dm: core: Add API to read PCI bus-range property

Add dev_read_pci_bus_range() to read bus-range property values

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

diff --git a/drivers/core/read.c b/drivers/core/read.c
index 8bb456b..86f3f88 100644 (file)
--- 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 0a7aacd..67db94a 100644 (file)
--- 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,