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

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Message-Id: <20200627161957.134376-6-anup.patel@wdc.com>
Date:   Sat, 27 Jun 2020 21:49:57 +0530
From:   Anup Patel <anup.patel@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     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, Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH v2 5/5] dt-bindings: timer: Add CLINT bindings

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

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
+  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";
+		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