linux-kernel - Re: [PATCH v2 1/2] dt-bindings: riscv: Add optional DT property riscv,timer-can-wake-cpu

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Message-ID: <Y35ffSHWy4B6v+Pc@spud>
Date:   Wed, 23 Nov 2022 17:59:25 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Anup Patel <anup@...infault.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...shpatra.org>,
        Samuel Holland <samuel@...lland.org>,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: riscv: Add optional DT property
 riscv,timer-can-wake-cpu

On Wed, Nov 23, 2022 at 09:16:55PM +0530, Anup Patel wrote:
> On Wed, Nov 23, 2022 at 7:17 PM Conor Dooley <conor.dooley@...rochip.com> wrote:

> > > Adding a new timer DT node would mean, the RISC-V timer driver
> > > will now be probed using the compatible to the new DT node whereas
> > > the RISC-V timer driver is currently probed using CPU DT nodes.
> >
> > In that case, we would have to retain the ability to match against the
> > "riscv". Spitballing:
> > - add a new timer node
> > - keep matching against "riscv"
> > - look up a timer node during init w/ of_find_matching_node() that
> >   contains any new timer properties
> >
> > I think it's unlikely that this will be the last time we have to add
> > some timer properties & we should avoid doing odd things in a DT to suit
> > an operating system?
> >
> > Would something along those lines work Anup, or am I, yet again, missing
> > something?
> 
> I was already working on v3 along these lines. I will try to post a v3 this
> week itself.

Cool, I'll keep my eyes peeled :)

Thanks Anup!