From patchwork Tue Feb 24 04:01:29 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: NeilBrown X-Patchwork-Id: 5869531 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 761B9BF440 for ; Tue, 24 Feb 2015 04:04:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 778AB2062C for ; Tue, 24 Feb 2015 04:04:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 528F120624 for ; Tue, 24 Feb 2015 04:04:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752503AbbBXEDh (ORCPT ); Mon, 23 Feb 2015 23:03:37 -0500 Received: from cantor2.suse.de ([195.135.220.15]:33126 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752309AbbBXEDf (ORCPT ); Mon, 23 Feb 2015 23:03:35 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 279CAAD18; Tue, 24 Feb 2015 04:03:34 +0000 (UTC) From: NeilBrown To: Dmitry Eremin-Solenikov , Greg Kroah-Hartman , David Woodhouse , Sebastian Reichel , Felipe Balbi Date: Tue, 24 Feb 2015 15:01:29 +1100 Subject: [PATCH 1/2] usb: phy: Add interface to get phy give of device_node. Cc: GTA04 owners , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Message-ID: <20150224040129.32252.88368.stgit@notabene.brown> In-Reply-To: <20150224035809.32252.4180.stgit@notabene.brown> References: <20150224035809.32252.4180.stgit@notabene.brown> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Split the "get phy from device_node" functionality out of "get phy by phandle" so it can be used directly. This is useful when a battery-charger is intimately associated with a particular phy but handled by a separate driver. The charger can find the device_node based on sibling relationships without the need for a redundant declaration in the devicetree description. As a peripheral that gets a phy will often want to register a notifier block, and de-register it later, that functionality is included so the de-registration is automatic. Signed-off-by: NeilBrown --- drivers/usb/phy/phy.c | 97 ++++++++++++++++++++++++++++++++++------------- include/linux/usb/phy.h | 2 + 2 files changed, 72 insertions(+), 27 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c index 2f9735b35338..6b089e19e8db 100644 --- a/drivers/usb/phy/phy.c +++ b/drivers/usb/phy/phy.c @@ -22,6 +22,11 @@ static LIST_HEAD(phy_list); static LIST_HEAD(phy_bind_list); static DEFINE_SPINLOCK(phy_lock); +struct phy_devm { + struct usb_phy *phy; + struct notifier_block *nb; +}; + static struct usb_phy *__usb_find_phy(struct list_head *list, enum usb_phy_type type) { @@ -79,6 +84,15 @@ static void devm_usb_phy_release(struct device *dev, void *res) usb_put_phy(phy); } +static void devm_usb_phy_release2(struct device *dev, void *_res) +{ + struct phy_devm *res = _res; + + if (res->nb) + usb_unregister_notifier(res->phy, res->nb); + usb_put_phy(res->phy); +} + static int devm_usb_phy_match(struct device *dev, void *res, void *match_data) { return res == match_data; @@ -151,40 +165,30 @@ err0: EXPORT_SYMBOL_GPL(usb_get_phy); /** - * devm_usb_get_phy_by_phandle - find the USB PHY by phandle + * devm_usb_get_phy_by_node - find the USB PHY by device_node * @dev - device that requests this phy - * @phandle - name of the property holding the phy phandle value - * @index - the index of the phy + * @node - the device_node for the phy device. + * @nb - a notifier_block to register with the phy. * - * Returns the phy driver associated with the given phandle value, + * Returns the phy driver associated with the given device_node, * 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 + * -EPROBE_DEFER if 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. + * For use by peripheral drivers for devices related to a phy, + * such as a charger. */ -struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, - const char *phandle, u8 index) +struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, + struct device_node *node, + struct notifier_block *nb) { - struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr; + struct usb_phy *phy = ERR_PTR(-ENOMEM); + struct phy_devm *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); + ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL); if (!ptr) { dev_dbg(dev, "failed to allocate memory for devres\n"); goto err0; @@ -203,8 +207,10 @@ struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, devres_free(ptr); goto err1; } - - *ptr = phy; + if (nb) + usb_register_notifier(phy, nb); + ptr->phy = phy; + ptr->nb = nb; devres_add(dev, ptr); get_device(phy->dev); @@ -213,10 +219,47 @@ err1: spin_unlock_irqrestore(&phy_lock, flags); err0: - of_node_put(node); return phy; } +EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node); + +/** + * 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 device_node *node; + struct usb_phy *phy; + + 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); + } + phy = devm_usb_get_phy_by_node(dev, node, NULL); + of_node_put(node); + return phy; +} EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle); /** diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h index bc91b5d380fd..8ed1e29ef329 100644 --- a/include/linux/usb/phy.h +++ b/include/linux/usb/phy.h @@ -205,6 +205,8 @@ extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index); extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index); extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, const char *phandle, u8 index); +extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, + struct device_node *node, struct notifier_block *nb); extern void usb_put_phy(struct usb_phy *); extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x); extern int usb_bind_phy(const char *dev_name, u8 index,