summaryrefslogtreecommitdiffstats
path: root/drivers/base/component.c
Commit message (Collapse)AuthorAgeFilesLines
* component: fix bug with legacy APIRussell King2014-07-041-4/+6
| | | | | | | | | Sachin Kamat reports that "component: add support for component match array" broke Exynos DRM due to a NULL pointer deref. Fix this. Reported-by: Sachin Kamat <sachin.kamat@samsung.com> Tested-by: Sachin Kamat <sachin.kamat@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* component: add support for component match arrayRussell King2014-07-031-3/+117
| | | | | | | | | | | Add support for generating a set of component matches at master probe time, and submitting them to the component layer. This allows the component layer to perform the matches internally without needing to call into the master driver, and allows for further restructuring of the component helper. Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* component: ignore multiple additions of the same componentRussell King2014-07-031-2/+8
| | | | | | | | | | Permit masters to call component_master_add_child() and match the same child multiple times. This may happen if there's multiple connections to a single component device from other devices. In such scenarios, we should not return a failure, but instead ignore the attempt. Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* component: fix missed cleanup in case of devres failureRussell King2014-07-031-31/+31
| | | | | | | | | In try_to_bring_up_master(), we tear down the master's component list for each error case, except for devres group failure. Fix this oversight by making the code less prone to such mistakes. Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* drivers/base: fix devres handling for master deviceRussell King2014-02-071-0/+8
| | | | | | | | | We weren't handling the devres issues for the master device failing a bind, or being unbound properly. Add a devres group to contain these, and release the resources at the appropriate points. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/base: provide an infrastructure for componentised subsystemsRussell King2014-01-101-0/+382
Subsystems such as ALSA, DRM and others require a single card-level device structure to represent a subsystem. However, firmware tends to describe the individual devices and the connections between them. Therefore, we need a way to gather up the individual component devices together, and indicate when we have all the component devices. We do this in DT by providing a "superdevice" node which specifies the components, eg: imx-drm { compatible = "fsl,drm"; crtcs = <&ipu1>; connectors = <&hdmi>; }; The superdevice is declared into the component support, along with the subcomponents. The superdevice receives callbacks to locate the subcomponents, and identify when all components are present. At this point, we bind the superdevice, which causes the appropriate subsystem to be initialised in the conventional way. When any of the components or superdevice are removed from the system, we unbind the superdevice, thereby taking the subsystem down. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
OpenPOWER on IntegriCloud