linux-kernel - Re: [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch

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Message-ID: <20210308203841.GA2906683@robh.at.kernel.org>
Date:   Mon, 8 Mar 2021 13:38:41 -0700
From:   Rob Herring <robh@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch_timer: Add
 interrupt-names support

On Fri, Mar 05, 2021 at 06:38:41AM +0900, Hector Martin wrote:
> Not all platforms provide the same set of timers/interrupts, and Linux
> only needs one (plus kvm/guest ones); some platforms are working around
> this by using dummy fake interrupts. Implementing interrupt-names allows
> the devicetree to specify an arbitrary set of available interrupts, so
> the timer code can pick the right one.
> 
> This also adds the hyp-virt timer/interrupt, which was previously not
> expressed in the fixed 4-interrupt form.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  .../devicetree/bindings/timer/arm,arch_timer.yaml  | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/timer/arm,arch_timer.yaml b/Documentation/devicetree/bindings/timer/arm,arch_timer.yaml
> index 2c75105c1398..ebe9b0bebe41 100644
> --- a/Documentation/devicetree/bindings/timer/arm,arch_timer.yaml
> +++ b/Documentation/devicetree/bindings/timer/arm,arch_timer.yaml
> @@ -34,11 +34,25 @@ properties:
>                - arm,armv8-timer
>  
>    interrupts:
> +    minItems: 1
> +    maxItems: 5
>      items:
>        - description: secure timer irq
>        - description: non-secure timer irq
>        - description: virtual timer irq
>        - description: hypervisor timer irq
> +      - description: hypervisor virtual timer irq
> +
> +  interrupt-names:
> +    minItems: 1
> +    maxItems: 5
> +    items:
> +      enum:
> +        - phys-secure
> +        - phys
> +        - virt
> +        - hyp-phys
> +        - hyp-virt

phys-secure and hyp-phys is not very consistent. secure-phys or sec-phys 
instead?

This allows any order which is not ideal (unfortunately json-schema 
doesn't have a way to define order with optional entries in the middle). 
How many possible combinations are there which make sense? If that's a 
reasonable number, I'd rather see them listed out.

Rob