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

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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>
This commit is contained in:
Stefan Roese 2020-08-05 13:56:11 +02:00
parent 1db7ee464f
commit 68f81b8575
2 changed files with 29 additions and 0 deletions
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17
drivers/core/read.c
View file

@ -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;
}

12
include/dm/read.h
View file

@ -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,