Hi Russell,
On Monday 30 Jan 2017 22:51:33 Russell King - ARM Linux wrote:
> On Fri, Jan 06, 2017 at 06:11:24PM -0800, Steve Longerbeam wrote:
> > + ov5640: camera@40 {
> > + compatible = "ovti,ov5640";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_ov5640>;
> > + clocks = <&mipi_xclk>;
> > + clock-names = "xclk";
> > + reg = <0x40>;
> > + xclk = <22000000>;
> > + reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>; /* NANDF_D5 */
> > + pwdn-gpios = <&gpio6 9 GPIO_ACTIVE_HIGH>; /* NANDF_WP_B */
> > +
> > + port {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + ov5640_to_mipi_csi: endpoint@1 {
> > + reg = <1>;
> > + remote-endpoint =
<&mipi_csi_from_mipi_sensor>;
> > + data-lanes = <0 1>;
> > + clock-lanes = <2>;
>
> How do you envision a four-lane sensor being described?
>
> data-lanes = <0 1 3 4>;
> clock-lanes = <2>;
>
> ?
>
> The binding document for video-interfaces.txt says:
>
> - clock-lanes: an array of physical clock lane indexes. Position of an entry
> determines the logical lane number, while the value of an entry indicates
> physical lane, e.g. for a MIPI CSI-2 bus we could have "clock-lanes =
> <0>;", which places the clock lane on hardware lane 0. This property is
> valid for serial busses only (e.g. MIPI CSI-2). Note that for the MIPI
> CSI-2 bus this array contains only one entry.
>
> So I think you need to have a good reason to make the clock lane non-zero.
The purpose of the data-lanes and clock-lanes properties is to describe lane
assignment for hardware that supports lane routing. As far as I know the
OV5640 doesn't support lane routing and has dedicated pins for the clock and
data lanes. The data-lanes and clock-lanes properties should probably not be
specified at all.
--
Regards,
Laurent Pinchart
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