linux-kernel - Re: [PATCH] clk: COMMON_CLK

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Message-ID: <CAK9=C2VC2OHzNFXgxZ4eDCUv8MGsjK1OdrD0FR4WUSrOsyFemA@mail.gmail.com>
Date: Thu, 2 Oct 2025 20:04:39 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Conor Dooley <conor@...nel.org>
Cc: Paul Walmsley <pjw@...nel.org>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	Rahul Pathak <rpathak@...tanamicro.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, linux-clk@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: COMMON_CLK_RPMI should depend on RISCV

On Thu, Oct 2, 2025 at 3:06 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Wed, Oct 01, 2025 at 07:15:56PM -0600, Paul Walmsley wrote:
> > On Tue, 30 Sep 2025, Geert Uytterhoeven wrote:
> >
> > > The RISC-V platform management interface (RPMI) is only available on
> > > RISC-V platforms.  Hence add a dependency on RISCV, to prevent asking
> > > the user about this driver when configuring a kernel for a different
> > > architecture.
> > >
> > > Fixes: 5ba9f520f41a33c9 ("clk: Add clock driver for the RISC-V RPMI clock service group")
> > > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > Thanks Geert for catching this.
> >
> > This patch is against unmerged patches in -next.  So I'll plan to add this
> > to the PR that I plan to send to Linus tomorrow -- unless any of the
> > drivers/clk maintainers would prefer that I not.
> >
> > > And perhaps the "default RISCV" should be dropped, too?
> >
> > Probably.  I guess we should just add this to the arch/riscv defconfig
> > instead.  Let's wait on this one for a few days to see if anyone has any
> > comments, and consider that change for v6.18-rc fixes.
>
> There's little point having "default RISCV" if it's only available on
> RISCV in the first place, may as well just be "default y" and be
> simpler.
>
> My 2c is that putting it in defconfig is barely worth doing, unless there
> are actual platforms that use it.
> Does QEMU provide a useful test for it that exercises the various code
> paths, that would make it worthwhile to have in defconfig Anup?

Yes, QEMU RPMI support is in the pipeline. The OpenSBI
upstreaming was completed few months back and Linux patches
are going in this merge window (Linux-6.18)

We (Ventana) have already made the QEMU RPMI implementation
public which can be tried until QEMU RPMI upstreaming is completed.
(Refer, dev-upstream branch of https://github.com/ventanamicro/qemu.git)

NOTE: these details are mentioned in cover-letter as well.
(Refer, https://www.spinics.net/lists/linux-clk/msg118229.html)

Regards,
Anup