linux-kernel - [PATCH v2 1/1] dt-bindings: reg-io-width for SiFive CLINT

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Message-Id: <20211015120735.27972-1-heinrich.schuchardt@canonical.com>
Date:   Fri, 15 Oct 2021 14:07:35 +0200
From:   Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Guo Ren <guoren@...ux.alibaba.com>, Bin Meng <bmeng.cn@...il.com>,
        Xiang W <wxjstz@....com>, Samuel Holland <samuel@...lland.org>,
        Atish Patra <atish.patra@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup.patel@....com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        opensbi@...ts.infradead.org,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Subject: [PATCH v2 1/1] dt-bindings: reg-io-width for SiFive CLINT

The CLINT in the T-HEAD 9xx processors do not support 64bit mmio access to
the MTIMER device. The current schema does not allow to specify this.

OpenSBI currently uses a property 'clint,has-no-64bit-mmio' to indicate the
restriction. Samuael Holland suggested in
lib: utils/timer: Use standard property to specify 32-bit I/O
https://github.com/smaeul/opensbi/commit/b95e9cf7cf93b0af16fc89204378bc59ff30008e
to use "reg-io-width = <4>;" as the reg-io-width property is generally used
in the devicetree schema for such a condition.

A release candidate of the ACLINT specification is available at
https://github.com/riscv/riscv-aclint/releases

Add reg-io-width as optional property to the SiFive Core Local Interruptor.
Add a new compatible string "allwinner,sun20i-d1-clint" for the CLINT of
the Allwinner D1 SoC.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
---
 .../devicetree/bindings/timer/sifive,clint.yaml     | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
index a35952f48742..d3b4c6844e2f 100644
--- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
+++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
@@ -26,6 +26,7 @@ properties:
       - enum:
           - sifive,fu540-c000-clint
           - canaan,k210-clint
+          - allwinner,sun20i-d1-clint
       - const: sifive,clint0
 
     description:
@@ -33,14 +34,22 @@ properties:
       Supported compatible strings are -
       "sifive,fu540-c000-clint" for the SiFive CLINT v0 as integrated
       onto the SiFive FU540 chip, "canaan,k210-clint" for the SiFive
-      CLINT v0 as integrated onto the Canaan Kendryte K210 chip, and
-      "sifive,clint0" for the SiFive CLINT v0 IP block with no chip
+      CLINT v0 as integrated onto the Canaan Kendryte K210 chip,
+      "allwinner,sun20i-d1-clint" for the CLINT in the Allwinner D1 SoC,
+      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
 
+  reg-io-width:
+    description: |
+      Some CLINT implementations, e.g. on the T-HEAD 9xx, only support
+      32bit access for MTIMER.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    const: 4
+
   interrupts-extended:
     minItems: 1
 
-- 
2.32.0