[PATCH v2 06/13] media: davinci: vpif: Use platform_get_irq_optional() to get the interrupt

[Lad Prabhakar]

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 in vpif_display.c.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
v1->v2
* Used DEFINE_RES_IRQ_NAMED() macro
* Considered IRQ0 as no IRQ.
---
 drivers/media/platform/davinci/vpif.c         | 18 ++++++++------
 drivers/media/platform/davinci/vpif_capture.c | 24 ++++++++++++-------
 drivers/media/platform/davinci/vpif_display.c | 21 ++++++++++------
 3 files changed, 40 insertions(+), 23 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 5a89d885d0e3..2dbb464399cc 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/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>
@@ -425,9 +427,10 @@ EXPORT_SYMBOL(vpif_channel_getfid);
 
 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;
+	int irq;
 
 	vpif_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(vpif_base))
@@ -453,19 +456,20 @@ 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");
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
 		pm_runtime_put(&pdev->dev);
-		return -EINVAL;
+		return irq;
 	}
+	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 = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
 				    GFP_KERNEL);
 	if (pdev_capture) {
 		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;
@@ -480,7 +484,7 @@ static int vpif_probe(struct platform_device *pdev)
 	if (pdev_display) {
 		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;
diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 8fe55374c5a3..aaf8a0ec98ff 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/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;
@@ -1632,15 +1631,22 @@ 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;
+	while (1) {
+		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)
 			goto vpif_unregister;
-		}
 		res_idx++;
 	}
 
diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
index 59f6b782e104..c4a0c4a4448c 100644
--- a/drivers/media/platform/davinci/vpif_display.c
+++ b/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;
@@ -1245,13 +1244,21 @@ 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));
+	while (1) {
+		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;
 		}
-- 
2.17.1