Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-28 23:51:33 +00:00
Code Issues Projects Releases Packages Wiki Activity

usb: provide a device tree node to USB devices

Browse source 
It is possible to specify a device tree node for an USB device. This is
useful if you have a static USB setup and want to use aliases which
point to these nodes, like on the Raspberry Pi.
The nodes are matched against their hub port number, the compatible
strings are not matched for now.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Michael Walle 2020-06-02 01:47:07 +02:00 committed by Simon Glass
parent 77007f9543
commit c03b7612ea
3 changed files with 67 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
arch/sandbox/dts/test.dts
View file

@ -810,6 +810,8 @@
hub {
compatible = "usb-hub";
usb,device-class = <9>;
#address-cells = <1>;
#size-cells = <0>;
hub-emul {
compatible = "sandbox,usb-hub";
#address-cells = <1>;
@ -838,6 +840,13 @@
};
};
usbstor@1 {
reg = <1>;
};
usbstor@3 {
reg = <3>;
};
};
};

41
drivers/usb/host/usb-uclass.c
View file

@ -494,6 +494,35 @@ static int usb_match_one_id(struct usb_device_descriptor *desc,
return usb_match_one_id_intf(desc, int_desc, id);
}
static ofnode usb_get_ofnode(struct udevice *hub, int port)
{
ofnode node;
u32 reg;
if (!dev_has_of_node(hub))
return ofnode_null();
/*
* The USB controller and its USB hub are two different udevices,
* but the device tree has only one node for both. Thus we are
* assigning this node to both udevices.
* If port is zero, the controller scans its root hub, thus we
* are using the same ofnode as the controller here.
*/
if (!port)
return dev_ofnode(hub);
ofnode_for_each_subnode(node, dev_ofnode(hub)) {
if (ofnode_read_u32(node, "reg", &reg))
continue;
if (reg == port)
return node;
}
return ofnode_null();
}
/**
* usb_find_and_bind_driver() - Find and bind the right USB driver
*
@ -502,13 +531,14 @@ static int usb_match_one_id(struct usb_device_descriptor *desc,
static int usb_find_and_bind_driver(struct udevice *parent,
struct usb_device_descriptor *desc,
struct usb_interface_descriptor *iface,
int bus_seq, int devnum,
int bus_seq, int devnum, int port,
struct udevice **devp)
{
struct usb_driver_entry *start, *entry;
int n_ents;
int ret;
char name[30], *str;
ofnode node = usb_get_ofnode(parent, port);
*devp = NULL;
debug("%s: Searching for driver\n", __func__);
@ -533,8 +563,8 @@ static int usb_find_and_bind_driver(struct udevice *parent,
* find another driver. For now this doesn't seem
* necesssary, so just bind the first match.
*/
ret = device_bind(parent, drv, drv->name, NULL, -1,
&dev);
ret = device_bind_ofnode(parent, drv, drv->name, NULL,
node, &dev);
if (ret)
goto error;
debug("%s: Match found: %s\n", __func__, drv->name);
@ -651,9 +681,10 @@ int usb_scan_device(struct udevice *parent, int port,
if (ret) {
if (ret != -ENOENT)
return ret;
ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
ret = usb_find_and_bind_driver(parent, &udev->descriptor,
iface,
udev->controller_dev->seq,
udev->devnum, &dev);
udev->devnum, port, &dev);
if (ret)
return ret;
created = true;

22
test/dm/usb.c
View file

@ -78,6 +78,28 @@ static int dm_test_usb_multi(struct unit_test_state *uts)
}
DM_TEST(dm_test_usb_multi, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* test that we have an associated ofnode with the usb device */
static int dm_test_usb_fdt_node(struct unit_test_state *uts)
{
struct udevice *dev;
ofnode node;
state_set_skip_delays(true);
ut_assertok(usb_init());
ut_assertok(uclass_get_device(UCLASS_MASS_STORAGE, 0, &dev));
node = ofnode_path("/usb@1/hub/usbstor@1");
ut_asserteq(1, ofnode_equal(node, dev_ofnode(dev)));
ut_assertok(uclass_get_device(UCLASS_MASS_STORAGE, 1, &dev));
ut_asserteq(1, ofnode_equal(ofnode_null(), dev_ofnode(dev)));
ut_assertok(uclass_get_device(UCLASS_MASS_STORAGE, 2, &dev));
node = ofnode_path("/usb@1/hub/usbstor@3");
ut_asserteq(1, ofnode_equal(node, dev_ofnode(dev)));
ut_assertok(usb_stop());
return 0;
}
DM_TEST(dm_test_usb_fdt_node, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
static int count_usb_devices(void)
{
struct udevice *hub;