Re: [RFC PATCH 5/6] usb: otg: add device tree support to otg library
On 01/16/2013 05:01 PM, Kishon Vijay Abraham I wrote: 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 m...@pengutronix.de Signed-off-by: Kishon Vijay Abraham I kis...@ti.com --- drivers/usb/otg/otg.c | 77 +++ include/linux/usb/phy.h |8 + 2 files changed, 85 insertions(+) diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c index dbf2043..e9799bb 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 @@ -34,6 +36,20 @@ static struct usb_phy *__usb_find_phy(struct device *dev, u8 index) 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; @@ -109,6 +125,67 @@ 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 = NULL, **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); + return ERR_PTR(-ENOMEM); + } I fail to understand why you need ptr at all and why do devres_alloc() for it. + + 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 err0; + } + + *ptr = phy; + devres_add(dev, ptr); + + get_device(phy-dev); + +err0: + spin_unlock_irqrestore(phy_lock, flags); + + return phy; +} +EXPORT_SYMBOL(devm_usb_get_phy_by_phandle); + -- cheers, -roger -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [RFC PATCH 5/6] usb: otg: add device tree support to otg library
On Monday 21 January 2013 06:51 PM, Roger Quadros wrote: On 01/16/2013 05:01 PM, Kishon Vijay Abraham I wrote: 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 m...@pengutronix.de Signed-off-by: Kishon Vijay Abraham I kis...@ti.com --- drivers/usb/otg/otg.c | 77 +++ include/linux/usb/phy.h |8 + 2 files changed, 85 insertions(+) diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c index dbf2043..e9799bb 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 @@ -34,6 +36,20 @@ static struct usb_phy *__usb_find_phy(struct device *dev, u8 index) 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; @@ -109,6 +125,67 @@ 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 = NULL, **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); + return ERR_PTR(-ENOMEM); + } I fail to understand why you need ptr at all and why do devres_alloc() for it. Thats how we create a managed device resource. You can have a look at Documentation/driver-model/devres.txt and drivers/base/devres.c. I'm not sure if that is what you are looking for :-P Thanks Kishon -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [RFC PATCH 5/6] usb: otg: add device tree support to otg library
On 01/21/2013 03:34 PM, kishon wrote: On Monday 21 January 2013 06:51 PM, Roger Quadros wrote: On 01/16/2013 05:01 PM, Kishon Vijay Abraham I wrote: 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 m...@pengutronix.de Signed-off-by: Kishon Vijay Abraham I kis...@ti.com --- drivers/usb/otg/otg.c | 77 +++ include/linux/usb/phy.h |8 + 2 files changed, 85 insertions(+) diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c index dbf2043..e9799bb 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 @@ -34,6 +36,20 @@ static struct usb_phy *__usb_find_phy(struct device *dev, u8 index) 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; @@ -109,6 +125,67 @@ 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 = NULL, **ptr; +unsigned longflags; +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); +return ERR_PTR(-ENOMEM); +} I fail to understand why you need ptr at all and why do devres_alloc() for it. Thats how we create a managed device resource. You can have a look at Documentation/driver-model/devres.txt and drivers/base/devres.c. OK, I get it now. You might want to update the text file too since you are adding a automagically managed interface. regards, -roger -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[RFC PATCH 5/6] 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 m...@pengutronix.de Signed-off-by: Kishon Vijay Abraham I kis...@ti.com --- drivers/usb/otg/otg.c | 77 +++ include/linux/usb/phy.h |8 + 2 files changed, 85 insertions(+) diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c index dbf2043..e9799bb 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 @@ -34,6 +36,20 @@ static struct usb_phy *__usb_find_phy(struct device *dev, u8 index) 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; @@ -109,6 +125,67 @@ 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 = NULL, **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); + return ERR_PTR(-ENOMEM); + } + + 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 err0; + } + + *ptr = phy; + devres_add(dev, ptr); + + get_device(phy-dev); + +err0: + spin_unlock_irqrestore(phy_lock, flags); + + return phy; +} +EXPORT_SYMBOL(devm_usb_get_phy_by_phandle); + /** * devm_usb_put_phy - release the USB PHY * @dev - device that wants to release this phy diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h index d133c8b..5836b6d 100644 --- a/include/linux/usb/phy.h +++ b/include/linux/usb/phy.h @@ -163,6 +163,8 @@ usb_phy_shutdown(struct usb_phy *x) #ifdef CONFIG_USB_OTG_UTILS extern struct usb_phy *usb_get_phy(struct device *dev, u8 index); extern struct usb_phy *devm_usb_get_phy(struct device *dev, u8 index); +extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, + const char *phandle, u8 index); extern void usb_put_phy(struct usb_phy *); extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x); extern struct usb_phy_bind *usb_bind_phy(const char *dev_name, u8 index, @@ -178,6 +180,12 @@ static inline struct usb_phy *devm_usb_get_phy(struct device *dev, u8 index) return NULL; } +static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, + const char *phandle, u8 index) +{ + return NULL; +} + static inline void usb_put_phy(struct usb_phy *x) { } -- 1.7.9.5 -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html