linux-kernel - [PATCH 2/4] arm64: dts: socfpga: stratix10: Add 4-bit SPI bus width

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Message-Id: <c1631f5b1d4088a3422f4ea0068edd8d7ca2eb93.1750747163.git.yan.kei.fong@altera.com>
Date: Tue, 24 Jun 2025 14:52:26 +0800
From: yankei.fong@...era.com
To: Dinh Nguyen <dinguyen@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-kernel@...r.kernel.org (open list),
	Matthew Gerlach <matthew.gerlach@...era.com>
Subject: [PATCH 2/4] arm64: dts: socfpga: stratix10: Add 4-bit SPI bus width

From: "Fong, Yan Kei" <yan.kei.fong@...era.com>

Add spi-tx-bus-width and spi-rx-bus-width properties with
value 4 to the stratix10 device tree.
This update configures the SPI controller to use a 4-bit
bus width for both transmission and reception,
potentially improving SPI throughput and
matching the hardware capabilities more closely.

Signed-off-by: Fong, Yan Kei <yan.kei.fong@...era.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@...era.com>
---
 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
index 4eee777ef1a1..6ff6ea0c6b2d 100644
--- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
+++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
@@ -190,6 +190,8 @@ flash@0 {
 		cdns,tsd2d-ns = <50>;
 		cdns,tchsh-ns = <4>;
 		cdns,tslch-ns = <4>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
 
 		partitions {
 			compatible = "fixed-partitions";
-- 
2.25.1