Check property of usb hardware to update otg version and disable SRP, HNP
and ADP if its disable flag is present.
Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/usb/common/common.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/of.h | 7 ++++++
2 files changed, 63 insertions(+)
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index b530fd4..9e39286 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -154,6 +154,62 @@ bool of_usb_host_tpl_support(struct device_node *np)
return false;
}
EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
+
+/**
+ * of_usb_update_otg_caps - to update usb otg capabilities according to
+ * the passed properties in DT.
+ * @np: Pointer to the given device_node
+ * @otg_caps: Pointer to the target usb_otg_caps to be set
+ *
+ * The function updates the otg capabilities
+ */
+int of_usb_update_otg_caps(struct device_node *np,
+ struct usb_otg_caps *otg_caps)
+{
+ u32 otg_rev;
+
+ if (!otg_caps)
+ return -EINVAL;
+
+ if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
+ switch (otg_rev) {
+ case 0x0100:
+ case 0x0120:
+ case 0x0130:
+ case 0x0200:
+ /* Choose the lesser one if it's already been set */
+ if (otg_caps->otg_rev)
+ otg_caps->otg_rev = min_t(u16, otg_rev,
+ otg_caps->otg_rev);
+ else
+ otg_caps->otg_rev = otg_rev;
+ break;
+ default:
+ pr_err("%s: unsupported otg-rev: 0x%x\n",
+ np->full_name, otg_rev);
+ return -EINVAL;
+ }
+ } else {
+ /*
+ * otg-rev is mandatory for otg properties, if not passed
+ * we set it to be 0 and assume it's a legacy otg device.
+ * Non-dt platform can set it afterwards.
+ */
+ otg_caps->otg_rev = 0;
+ }
+
+ if (of_find_property(np, "hnp-disable", NULL))
+ otg_caps->hnp_support = false;
+ if (of_find_property(np, "srp-disable", NULL))
+ otg_caps->srp_support = false;
+ if (of_find_property(np, "adp-disable", NULL) ||
+ (otg_caps->otg_rev < 0x0200))
+ otg_caps->adp_support = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
+
#endif
MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index cfe0528..8c5a818 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -15,6 +15,8 @@
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
bool of_usb_host_tpl_support(struct device_node *np);
+int of_usb_update_otg_caps(struct device_node *np,
+ struct usb_otg_caps *otg_caps);
#else
static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
{
@@ -30,6 +32,11 @@ static inline bool of_usb_host_tpl_support(struct device_node *np)
{
return false;
}
+static inline int of_usb_update_otg_caps(struct device_node *np,
+ struct usb_otg_caps *otg_caps)
+{
+ return 0;
+}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
--
1.9.1
--
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