[PATCH v3 4/4] dt-bindings: timer: Add CLINT bindings

From: Anup Patel <anup.patel@wdc.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Rob Herring <robh+dt@kernel.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: devicetree@vger.kernel.org,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	Anup Patel <anup@brainfault.org>, Anup Patel <anup.patel@wdc.com>,
	linux-kernel@vger.kernel.org, Atish Patra <atish.patra@wdc.com>,
	Alistair Francis <Alistair.Francis@wdc.com>,
	linux-riscv@lists.infradead.org
Subject: [PATCH v3 4/4] dt-bindings: timer: Add CLINT bindings
Date: Wed, 15 Jul 2020 12:45:05 +0530	[thread overview]
Message-ID: <20200715071506.10994-5-anup.patel@wdc.com> (raw)
In-Reply-To: <20200715071506.10994-1-anup.patel@wdc.com>

We add DT bindings documentation for CLINT device.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
---
 .../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..f5579a759ef5
--- /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,fu540-c000-clint
+      - const: sifive,clint0
+
+    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
+
+examples:
+  - |
+    clint@2000000 {
+      compatible = "sifive,clint0", "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


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