linux-kernel - Re: [PATCH v2 5/5] dt-bindings: timer: Add CLINT bindings

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Message-ID: <20200714023748.GA1164267@bogus>
Date:   Mon, 13 Jul 2020 20:37:48 -0600
From:   Rob Herring <robh@...nel.org>
To:     Anup Patel <anup.patel@....com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Damien Le Moal <damien.lemoal@....com>,
        Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: Re: [PATCH v2 5/5] dt-bindings: timer: Add CLINT bindings

On Sat, Jun 27, 2020 at 09:49:57PM +0530, Anup Patel wrote:
> We add DT bindings documentation for CLINT device.
> 
> Signed-off-by: Anup Patel <anup.patel@....com>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> ---
>  .../bindings/timer/sifive,clint.txt           | 34 +++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/sifive,clint.txt

Bindings should be in DT schema format now.

> 
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.txt b/Documentation/devicetree/bindings/timer/sifive,clint.txt
> new file mode 100644
> index 000000000000..45b75347a7d5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.txt
> @@ -0,0 +1,34 @@
> +SiFive Core Local Interruptor (CLINT)
> +-------------------------------------
> +
> +SiFive (and other RISC-V) SOCs include an implementation of the SiFive Core
> +Local Interruptor (CLINT) for M-mode timer and inter-processor interrupts.
> +
> +It directly connects to the timer and inter-processor interrupt lines of
> +various HARTs (or CPUs) so RISC-V per-HART (or per-CPU) local interrupt
> +controller is the parent interrupt controller for CLINT device.
> +
> +The clock frequency of CLINT is specified via "timebase-frequency" DT
> +property of "/cpus" DT node. The "timebase-frequency" DT property is
> +described in: Documentation/devicetree/bindings/riscv/cpus.yaml
> +
> +Required properties:
> +- compatible : should be "riscv,clint0" or "sifive,clint-1.0.0". A specific

A new versioning scheme from SiFive? To review, we don't do version 
numbers unless there's a well defined and documented scheme. IOW, one 
that's not s/w folks just making up v1, v2, v3, etc.

> +  string identifying the actual implementation can be added if implementation
> +  specific worked arounds are needed.
> +- reg : Should contain 1 register range (address and length).
> +- interrupts-extended : Specifies which HARTs (or CPUs) are connected to
> +  the CLINT.  Each node pointed to should be a riscv,cpu-intc node, which
> +  has a riscv node as parent.
> +
> +Example:
> +
> +	clint@...0000 {
> +		compatible = "sifive,clint-1.0.0", "sifive,fu540-c000-clint";

Doesn't match the binding.

> +		interrupts-extended = <
> +			&cpu1-intc 3 &cpu1-intc 7
> +			&cpu2-intc 3 &cpu2-intc 7
> +			&cpu3-intc 3 &cpu3-intc 7
> +			&cpu4-intc 3 &cpu4-intc 7>;
> +		reg = <0x2000000 0x4000000>;
> +	};
> -- 
> 2.25.1
>