linux-kernel - [PATCH 1/2] dt-bindings: riscv: Add optional DT property riscv,timer-always-on

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Message-Id: <20220719054729.2224766-2-apatel@ventanamicro.com>
Date:   Tue, 19 Jul 2022 11:17:28 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Samuel Holland <samuel@...lland.org>,
        Anup Patel <anup@...infault.org>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 1/2] dt-bindings: riscv: Add optional DT property riscv,timer-always-on

We add an optional DT property riscv,timer-always-on which if present
in CPU DT node then CPU timer is always powered-on and never loses
context.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 Documentation/devicetree/bindings/riscv/cpus.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
index d632ac76532e..33832b8dfaab 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -78,6 +78,12 @@ properties:
       - rv64imac
       - rv64imafdc
 
+  riscv,timer-always-on:
+    type: boolean
+    description:
+      If present, the timer is powered through an always-on power
+      domain, therefore it never loses context.
+
   # RISC-V requires 'timebase-frequency' in /cpus, so disallow it here
   timebase-frequency: false
 
-- 
2.34.1