hw-mgmt: scripts: Fix detection of PDB devices on Q3450 systems

On Q3450 systems PDB devices are part of switch boards, they do not
reside on separate boards as on other systems. Unlike switch board
VR devices, PDB devices on different switch boards have adjacent i2c
bus numbers, so using swb_brd_bus_offset parameter, which has value
of 32, does not work. Introduce swb_brd_pdb_bus_offset parameter to
describe the i2c bus number offset of PDB devices.

Bug: 4818028

Signed-off-by: Felix Radensky <fradensky@nvidia.com>

Author: felixradensky

usr/usr/bin/hw-management-devtree.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 ################################################################################
 # SPDX-FileCopyrightText: NVIDIA CORPORATION & AFFILIATES
-# Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2022-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -1214,6 +1214,7 @@ devtr_check_board_components()
 	local board_str=$1
 	local board_num=1
 	local board_bus_offset=0
+	local board_pdb_bus_offset=
 	local board_vr_num=
 	local board_pwr_conv_num=
 	local board_hotswap_num=
@@ -1261,6 +1262,9 @@ devtr_check_board_components()
 			if [ -e "$config_path"/swb_brd_bus_offset ]; then
 				board_bus_offset=$(< $config_path/swb_brd_bus_offset)
 			fi
+			if [ -e "$config_path"/swb_brd_pdb_bus_offset ]; then
+				board_pdb_bus_offset=$(< $config_path/swb_brd_pdb_bus_offset)
+			fi
 			if [ -e "$config_path"/swb_brd_vr_num ]; then
 				board_vr_num=$(< $config_path/swb_brd_vr_num)
 			fi
@@ -1537,7 +1541,11 @@ devtr_check_board_components()
 				for ((brd=0, n=1; brd<board_num; brd++, n++)) do
 					curr_component=(${board_alternatives[$alternative_key]})
 					if [ $board_bus_offset -ne 0 ]; then
-						curr_component[2]=$((curr_component[2]+board_bus_offset*brd))
+						if [ ! -z "$board_pdb_bus_offset" ]; then
+							curr_component[2]=$((curr_component[2]+board_pdb_bus_offset*brd))
+						else
+							curr_component[2]=$((curr_component[2]+board_bus_offset*brd))
+						fi
 					fi
 					if [ ! -z "${board_name_pfx}" ]; then
 						if [ -z "${board_pwr_conv_num}" ]; then
@@ -1583,7 +1591,11 @@ devtr_check_board_components()
 				for ((brd=0, n=1; brd<board_num; brd++, n++)) do
 					curr_component=(${board_alternatives[$alternative_key]})
 					if [ $board_bus_offset -ne 0 ]; then
-						curr_component[2]=$((curr_component[2]+board_bus_offset*brd))
+						if [ ! -z "$board_pdb_bus_offset" ]; then
+							curr_component[2]=$((curr_component[2]+board_pdb_bus_offset*brd))
+						else
+							curr_component[2]=$((curr_component[2]+board_bus_offset*brd))
+						fi
 					fi
 					if [ ! -z "${board_name_pfx}" ]; then
 						if [ -z "${board_hotswap_num}" ]; then

usr/usr/bin/hw-management.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 ################################################################################
 # SPDX-FileCopyrightText: NVIDIA CORPORATION & AFFILIATES
-# Copyright (c) 2018-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2018-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -3512,10 +3512,15 @@ pre_devtr_init()
 	VMOD0018)
 		cpu_bus_offset=$xdr_cpu_bus_offset
 		case $sku in
-		HI158|HI175|HI178)
+		HI158)
 			echo 2 > "$config_path"/swb_brd_num
 			echo 32 > "$config_path"/swb_brd_bus_offset
 			;;
+		HI175|HI178)
+			echo 2 > "$config_path"/swb_brd_num
+			echo 32 > "$config_path"/swb_brd_bus_offset
+			echo 1 > "$config_path"/swb_brd_pdb_bus_offset
+			;;
 		HI179)
 			echo 2 > "$config_path"/swb_brd_num
 			echo 32 > "$config_path"/swb_brd_bus_offset