linux-kernel - [PATCH v6 03/35] component: Add aggregate_device

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Date:   Thu, 27 Jan 2022 12:01:09 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Saravana Kannan <saravanak@...gle.com>
Subject: [PATCH v6 03/35] component: Add aggregate_device_parent() for driver use

This allows aggregate driver writers to get the parent of the aggregate
device passed to their probe/remove/shutdown functions.

Suggested-by: Jani Nikula <jani.nikula@...el.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rob Clark <robdclark@...il.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/base/component.c  | 6 ++++++
 include/linux/component.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index dc748ef0b23b..13ac2004a913 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -71,6 +71,12 @@ static inline struct aggregate_device *to_aggregate_device(struct device *d)
 	return container_of(d, struct aggregate_device, dev);
 }
 
+struct device *aggregate_device_parent(const struct aggregate_device *adev)
+{
+	return adev->parent;
+}
+EXPORT_SYMBOL_GPL(aggregate_device_parent);
+
 struct component {
 	struct list_head node;
 	struct aggregate_device *adev;
diff --git a/include/linux/component.h b/include/linux/component.h
index aa69ea0401d3..c39dea7824af 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -43,6 +43,7 @@ int component_bind_all(struct device *parent, void *data);
 void component_unbind_all(struct device *parent, void *data);
 
 struct aggregate_device;
+struct device *aggregate_device_parent(const struct aggregate_device *adev);
 
 /**
  * struct component_master_ops - callback for the aggregate driver
-- 
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