Am Freitag, den 06.01.2017, 18:11 -0800 schrieb Steve Longerbeam: > Add bindings documentation for the i.MX media driver. > > Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/media/imx.txt | 57 +++++++++++++++++++++++++ > 1 file changed, 57 insertions(+) > create mode 100644 Documentation/devicetree/bindings/media/imx.txt > > diff --git a/Documentation/devicetree/bindings/media/imx.txt b/Documentation/devicetree/bindings/media/imx.txt > new file mode 100644 > index 0000000..254b64a > --- /dev/null > +++ b/Documentation/devicetree/bindings/media/imx.txt > @@ -0,0 +1,57 @@ > +Freescale i.MX Media Video Devices > + > +Video Media Controller node > +--------------------------- > + > +This is the parent media controller node for video capture support. > + > +Required properties: > +- compatible : "fsl,imx-media"; Would you be opposed to calling this "capture-subsystem" instead of "imx-media"? We already use "fsl,imx-display-subsystem" and "fsl,imx-gpu-subsystem" for the display and GPU compound devices. > +- ports : Should contain a list of phandles pointing to camera > + sensor interface ports of IPU devices > + > + > +fim child node > +-------------- > + > +This is an optional child node of the ipu_csi port nodes. If present and > +available, it enables the Frame Interval Monitor. Its properties can be > +used to modify the method in which the FIM measures frame intervals. > +Refer to Documentation/media/v4l-drivers/imx.rst for more info on the > +Frame Interval Monitor. > + > +Optional properties: > +- fsl,input-capture-channel: an input capture channel and channel flags, > + specified as <chan flags>. The channel number > + must be 0 or 1. The flags can be > + IRQ_TYPE_EDGE_RISING, IRQ_TYPE_EDGE_FALLING, or > + IRQ_TYPE_EDGE_BOTH, and specify which input > + capture signal edge will trigger the input > + capture event. If an input capture channel is > + specified, the FIM will use this method to > + measure frame intervals instead of via the EOF > + interrupt. The input capture method is much > + preferred over EOF as it is not subject to > + interrupt latency errors. However it requires > + routing the VSYNC or FIELD output signals of > + the camera sensor to one of the i.MX input > + capture pads (SD1_DAT0, SD1_DAT1), which also > + gives up support for SD1. This is a clever method to get better frame timestamps. Too bad about the routing requirements. Can this be used on Nitrogen6X? > + > +mipi_csi2 node > +-------------- > + > +This is the device node for the MIPI CSI-2 Receiver, required for MIPI > +CSI-2 sensors. > + > +Required properties: > +- compatible : "fsl,imx6-mipi-csi2"; I think this should get an additional "snps,dw-mipi-csi2" compatible, since the only i.MX6 specific part is the bolted-on IPU2CSI gasket. > +- reg : physical base address and length of the register set; > +- clocks : the MIPI CSI-2 receiver requires three clocks: hsi_tx > + (the DPHY clock), video_27m, and eim_sel; Note that hsi_tx is incorrectly named. CCGR3[CG8] just happens to be the shared gate bit that gates the HSI clocks as well as the MIPI "ac_clk_125m", "cfg_clk", "ips_clk", and "pll_refclk" inputs to the mipi csi-2 core, but we are missing shared gate clocks in the clock tree for these. Both cfg_clk and pll_refclk are sourced from video_27m, so "cfg" -> video_27m seems fine. But I don't get "dphy". Which input clock would that correspond to? "pll_refclk?" Also the pixel clock input is a gate after aclk_podf (which we call eim_podf), not aclk_sel (eim_sel). > +- clock-names : must contain "dphy", "cfg", "pix"; > + > +Optional properties: > +- interrupts : must contain two level-triggered interrupts, > + in order: 100 and 101; regards Philipp -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
