[PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Rob Herring]

On Sun, Feb 12, 2017 at 10:47 PM, Archit Taneja <architt at codeaurora.org> wrote:
>
>
> On 02/10/2017 12:35 AM, Rob Herring wrote:
>>
>> Many drivers have a common pattern of searching the OF graph for either an
>> attached panel or bridge and then finding the DRM struct for the panel
>> or bridge. Also, most drivers need to handle deferred probing when the
>> DRM device is not yet instantiated. Create a common function,
>> drm_of_find_panel_or_bridge, to find the connected node and the
>> associated DRM panel or bridge device.
>>
>> Signed-off-by: Rob Herring <robh at kernel.org>
>> Acked-by: Philipp Zabel <p.zabel at pengutronix.de>
>> ---
>> v2:
>> - Reworked code flow
>> - Added note that at least one of panel or bridge must not be NULL.
>>
>>  drivers/gpu/drm/drm_of.c | 52
>> ++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/drm/drm_of.h     | 13 ++++++++++++
>>  2 files changed, 65 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
>> index 47848ed8ca48..86b8b959587a 100644
>> --- a/drivers/gpu/drm/drm_of.c
>> +++ b/drivers/gpu/drm/drm_of.c
>> @@ -3,7 +3,9 @@
>>  #include <linux/list.h>
>>  #include <linux/of_graph.h>
>>  #include <drm/drmP.h>
>> +#include <drm/drm_bridge.h>
>>  #include <drm/drm_crtc.h>
>> +#include <drm/drm_panel.h>
>>  #include <drm/drm_of.h>
>>
>>  static void drm_release_of(struct device *dev, void *data)
>> @@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node
>> *node,
>>         return -EINVAL;
>>  }
>>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
>> +
>> +/*
>> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
>> + * @np: device tree node containing encoder input ports
>
>
> Should this be 'encoder output ports'? It's the encoder's output port(s)
> that
> contain the endpoint corresponding to the bridge/panel input port.

Yes, indeed.

Rob