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From: Saravana Kannan <saravanak@google.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Len Brown <lenb@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Marc Zyngier <maz@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Saravana Kannan <saravanak@google.com>,
	Tomi Valkeinen <tomi.valkeinen@ti.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Grygorii Strashko <grygorii.strashko@ti.com>,
	kernel-team@android.com, linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: [PATCH v1 13/18] driver core: Add fwnode_get_next_parent_dev() helper function
Date: Wed,  4 Nov 2020 15:23:50 -0800	[thread overview]
Message-ID: <20201104232356.4038506-14-saravanak@google.com> (raw)
In-Reply-To: <20201104232356.4038506-1-saravanak@google.com>

Given a fwnode, this function finds the closest ancestor fwnode that has
a corresponding struct device. The function returns this struct device.
This function will be used in a subsequent patch in this series.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 drivers/base/core.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index ee28d8c7ee85..4ae5f2885ac5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1562,6 +1562,31 @@ static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode)
 		fw_devlink_parse_fwtree(child);
 }
 
+/**
+ * fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
+ * @fwnode: firmware node
+ *
+ * Given a firmware node (@fwnode), this function finds its closest ancestor
+ * firmware node that has a corresponding struct device and returns that struct
+ * device.
+ *
+ * The caller of this function is expected to call put_device() on the returned
+ * device when they are done.
+ */
+static struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
+{
+	struct device *dev = NULL;
+
+	fwnode_handle_get(fwnode);
+	do {
+		fwnode = fwnode_get_next_parent(fwnode);
+		if (fwnode)
+			dev = get_dev_from_fwnode(fwnode);
+	} while (fwnode && !dev);
+	fwnode_handle_put(fwnode);
+	return dev;
+}
+
 static void fw_devlink_link_device(struct device *dev)
 {
 	int fw_ret;
-- 
2.29.1.341.ge80a0c044ae-goog


  parent reply	other threads:[~2020-11-04 23:24 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-04 23:23 [PATCH v1 00/18] Refactor fw_devlink to significantly improve boot time Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 01/18] Revert "driver core: Avoid deferred probe due to fw_devlink_pause/resume()" Saravana Kannan
2020-11-05  9:34   ` Greg Kroah-Hartman
2020-11-05 23:19     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 02/18] Revert "driver core: Rename dev_links_info.defer_sync to defer_hook" Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 03/18] Revert "driver core: Don't do deferred probe in parallel with kernel_init thread" Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 04/18] Revert "driver core: Remove check in driver_deferred_probe_force_trigger()" Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 05/18] Revert "of: platform: Batch fwnode parsing when adding all top level devices" Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 06/18] Revert "driver core: fw_devlink: Add support for batching fwnode parsing" Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 07/18] driver core: Add fwnode_init() Saravana Kannan
2020-11-05  9:36   ` Greg Kroah-Hartman
2020-11-05 23:20     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 08/18] driver core: Add fwnode link support Saravana Kannan
2020-11-16 15:51   ` Rafael J. Wysocki
2020-11-21  1:59     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 09/18] driver core: Allow only unprobed consumers for SYNC_STATE_ONLY device links Saravana Kannan
2020-11-16 15:57   ` Rafael J. Wysocki
2020-11-21  1:59     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 10/18] device property: Add fwnode_is_ancestor_of() Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 11/18] driver core: Redefine the meaning of fwnode_operations.add_links() Saravana Kannan
2020-11-16 16:16   ` Rafael J. Wysocki
2020-11-21  1:59     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 12/18] driver core: Add fw_devlink_parse_fwtree() Saravana Kannan
2020-11-16 16:25   ` Rafael J. Wysocki
2020-11-21  2:00     ` Saravana Kannan
2020-11-04 23:23 ` Saravana Kannan [this message]
2020-11-16 16:27   ` [PATCH v1 13/18] driver core: Add fwnode_get_next_parent_dev() helper function Rafael J. Wysocki
2020-11-21  2:00     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 14/18] driver core: Use device's fwnode to check if it is waiting for suppliers Saravana Kannan
2020-11-16 16:34   ` Rafael J. Wysocki
2020-11-21  2:00     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 15/18] of: property: Update implementation of add_links() to create fwnode links Saravana Kannan
2020-11-05  9:42   ` Greg Kroah-Hartman
2020-11-05 23:25     ` Saravana Kannan
2020-11-06  1:24       ` Saravana Kannan
2020-11-06  7:22       ` Greg Kroah-Hartman
2020-11-06  7:41         ` Saravana Kannan
2020-11-06  7:51           ` Greg Kroah-Hartman
2020-11-06  8:29             ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 16/18] efi: " Saravana Kannan
2020-11-05  9:43   ` Greg Kroah-Hartman
2020-11-05 23:27     ` Saravana Kannan
2020-11-06  6:45       ` Greg Kroah-Hartman
2020-11-04 23:23 ` [PATCH v1 17/18] driver core: Add helper functions to convert fwnode links to device links Saravana Kannan
2020-11-05  9:43   ` Greg Kroah-Hartman
2020-11-05 23:32     ` Saravana Kannan
2020-11-06  7:24       ` Greg Kroah-Hartman
2020-11-06  7:43         ` Saravana Kannan
2020-11-16 16:57   ` Rafael J. Wysocki
2020-11-21  2:00     ` Saravana Kannan
2020-11-04 23:23 ` [PATCH v1 18/18] driver core: Refactor fw_devlink feature Saravana Kannan
2020-11-04 23:26 ` [PATCH v1 00/18] Refactor fw_devlink to significantly improve boot time Saravana Kannan
2020-11-06  5:09 ` Laurent Pinchart
2020-11-06  8:36   ` Saravana Kannan
2020-11-06 12:46     ` Grygorii Strashko

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