drm/vc4: dpi: Remove vc4_dev dpi pointer

There's no user for that pointer so let's just get rid of it.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-24-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_dpi.c

@@ -269,7 +269,6 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm = dev_get_drvdata(master);
-	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dpi *dpi;
 	struct vc4_dpi_encoder *vc4_dpi_encoder;
 	int ret;
@@ -328,8 +327,6 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 
 	dev_set_drvdata(dev, dpi);
 
-	vc4->dpi = dpi;
-
 	vc4_debugfs_add_regset32(drm, "dpi_regs", &dpi->regset);
 
 	return 0;
@@ -343,8 +340,6 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 static void vc4_dpi_unbind(struct device *dev, struct device *master,
 			   void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
-	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dpi *dpi = dev_get_drvdata(dev);
 
 	drm_of_panel_bridge_remove(dev->of_node, 0, 0);
@@ -352,8 +347,6 @@ static void vc4_dpi_unbind(struct device *dev, struct device *master,
 	drm_encoder_cleanup(dpi->encoder);
 
 	clk_disable_unprepare(dpi->core_clock);
-
-	vc4->dpi = NULL;
 }
 
 static const struct component_ops vc4_dpi_ops = {

drivers/gpu/drm/vc4/vc4_drv.h

@@ -84,7 +84,6 @@ struct vc4_dev {
 
 	struct vc4_hvs *hvs;
 	struct vc4_v3d *v3d;
-	struct vc4_dpi *dpi;
 	struct vc4_vec *vec;
 	struct vc4_txp *txp;