Em Tue, 6 Jun 2017 16:37:41 -0700 Kevin Hilman <[email protected]> escreveu:
> 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 instansiate 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 <[email protected]> > --- > drivers/media/platform/davinci/vpif.c | 49 > ++++++++++++++++++++++++++++++++++- > 1 file changed, 48 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/platform/davinci/vpif.c > b/drivers/media/platform/davinci/vpif.c > index 1b02a6363f77..502917abcb13 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 +438,50 @@ 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); You need to check if it won't return NULL here... > + 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); > + > + pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display), > + GFP_KERNEL); and here. Ok, in thesis, if size is lower than page size, it shouldn't fail, but we still want to have an explicit check[1]. [1] https://lwn.net/Articles/723317/ Thanks, Mauro
