2017-02-28 6:36 GMT+01:00 Sekhar Nori <nsekhar@xxxxxx>: > On Tuesday 28 February 2017 04:22 AM, Rob Herring wrote: >> On Wed, Feb 22, 2017 at 02:43:47PM +0100, Bartosz Golaszewski wrote: >>> Add an optional property - enable-gpios - which can be used to specify >>> the GPIOs that must be requested to select the vpif functionality. >>> >>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> >>> --- >>> Documentation/devicetree/bindings/media/ti,da850-vpif.txt | 7 +++++++ >>> 1 file changed, 7 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/media/ti,da850-vpif.txt b/Documentation/devicetree/bindings/media/ti,da850-vpif.txt >>> index df7182a..23c5405 100644 >>> --- a/Documentation/devicetree/bindings/media/ti,da850-vpif.txt >>> +++ b/Documentation/devicetree/bindings/media/ti,da850-vpif.txt >>> @@ -13,6 +13,9 @@ Required properties: >>> - reg: physical base address and length of the registers set for the device; >>> - interrupts: should contain IRQ line for the VPIF >>> >>> +Optional properties: >>> +- enable-gpios: phandle of the GPIOs used to select the vpif functionality >> >> What does this control exactly? The GPIOs belong in the node they are >> connected to and having GPIOs routed to this block seems strange. > > The DA850 EVM board implements on-board muxing which lets the video > input (via VPIF) to be routed to a TVP5147 (video decoder) for composite > input or to a camera header. There are other mux options which use the > same VPIF SoC pins (RMII ethernet or character LCD). > > There is a three-to-eight demux on the board which drives enable signals > to buffers letting you choose from these options. > > From your response, it looks like you want the enable-gpios property to > be in the TVP5147 or camera node. That does make sense to me. > Wouldn't that cause races again? The TVP5147 ADC is probed from within the vpif driver as a media subdev (after initialize_vpif(), v4l2_device_register(), irq requests etc.). Thanks, Bartosz -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
