drm: zynqmp_dp: convert to devm_drm_bridge_alloc() API

This is the new API for allocating DRM bridges.

This driver has a peculiar structure. zynqmp_dpsub.c is the actual driver,
which delegates to a submodule (zynqmp_dp.c) the allocation of a
sub-structure embedding the drm_bridge and its initialization, however it
does not delegate the drm_bridge_add(). Hence, following carefully the code
flow, it is correct to change the allocation function and .funcs assignment
in the submodule, while the drm_bridge_add() is not in that submodule.

Acked-by: Maxime Ripard <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Luca Ceresoli <[e-mail]>

drivers/gpu/drm/xlnx/zynqmp_dp.c

···
 	struct zynqmp_dp *dp;
 	int ret;
 
-	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
-	if (!dp)
-		return -ENOMEM;
+	dp = devm_drm_bridge_alloc(&pdev->dev, struct zynqmp_dp, bridge, &zynqmp_dp_bridge_funcs);
+	if (IS_ERR(dp))
+		return PTR_ERR(dp);
 
 	dp->dev = &pdev->dev;
 	dp->dpsub = dpsub;
···
 
 	/* Acquire all resources (IOMEM, IRQ and PHYs). */
 	dp->iomem = devm_platform_ioremap_resource_byname(pdev, "dp");
-	if (IS_ERR(dp->iomem)) {
-		ret = PTR_ERR(dp->iomem);
-		goto err_free;
-	}
+	if (IS_ERR(dp->iomem))
+		return PTR_ERR(dp->iomem);
 
 	dp->irq = platform_get_irq(pdev, 0);
-	if (dp->irq < 0) {
-		ret = dp->irq;
-		goto err_free;
-	}
+	if (dp->irq < 0)
+		return dp->irq;
 
 	dp->reset = devm_reset_control_get(dp->dev, NULL);
-	if (IS_ERR(dp->reset)) {
-		ret = dev_err_probe(dp->dev, PTR_ERR(dp->reset),
+	if (IS_ERR(dp->reset))
+		return dev_err_probe(dp->dev, PTR_ERR(dp->reset),
 				    "failed to get reset\n");
-		goto err_free;
-	}
 
 	ret = zynqmp_dp_reset(dp, true);
 	if (ret < 0)
-		goto err_free;
+		return ret;
 
 	ret = zynqmp_dp_reset(dp, false);
 	if (ret < 0)
-		goto err_free;
+		return ret;
 
 	ret = zynqmp_dp_phy_probe(dp);
 	if (ret)
···
 
 	/* Initialize the bridge. */
 	bridge = &dp->bridge;
-	bridge->funcs = &zynqmp_dp_bridge_funcs;
 	bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
 		    | DRM_BRIDGE_OP_HPD;
 	bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
···
 	zynqmp_dp_phy_exit(dp);
 err_reset:
 	zynqmp_dp_reset(dp, true);
-err_free:
-	kfree(dp);
 	return ret;
 }
 

drivers/gpu/drm/xlnx/zynqmp_dpsub.c

···
 void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)
 {
 	kfree(dpsub->disp);
-	kfree(dpsub->dp);
 	kfree(dpsub);
 }