 at 04:16:35PM +0800, Peng Fan wrote:
> On Wed, Mar 05, 2025 at 05:29:54PM +0000, Cristian Marussi wrote:
> >On Mon, Mar 03, 2025 at 12:11:25PM +0800, Peng Fan wrote:
> >> Hi Cristian,
> >> 
> >> On Thu, Feb 06, 2025 at 12:26:32PM +0000, Cristian Marussi wrote:
> >> >On Wed, Feb 05, 2025 at 05:49:54PM +0800, Peng Fan (OSS) wrote:
> >> >> From: Peng Fan <peng.fan@....com>
> >> >> 
> >> >> Support Spread Spectrum with adding scmi_clk_set_spread_spectrum
> >> >> 
> >> >
> >> >Hi,
> >> >
> >> >I forwarded ATG with our latest exchange on the possibility of using a
> >> >standard OEM type instead of Vendor one if it is general enough....
> >> 
> >> Do you have any update?
> >> 
> >
> >Yes I think you can go on with your original plan of using vendor OEM
> >types: as of now we are not gonna standardize a new commmon SCMI type
> >for Clock-SS, given there is really just one SCMI user of such clock
> >features...maybe in the future if more users shows up...
> 
> Thanks for updating me. Back to how to add extensions in clk-scmi.c,
> do you have any suggestions? I am thinking to provide vendor/sub-vendor
> for clk-scmi.c and use vendor "NXP" sub-vedor "IMX" for spread spectrum.
> 

Definitely based on vendors subvendors, not sure about how, I have not
really though about the details: you also shoudl consider that the new
clk ops for spread spectrum should be registered ONLY when you are on a
supported platform (of course) AND the OEM types nnamespace is per-vendor:
like vendor protocols your NXP OEM config type 0x80 must coexist with any
future possible OTHER_VENDOR OEM ConfigType 0x80.

Thanks,
Cristian