[PATCH v2 02/25] dm: core: Add API to read PCI bus-range property

[Stefan Roese]

Add dev_read_pci_bus_range() to read bus-range property values

Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Simon Glass <sjg at chromium.org>

---

Changes in v2:
- New patch

 drivers/core/read.c | 17 +++++++++++++++++
 include/dm/read.h   | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/core/read.c b/drivers/core/read.c
index 8bb456bc3f..86f3f88170 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -10,6 +10,7 @@
 #include <mapmem.h>
 #include <asm/types.h>
 #include <asm/io.h>
+#include <linux/ioport.h>
 
 int dev_read_u32(const struct udevice *dev, const char *propname, u32 *outp)
 {
@@ -359,3 +360,19 @@ int dev_get_child_count(const struct udevice *dev)
 {
 	return ofnode_get_child_count(dev_ofnode(dev));
 }
+
+int dev_read_pci_bus_range(const struct udevice *dev,
+			   struct resource *res)
+{
+	const u32 *values;
+	int len;
+
+	values = dev_read_prop(dev, "bus-range", &len);
+	if (!values || len < sizeof(*values) * 2)
+		return -EINVAL;
+
+	res->start = *values++;
+	res->end = *values;
+
+	return 0;
+}
diff --git a/include/dm/read.h b/include/dm/read.h
index 487ec9e9c9..ac7ec5dd79 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -680,6 +680,18 @@ int dev_read_alias_highest_id(const char *stem);
  */
 int dev_get_child_count(const struct udevice *dev);
 
+/**
+ * dev_read_pci_bus_range - Read PCI bus-range resource
+ *
+ * Look at the bus range property of a device node and return the pci bus
+ * range for this node.
+ *
+ * @dev: device to examine
+ * @res returns the resource
+ * @return 0 if ok, negative on error
+ */
+int dev_read_pci_bus_range(const struct udevice *dev, struct resource *res);
+
 #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
 
 static inline int dev_read_u32(const struct udevice *dev,
-- 
2.28.0