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authorKevin Hilman <khilman@baylibre.com>2017-06-09 13:10:26 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-06-20 09:05:37 -0300
commit479f7a1181058689435baddc16a6a42e1a8ff0e8 (patch)
tree1ba82ac7712bb71ab4b11f25cd43d4227937e849 /drivers/media/platform/davinci/vpif.c
parent72b7876c2e3b6087c72ce030d8145ec4a7328121 (diff)
[media] davinci: vpif: adaptions for DT support
The davinci VPIF is a single hardware block, but the existing driver is broken up into a common library (vpif.c), output (vpif_display.c) and intput (vpif_capture.c). When migrating to DT, to better model the hardware, and because registers, interrupts, etc. are all common,it was decided to have a single VPIF hardware node[1]. Because davinci uses legacy, non-DT boot on several SoCs still, the platform_drivers need to remain. But they are also needed in DT boot. Since there are no DT nodes for the display/capture parts in DT boot (there is a single node for the parent/common device) we need to create platform_devices somewhere to instantiate the platform_drivers. When VPIF display/capture are needed for a DT boot, the VPIF node will have endpoints defined for its subdevs. Therefore, vpif_probe() checks for the presence of endpoints, and if detected manually creates the platform_devices for the display and capture platform_drivers. [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt Signed-off-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Hans Verkuil <hansverk@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/platform/davinci/vpif.c')
-rw-r--r--drivers/media/platform/davinci/vpif.c57
1 files changed, 56 insertions, 1 deletions
diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 1b02a6363f77..07e89a4985a6 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -26,6 +26,7 @@
#include <linux/pm_runtime.h>
#include <linux/spinlock.h>
#include <linux/v4l2-dv-timings.h>
+#include <linux/of_graph.h>
#include "vpif.h"
@@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
static int vpif_probe(struct platform_device *pdev)
{
- static struct resource *res;
+ static struct resource *res, *res_irq;
+ struct platform_device *pdev_capture, *pdev_display;
+ struct device_node *endpoint = NULL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
vpif_base = devm_ioremap_resource(&pdev->dev, res);
@@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
spin_lock_init(&vpif_lock);
dev_info(&pdev->dev, "vpif probe success\n");
+
+ /*
+ * If VPIF Node has endpoints, assume "new" DT support,
+ * where capture and display drivers don't have DT nodes
+ * so their devices need to be registered manually here
+ * for their legacy platform_drivers to work.
+ */
+ endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
+ endpoint);
+ if (!endpoint)
+ return 0;
+
+ /*
+ * 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");
+ return -EINVAL;
+ }
+
+ 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->num_resources = 1;
+ pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
+ pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+ pdev_capture->dev.parent = &pdev->dev;
+ platform_device_register(pdev_capture);
+ } else {
+ dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
+ }
+
+ pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
+ GFP_KERNEL);
+ if (pdev_display) {
+ pdev_display->name = "vpif_display";
+ pdev_display->id = -1;
+ 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;
+ pdev_display->dev.parent = &pdev->dev;
+ platform_device_register(pdev_display);
+ } else {
+ dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
+ }
+
return 0;
}