From mboxrd@z Thu Jan 1 00:00:00 1970 From: kishon Subject: Re: [RFC PATCH 5/6] usb: otg: add device tree support to otg library Date: Mon, 21 Jan 2013 19:04:45 +0530 Message-ID: <50FD43F5.1020208@ti.com> References: <1358348462-27693-1-git-send-email-kishon@ti.com> <1358348462-27693-6-git-send-email-kishon@ti.com> <50FD40D1.8020405@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <50FD40D1.8020405-l0cyMroinI0@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: Roger Quadros Cc: linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org, horms-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org, Marc Kleine-Budde , linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, eric.y.miao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, balbi-l0cyMroinI0@public.gmane.org, cbou-JGs/UdohzUI@public.gmane.org, dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org List-Id: devicetree@vger.kernel.org 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 >> Signed-off-by: Kishon Vijay Abraham I >> --- >> 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 >> #include >> #include >> +#include >> #include >> +#include >> >> #include >> >> @@ -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