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Message-ID: <20231204-germproof-venue-6874ad902323@spud>
Date: Mon, 4 Dec 2023 16:18:13 +0000
From: Conor Dooley <conor@...nel.org>
To: Inochi Amaoto <inochiama@...look.com>
Cc: 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>,
Chen Wang <unicorn_wang@...look.com>,
Anup Patel <anup@...infault.org>,
Samuel Holland <samuel.holland@...ive.com>,
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 v5 1/2] dt-bindings: timer: thead,c900-aclint-mtimer:
separate mtime and mtimecmp regs
On Mon, Dec 04, 2023 at 05:51:08PM +0800, 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 introduced a new type of T-HEAD aclint timer which
> has clint timer layout. Although it has the clint timer 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
> regs-names to represent the mtimecmp register, which can avoid hack
> for unsupport mtime register of T-HEAD aclint timer.
>
> Also, as T-HEAD aclint only supports mtimecmp, it is unnecessary to
> implement the whole aclint spec. To make this binding T-HEAD specific,
> only add reg-name for existed register. For details, see the discussion
> in the last link.
>
> 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
> Link: https://lore.kernel.org/all/IA1PR20MB4953F9D77FFC76A9D236922DBBB6A@IA1PR20MB4953.namprd20.prod.outlook.com/
Acked-by: Conor Dooley <conor.dooley@...rochip.com>
Although, I figure it is going to be me that ends up taking it.
Cheers,
Conor.
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