[PATCH 3/9] of: address: Add device type pci-ep

[Frank Li <Frank.Li@nxp.com>]

The PCI bus device tree supports 'ranges' properties that indicate how to
convert PCI addresses to CPU addresses. Many PCI controllers are dual-role
controllers, supporting both Root Complex (RC) and Endpoint (EP) modes. The
EP side also needs similar information for proper address translation.

Add device type 'pci-ep' and use the same PCI address parser function to
parser PCI EP's ranges property.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/of/address.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index d886f16df8a6e..c98e212d53dc1 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -117,13 +117,13 @@ static int of_bus_default_flags_translate(__be32 *addr, u64 offset, int na)
 	return of_bus_default_translate(addr + 1, offset, na - 1);
 }
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) || defined(CONFIG_PCI_ENDPOINT)
 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
 {
 	unsigned int flags = 0;
 	u32 w = be32_to_cpup(addr);
 
-	if (!IS_ENABLED(CONFIG_PCI))
+	if (!IS_ENABLED(CONFIG_PCI) && !IS_ENABLED(CONFIG_PCI_ENDPOINT))
 		return 0;
 
 	switch((w >> 24) & 0x03) {
@@ -172,6 +172,11 @@ static int of_bus_pci_match(struct device_node *np)
 		of_node_is_pcie(np, "pcie");
 }
 
+static int of_bus_pci_ep_match(struct device_node *np)
+{
+	return of_node_is_type(np, "pci-ep") || of_node_is_pcie(np, "pcie-ep");
+}
+
 static void of_bus_pci_count_cells(struct device_node *np,
 				   int *addrc, int *sizec)
 {
@@ -196,7 +201,7 @@ static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
 	return of_bus_default_map(addr, range, na, ns, pna, fna);
 }
 
-#endif /* CONFIG_PCI */
+#endif /* CONFIG_PCI || CONFIG_PCI_ENDPOINT */
 
 static int __of_address_resource_bounds(struct resource *r, u64 start, u64 size)
 {
@@ -354,6 +359,19 @@ static struct of_bus of_busses[] = {
 		.get_flags = of_bus_pci_get_flags,
 	},
 #endif /* CONFIG_PCI */
+#ifdef CONFIG_PCI_ENDPOINT
+	/* PCI Endpoint */
+	{
+		.name = "pci-ep",
+		.addresses = "assigned-addresses",
+		.match = of_bus_pci_ep_match,
+		.count_cells = of_bus_pci_count_cells,
+		.map = of_bus_pci_map,
+		.translate = of_bus_default_flags_translate,
+		.flag_cells = 1,
+		.get_flags = of_bus_pci_get_flags,
+	},
+#endif /* CONFIG_PCI_EP */
 	/* ISA */
 	{
 		.name = "isa",

-- 
2.34.1