linux-kernel - [PATCH v4 1/2] dt-bindings: timer: mti,gcru

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250514-riscv-time-mmio-v4-1-cb0cf2922d66@htecgroup.com>
Date: Wed, 14 May 2025 10:51:50 +0200
From: Aleksa Paunovic via B4 Relay <devnull+aleksa.paunovic.htecgroup.com@...nel.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, 
 Djordje Todorovic <djordje.todorovic@...cgroup.com>, 
 Aleksa Paunovic <aleksa.paunovic@...cgroup.com>
Subject: [PATCH v4 1/2] dt-bindings: timer: mti,gcru

From: Aleksa Paunovic <aleksa.paunovic@...cgroup.com>

Add dt-bindings for the GCR.U memory mapped timer device for RISC-V
platforms. The GCR.U memory region contains shadow copies of the RISC-V
mtime register and the hrtime Global Configuration Register.

Signed-off-by: Aleksa Paunovic <aleksa.paunovic@...cgroup.com>
---
 .../devicetree/bindings/timer/mti,gcru.yaml        | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/Documentation/devicetree/bindings/timer/mti,gcru.yaml b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..ceaf90bad5332b64f3c1f28bebdc28d78443898a
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/mti,gcru.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/mti,gcru.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GCR.U timer device for RISC-V platforms
+
+maintainers:
+  - Aleksa Paunovic <aleksa.paunovic@...cgroup.com>
+
+description:
+  The GCR.U memory region contains memory mapped shadow copies of
+  mtime and hrtime Global Configuration Registers,
+  which software can choose to make accessible from user mode.
+
+properties:
+  compatible:
+    const: mti,gcru
+
+  reg:
+    items:
+      - description: Read-only shadow copy of the RISC-V mtime register.
+      - description: Read-only shadow copy of the high resolution timer register.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    timer@...7f000 {
+        compatible = "mti,gcru";
+        reg = <0x1617f050 0x8>,
+              <0x1617f090 0x8>;
+    };

-- 
2.34.1