From: Rob Herring <robh@kernel.org>
To: Anup Patel <anup.patel@wdc.com>
Cc: devicetree@vger.kernel.org,
Damien Le Moal <damien.lemoal@wdc.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Emil Renner Berhing <kernel@esmil.dk>,
Anup Patel <anup@brainfault.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org, Atish Patra <atish.patra@wdc.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Alistair Francis <Alistair.Francis@wdc.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v5 4/4] dt-bindings: timer: Add CLINT bindings
Date: Thu, 23 Jul 2020 11:08:06 -0600 [thread overview]
Message-ID: <20200723170806.GA535824@bogus> (raw)
In-Reply-To: <20200723142409.47057-5-anup.patel@wdc.com>
On Thu, Jul 23, 2020 at 07:54:09PM +0530, Anup Patel wrote:
> We add DT bindings documentation for CLINT device.
>
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
> Tested-by: Emil Renner Berhing <kernel@esmil.dk>
> ---
> .../bindings/timer/sifive,clint.yaml | 58 +++++++++++++++++++
> 1 file changed, 58 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/timer/sifive,clint.yaml
>
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> new file mode 100644
> index 000000000000..8ad115611860
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/sifive,clint.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SiFive Core Local Interruptor
> +
> +maintainers:
> + - Palmer Dabbelt <palmer@dabbelt.com>
> + - Anup Patel <anup.patel@wdc.com>
> +
> +description:
> + SiFive (and other RISC-V) SOCs include an implementation of the SiFive
> + Core Local Interruptor (CLINT) for M-mode timer and M-mode 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
> +
> +properties:
> + compatible:
> + items:
> + - const: sifive,clint0
> + - const: sifive,fu540-c000-clint
Wrong order. Most specific goes first.
> +
> + description:
> + Should be "sifive,<chip>-clint" and "sifive,clint<version>".
> + Supported compatible strings are -
> + "sifive,fu540-c000-clint" for the SiFive CLINT v0 as integrated
> + onto the SiFive FU540 chip, and "sifive,clint0" for the SiFive
> + CLINT v0 IP block with no chip integration tweaks.
> + Please refer to sifive-blocks-ip-versioning.txt for details
> +
> + reg:
> + maxItems: 1
> +
> + interrupts-extended:
> + minItems: 1
> +
> +required:
> + - compatible
> + - reg
> + - interrupts-extended
Add:
additionalProperties: false
> +
> +examples:
> + - |
> + clint@2000000 {
timer@...
> + compatible = "sifive,clint0", "sifive,fu540-c000-clint";
> + interrupts-extended = <&cpu1intc 3 &cpu1intc 7
> + &cpu2intc 3 &cpu2intc 7
> + &cpu3intc 3 &cpu3intc 7
> + &cpu4intc 3 &cpu4intc 7>;
> + reg = <0x2000000 0x4000000>;
64MB of register space? Doesn't matter much for 64-bit, but would waste
lots of virtual space (low mem) on 32-bit.
> + };
> +...
> --
> 2.25.1
>
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next prev parent reply other threads:[~2020-07-23 17:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 14:24 [PATCH v5 0/4] Dedicated CLINT timer driver Anup Patel
2020-07-23 14:24 ` [PATCH v5 1/4] RISC-V: Add mechanism to provide custom IPI operations Anup Patel
2020-07-23 14:24 ` [PATCH v5 2/4] clocksource/drivers: Add CLINT timer driver Anup Patel
2020-07-23 14:34 ` Daniel Lezcano
2020-07-23 14:24 ` [PATCH v5 3/4] RISC-V: Remove CLINT related code from timer and arch Anup Patel
2020-07-23 14:35 ` Daniel Lezcano
2020-07-23 14:24 ` [PATCH v5 4/4] dt-bindings: timer: Add CLINT bindings Anup Patel
2020-07-23 17:08 ` Rob Herring [this message]
2020-07-24 2:55 ` Anup Patel
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