diff options
Diffstat (limited to 'drivers/usb/common/common.c')
| -rw-r--r-- | drivers/usb/common/common.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c index b530fd403ffb..9e39286a4e5a 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"); |