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author | Kishon Vijay Abraham I <kishon@ti.com> | 2013-01-25 08:03:25 +0530 |
---|---|---|
committer | Felipe Balbi <balbi@ti.com> | 2013-01-25 10:20:14 +0200 |
commit | 5d3c28b5a42df5ceaa854901ba2cccb76883c77e (patch) | |
tree | ae1e50d90d5ce1e5925dd552971224f775b574f3 /drivers/usb/otg | |
parent | 0fa4fab4ee46470ccd463c83be95434936942e05 (diff) | |
download | linux-stable-5d3c28b5a42df5ceaa854901ba2cccb76883c77e.tar.gz linux-stable-5d3c28b5a42df5ceaa854901ba2cccb76883c77e.tar.bz2 linux-stable-5d3c28b5a42df5ceaa854901ba2cccb76883c77e.zip |
usb: otg: add device tree support to otg library
Added an API devm_usb_get_phy_by_phandle(), to get usb phy by passing a
device node phandle value. This function will return a pointer to
the phy on success, -EPROBE_DEFER if there is a device_node for the phandle,
but the phy has not been added, or a ERR_PTR() otherwise.
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/otg')
-rw-r--r-- | drivers/usb/otg/otg.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c index 4bb4333c9653..e1814397ca3a 100644 --- a/drivers/usb/otg/otg.c +++ b/drivers/usb/otg/otg.c @@ -13,7 +13,9 @@ #include <linux/export.h> #include <linux/err.h> #include <linux/device.h> +#include <linux/module.h> #include <linux/slab.h> +#include <linux/of.h> #include <linux/usb/otg.h> @@ -54,6 +56,20 @@ static struct usb_phy *__usb_find_phy_dev(struct device *dev, return ERR_PTR(-ENODEV); } +static struct usb_phy *__of_usb_find_phy(struct device_node *node) +{ + struct usb_phy *phy; + + list_for_each_entry(phy, &phy_list, head) { + if (node != phy->dev->of_node) + continue; + + return phy; + } + + return ERR_PTR(-ENODEV); +} + static void devm_usb_phy_release(struct device *dev, void *res) { struct usb_phy *phy = *(struct usb_phy **)res; @@ -129,6 +145,70 @@ err0: } EXPORT_SYMBOL(usb_get_phy); + /** + * devm_usb_get_phy_by_phandle - find the USB PHY by phandle + * @dev - device that requests this phy + * @phandle - name of the property holding the phy phandle value + * @index - the index of the phy + * + * Returns the phy driver associated with the given phandle value, + * after getting a refcount to it, -ENODEV if there is no such phy or + * -EPROBE_DEFER if there is a phandle to the phy, but the device is + * not yet loaded. While at that, it also associates the device with + * the phy using devres. On driver detach, release function is invoked + * on the devres data, then, devres data is freed. + * + * For use by USB host and peripheral drivers. + */ +struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, + const char *phandle, u8 index) +{ + struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr; + unsigned long flags; + struct device_node *node; + + if (!dev->of_node) { + dev_dbg(dev, "device does not have a device node entry\n"); + return ERR_PTR(-EINVAL); + } + + node = of_parse_phandle(dev->of_node, phandle, index); + if (!node) { + dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle, + dev->of_node->full_name); + return ERR_PTR(-ENODEV); + } + + ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) { + dev_dbg(dev, "failed to allocate memory for devres\n"); + goto err0; + } + + spin_lock_irqsave(&phy_lock, flags); + + phy = __of_usb_find_phy(node); + if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { + phy = ERR_PTR(-EPROBE_DEFER); + devres_free(ptr); + goto err1; + } + + *ptr = phy; + devres_add(dev, ptr); + + get_device(phy->dev); + +err1: + spin_unlock_irqrestore(&phy_lock, flags); + +err0: + of_node_put(node); + + return phy; +} +EXPORT_SYMBOL(devm_usb_get_phy_by_phandle); + /** * usb_get_phy_dev - find the USB PHY * @dev - device that requests this phy |