linux-kernel - [PATCH 2/3] PCI: of: Simplify bus range parsing

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Message-Id: <20250103213129.5182-3-helgaas@kernel.org>
Date: Fri,  3 Jan 2025 15:31:28 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: "David S . Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>,
	sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 2/3] PCI: of: Simplify bus range parsing

From: Bjorn Helgaas <bhelgaas@...gle.com>

of_pci_parse_bus_range() looks for a DT "bus-range" property.  If none
exists, devm_of_pci_get_host_bridge_resources() defaults to the [bus 00-ff]
range supplied by its caller, pci_parse_request_of_pci_ranges().

devm_of_pci_get_host_bridge_resources() is static and has no other callers,
so there's no reason to complicate its interface by passing the default bus
range.

Drop the busno and bus_max parameters and use 0x0 and 0xff directly in
devm_of_pci_get_host_bridge_resources().

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/of.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 2f579b691f8e..02cba51e4ca4 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -302,8 +302,6 @@ EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
  * devm_of_pci_get_host_bridge_resources() - Resource-managed parsing of PCI
  *                                           host bridge resources from DT
  * @dev: host bridge device
- * @busno: bus number associated with the bridge root bus
- * @bus_max: maximum number of buses for this bridge
  * @resources: list where the range of resources will be added after DT parsing
  * @ib_resources: list where the range of inbound resources (with addresses
  *                from 'dma-ranges') will be added after DT parsing
@@ -319,7 +317,6 @@ EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
  * value if it failed.
  */
 static int devm_of_pci_get_host_bridge_resources(struct device *dev,
-			unsigned char busno, unsigned char bus_max,
 			struct list_head *resources,
 			struct list_head *ib_resources,
 			resource_size_t *io_base)
@@ -343,8 +340,8 @@ static int devm_of_pci_get_host_bridge_resources(struct device *dev,
 
 	err = of_pci_parse_bus_range(dev_node, bus_range);
 	if (err) {
-		bus_range->start = busno;
-		bus_range->end = bus_max;
+		bus_range->start = 0;
+		bus_range->end = 0xff;
 		bus_range->flags = IORESOURCE_BUS;
 		dev_info(dev, "  No bus range found for %pOF, using %pR\n",
 			 dev_node, bus_range);
@@ -597,7 +594,7 @@ static int pci_parse_request_of_pci_ranges(struct device *dev,
 	INIT_LIST_HEAD(&bridge->windows);
 	INIT_LIST_HEAD(&bridge->dma_ranges);
 
-	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &bridge->windows,
+	err = devm_of_pci_get_host_bridge_resources(dev, &bridge->windows,
 						    &bridge->dma_ranges, &iobase);
 	if (err)
 		return err;
-- 
2.34.1