[PATCH v2 01/25] fdtdec: Add API to read pci bus-range property

[Stefan Roese]

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>
Reviewed-by: Simon Glass <sjg at chromium.org>

Signed-off-by: Stefan Roese <sr at denx.de>
---

Changes in v2:
- Add Reviewed-by tag from Simon

Changes in v1:
- Add return value description to function prototype in header
- Changed from using be32_to_cpup() to fdt32_to_cpu()

 include/fdtdec.h | 13 +++++++++++++
 lib/fdtdec.c     | 16 ++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 760b392bdf..f6759c7f8e 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -444,6 +444,19 @@ int fdtdec_get_pci_vendev(const void *blob, int node,
 int fdtdec_get_pci_bar32(const 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
+ * @return 0 if ok, negative on error
+ */
+
+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 78576b530f..0b40fa374a 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -242,6 +242,22 @@ int fdtdec_get_pci_bar32(const 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 = fdt32_to_cpu(*values++);
+	res->end = fdt32_to_cpu(*values);
+
+	return 0;
+}
 #endif
 
 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
-- 
2.28.0