Parse usb-pwrseq property from Device Tree to get the phandle to pwrseq
device. The pwrseq device will be used by USB hub to cycle the power
before activating ports.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
---
drivers/usb/core/hub.h | 3 +++
drivers/usb/core/port.c | 15 +++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 34c1a7e22aae..68ca89780d26 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -24,6 +24,8 @@
#include <linux/usb/hcd.h>
#include "usb.h"
+struct pwrseq;
+
struct usb_hub {
struct device *intfdev; /* the "interface" device */
struct usb_device *hdev;
@@ -101,6 +103,7 @@ struct usb_port {
struct usb_dev_state *port_owner;
struct usb_port *peer;
struct dev_pm_qos_request *req;
+ struct pwrseq *pwrseq;
enum usb_port_connect_type connect_type;
usb_port_location_t location;
struct mutex status_lock;
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 14718a9ffcfb..a875bd342452 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -18,6 +18,8 @@
#include <linux/slab.h>
#include <linux/pm_qos.h>
+#include <linux/pwrseq.h>
+#include <linux/usb/of.h>
#include "hub.h"
@@ -532,6 +534,14 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
return retval;
}
+ port_dev->dev.of_node = usb_of_get_child_node(hub->hdev->dev.of_node, port1);
+ port_dev->pwrseq = pwrseq_alloc(&port_dev->dev);
+ if (IS_ERR(port_dev->pwrseq)) {
+ device_unregister(&port_dev->dev);
+ /* TODO: what about EPROBE_DEFER? */
+ return PTR_ERR(port_dev->pwrseq);
+ }
+
find_and_link_peer(hub, port1);
/*
@@ -573,8 +583,13 @@ void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
struct usb_port *port_dev = hub->ports[port1 - 1];
struct usb_port *peer;
+ pwrseq_power_off(port_dev->pwrseq);
+
peer = port_dev->peer;
if (peer)
unlink_peers(port_dev, peer);
+
+ pwrseq_free(port_dev->pwrseq);
+ port_dev->pwrseq = NULL;
device_unregister(&port_dev->dev);
}
--
1.9.1
--
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