linux-kernel - [PATCH v2 4/6] arm64: dts: st: Use 128kB size for aliased GIC400 register access on stm32mp21 SoCs

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Message-ID: <20250415111654.2103767-5-christian.bruel@foss.st.com>
Date: Tue, 15 Apr 2025 13:16:52 +0200
From: Christian Bruel <christian.bruel@...s.st.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...s.st.com>
CC: <devicetree@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <maz@...nel.org>, Christian Bruel <christian.bruel@...s.st.com>
Subject: [PATCH v2 4/6] arm64: dts: st: Use 128kB size for aliased GIC400 register access on stm32mp21 SoCs

Adjust the size of 8kB GIC regions to 128kB so that each 4kB is mapped
16 times over a 64kB region.
The offset is then adjusted in the irq-gic driver.

see commit 12e14066f4835 ("irqchip/GIC: Add workaround for aliased GIC400")

Fixes: 7a57b1bb1afbf ("arm64: dts: st: introduce stm32mp21 SoCs family")
Signed-off-by: Christian Bruel <christian.bruel@...s.st.com>
Suggested-by: Marc Zyngier <maz@...nel.org>
---
 arch/arm64/boot/dts/st/stm32mp211.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/st/stm32mp211.dtsi b/arch/arm64/boot/dts/st/stm32mp211.dtsi
index 52a8209471b8..bf888d60cd4f 100644
--- a/arch/arm64/boot/dts/st/stm32mp211.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp211.dtsi
@@ -118,9 +118,9 @@ syscfg: syscon@...30000 {
 		intc: interrupt-controller@...10000 {
 			compatible = "arm,gic-400";
 			reg = <0x4ac10000 0x0 0x1000>,
-			      <0x4ac20000 0x0 0x2000>,
-			      <0x4ac40000 0x0 0x2000>,
-			      <0x4ac60000 0x0 0x2000>;
+			      <0x4ac20000 0x0 0x20000>,
+			      <0x4ac40000 0x0 0x20000>,
+			      <0x4ac60000 0x0 0x20000>;
 			      #interrupt-cells = <3>;
 			      interrupt-controller;
 		};
-- 
2.34.1