v4l: rcar-fcp: Add an API to retrieve the FCP device

The new rcar_fcp_get_device() function retrieves the struct device
related to the FCP device. This is useful to handle DMA mapping through
the right device.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Mauro Cavalho Chehab <mchehab@s-opensource.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/media/platform/rcar-fcp.c b/drivers/media/platform/rcar-fcp.c
index e9f609edf513..2988031d285d 100644
--- a/drivers/media/platform/rcar-fcp.c
+++ b/drivers/media/platform/rcar-fcp.c
@@ -78,6 +78,12 @@ void rcar_fcp_put(struct rcar_fcp_device *fcp)
 }
 EXPORT_SYMBOL_GPL(rcar_fcp_put);
 
+struct device *rcar_fcp_get_device(struct rcar_fcp_device *fcp)
+{
+        return fcp->dev;
+}
+EXPORT_SYMBOL_GPL(rcar_fcp_get_device);
+
 /**
  * rcar_fcp_enable - Enable an FCP
  * @fcp: The FCP instance
diff --git a/include/media/rcar-fcp.h b/include/media/rcar-fcp.h
index 8723f05c6321..b60a7b176c37 100644
--- a/include/media/rcar-fcp.h
+++ b/include/media/rcar-fcp.h
@@ -19,6 +19,7 @@ struct rcar_fcp_device;
 #if IS_ENABLED(CONFIG_VIDEO_RENESAS_FCP)
 struct rcar_fcp_device *rcar_fcp_get(const struct device_node *np);
 void rcar_fcp_put(struct rcar_fcp_device *fcp);
+struct device *rcar_fcp_get_device(struct rcar_fcp_device *fcp);
 int rcar_fcp_enable(struct rcar_fcp_device *fcp);
 void rcar_fcp_disable(struct rcar_fcp_device *fcp);
 #else
@@ -27,6 +28,10 @@ static inline struct rcar_fcp_device *rcar_fcp_get(const struct device_node *np)
         return ERR_PTR(-ENOENT);
 }
 static inline void rcar_fcp_put(struct rcar_fcp_device *fcp) { }
+static inline struct device *rcar_fcp_get_device(struct rcar_fcp_device *fcp)
+{
+        return NULL;
+}
 static inline int rcar_fcp_enable(struct rcar_fcp_device *fcp)
 {
         return 0;