Re: [PATCH v2 0/8] Add support for StarFive VisionFive 2 Lite board

From: Conor Dooley <conor@kernel.org>
To: Hal Feng <hal.feng@starfivetech.com>
Cc: "E Shattow" <e@freeshell.de>,
	"Emil Renner Berthing" <emil.renner.berthing@canonical.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Conor Dooley" <conor+dt@kernel.org>,
	"Heinrich Schuchardt" <heinrich.schuchardt@canonical.com>,
	"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
	"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Manivannan Sadhasivam" <mani@kernel.org>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Paul Walmsley" <pjw@kernel.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 0/8] Add support for StarFive VisionFive 2 Lite board
Date: Tue, 18 Nov 2025 23:10:08 +0000	[thread overview]
Message-ID: <20251118-throwing-marina-14a87d65465a@spud> (raw)
In-Reply-To: <ZQ2PR01MB1307DADE17FFEFCE70C3F391E6D62@ZQ2PR01MB1307.CHNPR01.prod.partner.outlook.cn>

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On Tue, Nov 18, 2025 at 02:12:58AM +0000, Hal Feng wrote:
> > All,
> > 
> > I repeat that the suggestion was made months ago (by Hal) to split out the
> > OPP tables per-board from the period of time when I was complaining about
> > 1.5GHz JH-7110 operation pushing TDP into over-temperature thermal limit
> > on Milk-V Mars CM SoM.
> > 
> > Whether or not JH7110S is a new compatible should follow precedence in
> > Linux development. JH-7110S is evidently the same tape-out as JH-7110 and
> > however you deal with that in Linux is the appropriate way to deal with that
> > here. Selection of OPP table for correct operation will be determined by
> > bootloader, where, it is demonstrated by patch series sent to U-Boot
> > upstream to be selected ** per-board ** based on EEPROM content as if it
> > was any other JH-7110 board deciding dts based on EEPROM content. Given
> > that it is the same tape-out I do not find a valid justification for a new
> > compatible in the stack of adjacent software besides going along with some
> > kind of marketing-driven answer about whether or not this is a new SoC.
> > 
> > What I care about now is that the VisionFive 2 Lite series is in good enough
> > shape and there's a possibility to act on this months-old suggestion to split out
> > the OPP tables which as we have confirmed the JH7110S is the same SoC as
> > JH7110 it makes a lot of sense to do.
> > 
> > How is it supposed to work for binned silicon in Linux?
> 
> Hi, Conor,  Emil, 
> 
> What do you think about this? Hope to hear from you.

Can someone just give me a yes/no question out of this thread? I'm not
really immediately sure what's being asked of me. What exactly do you
want to do with the opp-tables? "Split out" isn't super clear. Does that
mean into board files? I am guessing it does, since you're saying that a
particular board cannot support the 1.5 GHz mode. It's not unusual
though to use delete node for unsupported opp-table entries, could that
be done instead?

FWIW, this weekend is -rc7, so I won't be applying any new material
after that.

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