linux-kernel - Re: [PATCH v2 1/2] dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs

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Message-ID: <20231114-outweigh-sandbank-6bbdd7ea3286@squawk>
Date:   Tue, 14 Nov 2023 15:21:48 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Inochi Amaoto <inochiama@...look.com>
Cc:     Chen Wang <unicorn_wang@...look.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] dt-bindings: timer: thead,c900-aclint-mtimer:
 separate mtime and mtimecmp regs

On Tue, Nov 14, 2023 at 09:45:33AM +0800, Inochi Amaoto wrote:
> >On 2023/11/14 8:45, Inochi Amaoto wrote:
> >> The timer registers of aclint don't follow the clint layout and can
> >> be mapped on any different offset. As sg2042 uses separated timer
> >> and mswi for its clint, it should follow the aclint spec and have
> >> separated registers.
> >>
> >> The previous patch introduces a new type of T-HEAD aclint timer which
> >> has clint timer layout. Although the timer has the clint layout, it
> >> should follow the aclint spec and uses the separated mtime and mtimecmp
> >> regs. So a ABI change is needed to make the timer fit the aclint spec.
> >>
> >> To make T-HEAD aclint timer more closer to the aclint spec, use two regs
> >> to represent the mtime and mtimecmp.
> >>
> >> Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> >> Fixes: 4734449f7311 ("dt-bindings: timer: Add Sophgo sg2042 CLINT timer")
> >> Link: https://lists.infradead.org/pipermail/opensbi/2023-October/005693.html
> >> Link: https://github.com/riscv/riscv-aclint/blob/main/riscv-aclint.adoc
> >> ---
> >>   .../devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml  | 5 +++--
> >>   1 file changed, 3 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml b/Documentation/devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml
> >> index fbd235650e52..c3080962d902 100644
> >> --- a/Documentation/devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml
> >> +++ b/Documentation/devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml
> >> @@ -17,7 +17,7 @@ properties:
> >>         - const: thead,c900-aclint-mtimer
> >>
> >>     reg:
> >> -    maxItems: 1
> >> +    maxItems: 2
> >
> >The first one is for mtime and the second one is for mtimecmp, right?
> 
> Yes, that is right.
> 
> >Recommend to add some comment in binding file to make it clear.
> >
> 
> Thanks for your advice.

Sorry for not noticing that on v1 - you should indeed describe these in
the binding, by using the items property.

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