[PATCH v4 07/23] usb: common: add API to get usb otg features from device tree
From: Li Jun <hidden>
Date: 2015-06-17 05:43:39
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
Possibly related (same subject, not in this thread)
- 2015-06-17 · Re: [PATCH v4 07/23] usb: common: add API to get usb otg features from device tree · Li Jun <hidden>
- 2015-06-17 · Re: [PATCH v4 07/23] usb: common: add API to get usb otg features from device tree · Roger Quadros <hidden>
Check property of usb hardware to get otg version and if SRP, HNP and ADP are supported. Signed-off-by: Li Jun <redacted> --- drivers/usb/common/common.c | 29 +++++++++++++++++++++++++++++ include/linux/usb/of.h | 7 +++++++ 2 files changed, 36 insertions(+)
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index b530fd4..b846172 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c@@ -154,6 +154,35 @@ bool of_usb_host_tpl_support(struct device_node *np) return false; } EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); + +/** + * of_usb_get_otg_caps - to get 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 gets and sets the otg capabilities + */ +void of_usb_get_otg_caps(struct device_node *np, struct usb_otg_caps *otg_caps) +{ + u32 otg_rev; + + if (!otg_caps) + return; + + if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { + otg_caps->otg_rev = otg_rev; + if (!of_find_property(np, "hnp-disable", NULL)) + otg_caps->hnp_support = true; + if (!of_find_property(np, "srp-disable", NULL)) + otg_caps->hnp_support = true; + if (!of_find_property(np, "adp-disable", NULL) && + (otg_caps->otg_rev >= 0x0200)) + otg_caps->hnp_support = true; + } +} +EXPORT_SYMBOL_GPL(of_usb_get_otg_caps); + #endif MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index cfe0528..bbf302b9 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); +void of_usb_get_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 void of_usb_get_otg_caps(struct device_node *np, + struct usb_otg_caps *otg_caps) +{ + +} #endif #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
--
1.9.1
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