linux-kernel - [PATCH] ARM: dts: aspeed: santabarbara: Add swb cpld io expander

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Message-ID: <20260129073749.3155383-1-fredchen.openbmc@gmail.com>
Date: Thu, 29 Jan 2026 15:37:48 +0800
From: Fred Chen <fredchen.openbmc@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: aspeed: santabarbara: Add swb cpld io expander

Add CPLD-simulated IO expanders for cable presence detection and 4 SPI
flash control. To resolve sideband pin shortages, one IO expander is
utilized to aggregate interrupt signals.

Signed-off-by: Fred Chen <fredchen.openbmc@...il.com>
---
 .../aspeed-bmc-facebook-santabarbara.dts      | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-santabarbara.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-santabarbara.dts
index 0a3e2e241063..39f7fade8ff7 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-santabarbara.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-santabarbara.dts
@@ -1335,6 +1335,39 @@ eeprom@50 {
 &i2c12 {
 	status = "okay";
 
+	ioexp0: gpio@20 {
+		compatible = "nxp,pca9555";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		interrupt-parent = <&sgpiom0>;
+		interrupts = <148 IRQ_TYPE_LEVEL_LOW>;
+		gpio-line-names =
+			"IOEXP_21h_INT_N","","","",
+			"","","","",
+			"","","","",
+			"","","","";
+	};
+
+	gpio@21 {
+		compatible = "nxp,pca9555";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-parent = <&ioexp0>;
+		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+		gpio-line-names =
+			"PDB_PRSNT_J1_N","PDB_PRSNT_J2_N",
+			"PRSNT_NIC1_N","PRSNT_NIC2_N",
+			"PRSNT_NIC3_N","PRSNT_NIC4_N",
+			"SWB_PWR_FAULT_STATUS","",
+			"CBL_PRSNT_MCIO_0_N","CBL_PRSNT_MCIO_1_N",
+			"CBL_PRSNT_MCIO_2_N","CBL_PRSNT_MCIO_3_N",
+			"","","","";
+	};
+
 	gpio@27 {
 		compatible = "nxp,pca9555";
 		reg = <0x27>;
@@ -1349,6 +1382,21 @@ gpio@27 {
 			"SPI_MUX_SEL","","","";
 	};
 
+	gpio@28 {
+		compatible = "nxp,pca9555";
+		reg = <0x28>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names =
+			"SCO_UART_MUX_SEL0","SCO_UART_MUX_SEL1",
+			"SPI_PROG_PL12_SEL","SPI_PROG_PL34_SEL",
+			"","","","",
+			"I3C_HUB_3_MUX_SEL_PLD","",
+			"SPI_PROG_PL12_EN_N","SPI_PROG_PL34_EN_N",
+			"SCO1_SPI_SEL","SCO2_SPI_SEL",
+			"SCO3_SPI_SEL","SCO4_SPI_SEL";
+	};
+
 	// SWB FRU
 	eeprom@52 {
 		compatible = "atmel,24c64";
-- 
2.52.0