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a=rsa-sha256; c=relaxed/relaxed; d=renesasgroup.onmicrosoft.com; s=selector1-renesas-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=sYPlSsyfHU+ApvixOnlZYauXSFl9nlt0bUWvfu4KG6Q=; b=m5I5EbiCHQ0LeCBz8WnRh3SQOSJiS+Dw09kMmojoYPOKd8VaN04EnmtKtPq9vpW795FWprEAJpbbPWi+kgQTJOwWHPFLPyz2OfpxA74LeJYzZMMvU2mkoom3+pjjxPjBnx9HQLtwT6MMuFewn8EypEAZC0ou85A6yS06O2/K3qY= Received: from localhost.localdomain (211.11.155.138) by TYAPR01MB2304.jpnprd01.prod.outlook.com (2603:1096:404:8::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.696.13; Thu, 26 Apr 2018 11:27:07 +0000 From: Yoshihiro Shimoda To: gregkh@linuxfoundation.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: heikki.krogerus@linux.intel.com, hdegoede@redhat.com, andy.shevchenko@gmail.com, linux-usb@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH/RFC v2 2/6] base: devcon: add a new API to find the graph Date: Thu, 26 Apr 2018 20:26:42 +0900 Message-Id: <1524742006-17984-3-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1524742006-17984-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1524742006-17984-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> MIME-Version: 1.0 X-Originating-IP: [211.11.155.138] X-ClientProxiedBy: OSAPR01CA0066.jpnprd01.prod.outlook.com (2603:1096:604:a::30) To TYAPR01MB2304.jpnprd01.prod.outlook.com (2603:1096:404:8::18) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:; 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Signed-off-by: Yoshihiro Shimoda --- Documentation/driver-api/device_connection.rst | 4 +-- drivers/base/devcon.c | 43 ++++++++++++++++++++++++++ include/linux/device.h | 2 ++ 3 files changed, 47 insertions(+), 2 deletions(-) diff --git a/Documentation/driver-api/device_connection.rst b/Documentation/driver-api/device_connection.rst index affbc556..2e2d26f 100644 --- a/Documentation/driver-api/device_connection.rst +++ b/Documentation/driver-api/device_connection.rst @@ -19,7 +19,7 @@ Device connections alone do not create a dependency between the two devices. They are only descriptions which are not tied to either of the devices directly. A dependency between the two devices exists only if one of the two endpoint devices requests a reference to the other. The descriptions themselves can be -defined in firmware (not yet supported) or they can be built-in. +defined in firmware or they can be built-in. Usage ----- @@ -40,4 +40,4 @@ API --- .. kernel-doc:: drivers/base/devcon.c - : functions: device_connection_find_match device_connection_find device_connection_add device_connection_remove + : functions: device_connection_find_match device_connection_find device_connection_add device_connection_remove device_connection_find_by_graph diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c index d427e80..5a0da33 100644 --- a/drivers/base/devcon.c +++ b/drivers/base/devcon.c @@ -7,6 +7,7 @@ */ #include +#include static DEFINE_MUTEX(devcon_lock); static LIST_HEAD(devcon_list); @@ -134,3 +135,45 @@ void device_connection_remove(struct device_connection *con) mutex_unlock(&devcon_lock); } EXPORT_SYMBOL_GPL(device_connection_remove); + +static int generic_graph_match(struct device *dev, void *fwnode) +{ + return dev->fwnode == fwnode; +} + +/** + * device_connection_find_by_graph - Find two devices connected together + * @dev: Device to find connected device + * @port: identifier of the @dev port node + * @endpoint: identifier of the @dev endpoint node + * + * Find a connection with @port and @endpoint by using graph between @dev and + * another device. On success returns handle to the device that is connected + * to @dev, with the reference count for the found device incremented. Returns + * NULL if no matching connection was found, or ERR_PTR(-EPROBE_DEFER) when + * a connection was found but the other device has not been enumerated yet. + */ +struct device *device_connection_find_by_graph(struct device *dev, u32 port, + u32 endpoint) +{ + struct bus_type *bus; + struct fwnode_handle *remote; + struct device *conn; + + remote = fwnode_graph_get_remote_node(dev_fwnode(dev), port, endpoint); + if (!remote) + return NULL; + + for (bus = generic_match_buses[0]; bus; bus++) { + conn = bus_find_device(bus, NULL, remote, generic_graph_match); + if (conn) + return conn; + } + + /* + * We only get called if a connection was found, tell the caller to + * wait for the other device to show up. + */ + return ERR_PTR(-EPROBE_DEFER); +} +EXPORT_SYMBOL_GPL(device_connection_find_by_graph); diff --git a/include/linux/device.h b/include/linux/device.h index 0059b99..58f8544 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -751,6 +751,8 @@ void *device_connection_find_match(struct device *dev, const char *con_id, void device_connection_add(struct device_connection *con); void device_connection_remove(struct device_connection *con); +struct device *device_connection_find_by_graph(struct device *dev, u32 port, + u32 endpoint); /** * enum device_link_state - Device link states.