drm/armada: register crtc with port

Register the CRTC with the port node so that the DRM OF helpers can
find the appropriate CRTC. This is important so that encoders can
identify their corresponding possible CRTCs.

Signed-off-by: Russell King <[e-mail]>

drivers/gpu/drm/armada/armada_crtc.c

···
 
 	writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ENA);
 
+	of_node_put(dcrtc->crtc.port);
+
 	kfree(dcrtc);
 }
 
···
 }
 
 int armada_drm_crtc_create(struct drm_device *drm, struct device *dev,
-	struct resource *res, int irq, const struct armada_variant *variant)
+	struct resource *res, int irq, const struct armada_variant *variant,
+	struct device_node *port)
 {
 	struct armada_private *priv = drm->dev_private;
 	struct armada_crtc *dcrtc;
···
 
 	priv->dcrtc[dcrtc->num] = dcrtc;
 
+	dcrtc->crtc.port = port;
 	drm_crtc_init(drm, &dcrtc->crtc, &armada_crtc_funcs);
 	drm_crtc_helper_add(&dcrtc->crtc, &armada_crtc_helper_funcs);
 
···
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	int irq = platform_get_irq(pdev, 0);
 	const struct armada_variant *variant;
+	struct device_node *port = NULL;
 
 	if (irq < 0)
 		return irq;
···
 		variant = (const struct armada_variant *)id->driver_data;
 	} else {
 		const struct of_device_id *match;
+		struct device_node *np, *parent = dev->of_node;
 
 		match = of_match_device(dev->driver->of_match_table, dev);
 		if (!match)
 			return -ENXIO;
 
+		np = of_get_child_by_name(parent, "ports");
+		if (np)
+			parent = np;
+		port = of_get_child_by_name(parent, "port");
+		of_node_put(np);
+		if (!port) {
+			dev_err(dev, "no port node found in %s\n",
+				parent->full_name);
+			return -ENXIO;
+		}
+
 		variant = match->data;
 	}
 
-	return armada_drm_crtc_create(drm, dev, res, irq, variant);
+	return armada_drm_crtc_create(drm, dev, res, irq, variant, port);
 }
 
 static void

drivers/gpu/drm/armada/armada_crtc.h

···
 };
 #define drm_to_armada_crtc(c) container_of(c, struct armada_crtc, crtc)
 
+struct device_node;
 int armada_drm_crtc_create(struct drm_device *, struct device *,
-	struct resource *, int, const struct armada_variant *);
+	struct resource *, int, const struct armada_variant *,
+	struct device_node *);
 void armada_drm_crtc_gamma_set(struct drm_crtc *, u16, u16, u16, int);
 void armada_drm_crtc_gamma_get(struct drm_crtc *, u16 *, u16 *, u16 *, int);
 void armada_drm_crtc_disable_irq(struct armada_crtc *, u32);

drivers/gpu/drm/armada/armada_drv.c

···
 			goto err_kms;
 
 		ret = armada_drm_crtc_create(dev, dev->dev, res[n], irq,
-					     variant);
+					     variant, NULL);
 		if (ret)
 			goto err_kms;
 	}