[U-Boot] [RFC PATCH 03/29] fdtdec: add API to read pci bus-range property

[Suneel Garapati]

From: Suneel Garapati <sgarapati at marvell.com>

Add fdtdec_get_pci_bus_range to read bus-range property
values.

Signed-off-by: Suneel Garapati <sgarapati at marvell.com>
---
 include/fdtdec.h | 12 ++++++++++++
 lib/fdtdec.c     | 16 ++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/fdtdec.h b/include/fdtdec.h
index f1e58f9732..afbd22b25a 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -441,6 +441,18 @@ int fdtdec_get_pci_vendev(const void *blob, int node,
 int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
 			 u32 *bar);
 
+/**
+ * Look at the bus range property of a device node and return the pci bus
+ * range for this node.
+ * The property must hold one fdt_pci_addr with a length.
+ * @param blob		FDT blob
+ * @param node		node to examine
+ * @param res		the resource structure to return the bus range
+ */
+
+int fdtdec_get_pci_bus_range(const void *blob, int node,
+			     struct fdt_resource *res);
+
 /**
  * Look up a 32-bit integer property in a node and return it. The property
  * must have at least 4 bytes of data. The value of the first cell is
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 17736ce665..fb61eda1fd 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -237,6 +237,22 @@ int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
 
 	return 0;
 }
+
+int fdtdec_get_pci_bus_range(const void *blob, int node,
+			     struct fdt_resource *res)
+{
+	const u32 *values;
+	int len;
+
+	values = fdt_getprop(blob, node, "bus-range", &len);
+	if (!values || len < sizeof(*values) * 2)
+		return -EINVAL;
+
+	res->start = be32_to_cpup(values++);
+	res->end = be32_to_cpup(values);
+
+	return 0;
+}
 #endif
 
 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
-- 
2.23.0