linux-kernel - [PATCH 06/15] PCI/ACPI: Link host bridge to its ACPI fw node

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Date:   Wed, 31 Aug 2022 10:15:54 +0200
From:   Robert Richter <rrichter@....com>
To:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>, Robert Richter <rrichter@....com>,
        <linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: [PATCH 06/15] PCI/ACPI: Link host bridge to its ACPI fw node

A lookup of a host bridge's corresponding acpi device (struct
acpi_device) is not possible, for example:

	adev = ACPI_COMPANION(&host_bridge->dev);

This could be useful to find a host bridge's fwnode handle and to
determine and call additional host bridge ACPI parameters and methods
such as HID/CID or _UID.

Make this work by linking the host bridge to its ACPI fw node.

Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/acpi/pci_root.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index d57cf8454b93..846c979e4c29 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -1083,6 +1083,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 		goto out_release_info;
 
 	host_bridge = to_pci_host_bridge(bus->bridge);
+	host_bridge->dev.fwnode = acpi_fwnode_handle(device);
 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
 		host_bridge->native_pcie_hotplug = 0;
 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
-- 
2.30.2