linux-kernel - Re: [PATCH v3 1/2] dt-bindings: timer: mti,gcru

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Message-ID: <1b72b68a-ad20-48b9-9a8e-c58ad6b15017@kernel.org>
Date: Thu, 24 Apr 2025 08:24:22 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Aleksa Paunovic <aleksa.paunovic@...cgroup.com>,
 "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Cc: Djordje Todorovic <djordje.todorovic@...cgroup.com>,
 Palmer Dabbelt <palmer@...belt.com>, Conor Dooley <conor@...nel.org>,
 Aleksandar Rikalo <arikalo@...il.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: timer: mti,gcru

On 23/04/2025 14:14, Aleksa Paunovic wrote:
> HTEC Public

Fix your email systems or use b4 relay.


<form letter>
Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC (and consider --no-git-fallback argument, so you will
not CC people just because they made one commit years ago). It might
happen, that command when run on an older kernel, gives you outdated
entries. Therefore please be sure you base your patches on recent Linux
kernel.

Tools like b4 or scripts/get_maintainer.pl provide you proper list of
people, so fix your workflow. Tools might also fail if you work on some
ancient tree (don't, instead use mainline) or work on fork of kernel
(don't, instead use mainline). Just use b4 and everything should be
fine, although remember about `b4 prep --auto-to-cc` if you added new
patches to the patchset.
</form letter>

> 
> Add dt-bindings for the GCR.U memory mapped timer device for RISC-V
> platforms. The GCR.U memory region contains shadow copies of the RISC-V
> mtime register and the hrtime Global Configuration Register.
> 
> Signed-off-by: Aleksa Paunovic <aleksa.paunovic@...cgroup.com>
> ---
>  .../devicetree/bindings/timer/mti,gcru.yaml   | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/mti,gcru.yaml
> 
> diff --git a/Documentation/devicetree/bindings/timer/mti,gcru.yaml b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
> new file mode 100644
> index 000000000000..6555dbab402e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/mti,gcru.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GCR.U timer device for RISC-V platforms
> +
> +maintainers:
> +  - Aleksa Paunovic <aleksa.paunovic@...cgroup.com>
> +
> +description:
> +  The GCR.U memory region contains memory mapped shadow copies of
> +  mtime and hrtime Global Configuration Registers,
> +  which software can choose to make accessible from user mode.
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        const: mti,gcru
> +
> +  required:
> +    - compatible

Drop select, why do you need it?

> +
> +properties:
> +  compatible:
> +    const: mti,gcru
> +
> +  reg:
> +    items:
> +      - description: Read-only shadow copy of the RISC-V mtime register.
> +      - description: Read-only shadow copy of the high resolution timer register.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gcru: timer@...7F000 {

Lower-case hex in DTS, always. See DTS coding style.

Best regards,
Krzysztof