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usb: of: add functions to bind a companion controller

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EHCI controllers will have a companion controller. However, on platform
bus, there was difficult to bind them in previous code. So, this
patch adds helper functions to bind them using a "companion" property.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2017-02-21 19:59:47 +09:00 committed by Greg Kroah-Hartman
parent cfd6ed4537
commit 5095cb89c6
3 changed files with 29 additions and 0 deletions
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1
Documentation/devicetree/bindings/usb/generic.txt
View File

@ -22,6 +22,7 @@ Optional properties:
property is used if any real OTG features(HNP/SRP/ADP)
is enabled, if ADP is required, otg-rev should be
0x0200 or above.
- companion: phandle of a companion
- hnp-disable: tells OTG controllers we want to disable OTG HNP, normally HNP
is the basic function of real OTG except you want it
to be a srp-capable only B device.

23
drivers/usb/core/of.c
View File

@ -18,6 +18,7 @@
*/
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/usb/of.h>
/**
@ -46,3 +47,25 @@ struct device_node *usb_of_get_child_node(struct device_node *parent,
}
EXPORT_SYMBOL_GPL(usb_of_get_child_node);
/**
* usb_of_get_companion_dev - Find the companion device
* @dev: the device pointer to find a companion
*
* Find the companion device from platform bus.
*
* Return: On success, a pointer to the companion device, %NULL on failure.
*/
struct device *usb_of_get_companion_dev(struct device *dev)
{
struct device_node *node;
struct platform_device *pdev = NULL;
node = of_parse_phandle(dev->of_node, "companion", 0);
if (node)
pdev = of_find_device_by_node(node);
of_node_put(node);
return pdev ? &pdev->dev : NULL;
}
EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);

5
include/linux/usb/of.h
View File

@ -18,6 +18,7 @@ int of_usb_update_otg_caps(struct device_node *np,
struct usb_otg_caps *otg_caps);
struct device_node *usb_of_get_child_node(struct device_node *parent,
int portnum);
struct device *usb_of_get_companion_dev(struct device *dev);
#else
static inline enum usb_dr_mode
of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0)
@ -38,6 +39,10 @@ static inline struct device_node *usb_of_get_child_node
{
return NULL;
}
static inline struct device *usb_of_get_companion_dev(struct device *dev)
{
return NULL;
}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)