linux-kernel - [PATCH 2/4] arm64: dts: intel: agilex5: Add snps,dev-nack-retry-cnt property for I3C controllers

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Message-ID: <cd462b04f5ec5d425ff900823e596f193b373fc4.1762245890.git.adrianhoyin.ng@altera.com>
Date: Tue,  4 Nov 2025 16:51:09 +0800
From: adrianhoyin.ng@...era.com
To: alexandre.belloni@...tlin.com,
	Frank.Li@....com,
	wsa+renesas@...g-engineering.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dinguyen@...nel.org,
	linux-i3c@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: adrianhoyin.ng@...era.com
Subject: [PATCH 2/4] arm64: dts: intel: agilex5: Add snps,dev-nack-retry-cnt property for I3C controllers

From: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>

Add the 'snps,dev-nack-retry-cnt' property to the I3C controller nodes
on Agilex5. This configures the Device NACK Retry count for the Synopsys
DesignWare I3C master, allowing it to retry transactions once when a
slave responds with NACK.

Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
---
 arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi b/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
index 04e99cd7e74b..bb508d092fd6 100644
--- a/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
+++ b/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
@@ -209,6 +209,7 @@ i3c0: i3c@...a0000 {
 			#size-cells = <0>;
 			interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&clkmgr AGILEX5_L4_MP_CLK>;
+			snps,dev-nack-retry-cnt = <1>;
 			status = "disabled";
 		};
 
@@ -219,6 +220,7 @@ i3c1: i3c@...a1000 {
 			#size-cells = <0>;
 			interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&clkmgr AGILEX5_L4_MP_CLK>;
+			snps,dev-nack-retry-cnt = <1>;
 			status = "disabled";
 		};
 
-- 
2.49.GIT