linux-kernel - [PATCH v4 6/7] ARM: dts: aspeed: yosemite5: Add PDB IO expander

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Message-Id: <20260130-yv5_revise_dts-v4-6-4d924455f3a7@gmail.com>
Date: Fri, 30 Jan 2026 16:20:14 +0800
From: Kevin Tung <kevin.tung.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>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Amithash Prasasd <amithash@...a.com>, Kevin Tung <Kevin.Tung@...ntatw.com>, 
 Ken Chen <Ken.Chen@...ntatw.com>, Leo Yang <Leo-Yang@...ntatw.com>, 
 Jackson Liu <Jackson.Liu@...ntatw.com>, 
 Kevin Tung <kevin.tung.openbmc@...il.com>
Subject: [PATCH v4 6/7] ARM: dts: aspeed: yosemite5: Add PDB IO expander

The new hardware design adds an IO expander on the PDB to support
fan presence detection and HSC fault monitoring. So Add the PDB
IO expander device node to the DTS.

The IO expander interrupt is connected to SGPIO92, which was
previously named ALERT_PADDLE2_SMB_N and not used by the system.
This pin is now repurposed and renamed to FM_IOE_ALT_N to reflect
its function as the PDB IO expander interrupt.

Signed-off-by: Kevin Tung <kevin.tung.openbmc@...il.com>
---
 .../dts/aspeed/aspeed-bmc-facebook-yosemite5.dts    | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
index 524597a81365ef10cd03b67d35eeb88a965cbe0a..48f864b52d1a22b12f8a39ba9703a90349ed930d 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
@@ -389,6 +389,25 @@ adc@1d {
 		ti,mode = /bits/ 8 <1>;
 	};
 
+	/* PDB IOEXP */
+	gpio-expander@24 {
+		compatible = "nxp,pca9555";
+		reg = <0x24>;
+		interrupt-parent = <&sgpiom0>;
+		interrupts = <92 IRQ_TYPE_LEVEL_LOW>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names =
+			"FM_P52V_AUX_FLT_N", "FM_P12V_AUX_PWRGD",
+			"FM_SLOTX_HSC_FAULT_N_FF", "",
+			"","",
+			"","",
+			"PRSNT_FAN0","PRSNT_FAN1",
+			"PRSNT_FAN2","PRSNT_FAN3",
+			"","",
+			"","";
+	};
+
 	power-sensor@40 {
 		compatible = "ti,ina238";
 		reg = <0x40>;
@@ -937,7 +956,7 @@ &sgpiom0 {
 	"ALERT_OC_PADDLE2_N","",
 	"ALERT_OC_PWR2_N","",
 	"ALERT_OC_PWR11_N","",
-	"ALERT_PADDLE2_SMB_N","",
+	"FM_IOE_ALT_N","",
 	"ALERT_PWR14_SB2_LEAK_DETECT_N","",
 	/*bit48-bit55*/
 	"ALERT_PWR14_SB3_LEAK_DETECT_N","",

-- 
2.52.0