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author | Kevin Hilman <khilman@baylibre.com> | 2017-06-09 13:10:26 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-06-20 09:05:37 -0300 |
commit | 479f7a1181058689435baddc16a6a42e1a8ff0e8 (patch) | |
tree | 1ba82ac7712bb71ab4b11f25cd43d4227937e849 /drivers/media/platform/davinci | |
parent | 72b7876c2e3b6087c72ce030d8145ec4a7328121 (diff) | |
download | op-kernel-dev-479f7a1181058689435baddc16a6a42e1a8ff0e8.zip op-kernel-dev-479f7a1181058689435baddc16a6a42e1a8ff0e8.tar.gz |
[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')
-rw-r--r-- | drivers/media/platform/davinci/vpif.c | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c index 1b02a63..07e89a4 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; } |