From: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Guo Ren <guoren@linux.alibaba.com>, Bin Meng <bmeng.cn@gmail.com>,
Xiang W <wxjstz@126.com>, Samuel Holland <samuel@sholland.org>,
Atish Patra <atish.patra@wdc.com>,
Rob Herring <robh+dt@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Anup Patel <anup.patel@wdc.com>,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
linux-riscv@lists.infradead.org, opensbi@lists.infradead.org,
Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Subject: [PATCH v2 1/1] dt-bindings: reg-io-width for SiFive CLINT
Date: Fri, 15 Oct 2021 14:07:35 +0200 [thread overview]
Message-ID: <20211015120735.27972-1-heinrich.schuchardt@canonical.com> (raw)
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@canonical.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
next reply other threads:[~2021-10-15 12:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-15 12:07 Heinrich Schuchardt [this message]
2021-10-18 4:33 ` [PATCH v2 1/1] dt-bindings: reg-io-width for SiFive CLINT Anup Patel
2021-10-18 7:30 ` Heinrich Schuchardt
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