media: davinci: vpif: Use platform_get_irq_optional() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_optional().

While at it, propagate error code in case devm_request_irq() fails
instead of returning -EINVAL.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/davinci/vpif.c

@@ -20,8 +20,10 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/spinlock.h>
@@ -437,11 +439,12 @@ static void vpif_pdev_release(struct device *dev)
 
 static int vpif_probe(struct platform_device *pdev)
 {
-	static struct resource *res_irq;
+	static struct resource res_irq;
 	struct platform_device *pdev_capture, *pdev_display;
 	struct device_node *endpoint = NULL;
 	struct vpif_data *data;
 	int ret;
+	int irq;
 
 	vpif_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(vpif_base))
@@ -471,12 +474,13 @@ static int vpif_probe(struct platform_device *pdev)
 	 * For DT platforms, manually create platform_devices for
 	 * capture/display drivers.
 	 */
-	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res_irq) {
-		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
-		ret = -EINVAL;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
 		goto err_put_rpm;
 	}
+	res_irq = (struct resource)DEFINE_RES_IRQ_NAMED(irq, of_node_full_name(pdev->dev.of_node));
+	res_irq.flags |= irq_get_trigger_type(irq);
 
 	pdev_capture = kzalloc(sizeof(*pdev_capture), GFP_KERNEL);
 	if (!pdev_capture) {
@@ -486,7 +490,7 @@ static int vpif_probe(struct platform_device *pdev)
 
 	pdev_capture->name = "vpif_capture";
 	pdev_capture->id = -1;
-	pdev_capture->resource = res_irq;
+	pdev_capture->resource = &res_irq;
 	pdev_capture->num_resources = 1;
 	pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
 	pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
@@ -505,7 +509,7 @@ static int vpif_probe(struct platform_device *pdev)
 
 	pdev_display->name = "vpif_display";
 	pdev_display->id = -1;
-	pdev_display->resource = res_irq;
+	pdev_display->resource = &res_irq;
 	pdev_display->num_resources = 1;
 	pdev_display->dev.dma_mask = pdev->dev.dma_mask;
 	pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;

drivers/media/platform/davinci/vpif_capture.c

@@ -1607,7 +1607,6 @@ static __init int vpif_probe(struct platform_device *pdev)
 {
 	struct vpif_subdev_info *subdevdata;
 	struct i2c_adapter *i2c_adap;
-	struct resource *res;
 	int subdev_count;
 	int res_idx = 0;
 	int i, err;
@@ -1632,17 +1631,23 @@ static __init int vpif_probe(struct platform_device *pdev)
 		goto vpif_free;
 	}
 
-	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
-		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
-					IRQF_SHARED, VPIF_DRIVER_NAME,
-					(void *)(&vpif_obj.dev[res_idx]->
-					channel_id));
-		if (err) {
-			err = -EINVAL;
+	do {
+		int irq;
+
+		err = platform_get_irq_optional(pdev, res_idx);
+		if (err < 0 && err != -ENXIO)
 			goto vpif_unregister;
-		}
-		res_idx++;
-	}
+		if (err > 0)
+			irq = err;
+		else
+			break;
+
+		err = devm_request_irq(&pdev->dev, irq, vpif_channel_isr,
+				       IRQF_SHARED, VPIF_DRIVER_NAME,
+				       (void *)(&vpif_obj.dev[res_idx]->channel_id));
+		if (err)
+			goto vpif_unregister;
+	} while (++res_idx);
 
 	vpif_obj.config = pdev->dev.platform_data;
 

drivers/media/platform/davinci/vpif_display.c

@@ -1221,7 +1221,6 @@ static __init int vpif_probe(struct platform_device *pdev)
 {
 	struct vpif_subdev_info *subdevdata;
 	struct i2c_adapter *i2c_adap;
-	struct resource *res;
 	int subdev_count;
 	int res_idx = 0;
 	int i, err;
@@ -1245,18 +1244,25 @@ static __init int vpif_probe(struct platform_device *pdev)
 		goto vpif_free;
 	}
 
-	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
-		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
-					IRQF_SHARED, VPIF_DRIVER_NAME,
-					(void *)(&vpif_obj.dev[res_idx]->
-					channel_id));
+	do {
+		int irq;
+
+		err = platform_get_irq_optional(pdev, res_idx);
+		if (err < 0 && err != -ENXIO)
+			goto vpif_unregister;
+		if (err > 0)
+			irq = err;
+		else
+			break;
+
+		err = devm_request_irq(&pdev->dev, irq, vpif_channel_isr,
+				       IRQF_SHARED, VPIF_DRIVER_NAME,
+				       (void *)(&vpif_obj.dev[res_idx]->channel_id));
 		if (err) {
-			err = -EINVAL;
 			vpif_err("VPIF IRQ request failed\n");
 			goto vpif_unregister;
 		}
-		res_idx++;
-	}
+	} while (++res_idx);
 
 	vpif_obj.config = pdev->dev.platform_data;
 	subdev_count = vpif_obj.config->subdev_count;