On Tue, Dec 22, 2020 at 4:17 PM Jernej Škrabec <jernej.skrabec@xxxxxxxx> wrote:
>
> Hi!
>
> Dne petek, 18. december 2020 ob 20:50:33 CET je Paul Kocialkowski napisal(a):
> > This adds a device-tree definition for the CSI0 MCLK pin,
> > which can be used for feeding MIPI CSI-2 sensors.
> >
> > Signed-off-by: Paul Kocialkowski <contact@xxxxxxxx>
>
> Is this used anywhere? Current policy is to add pin definitions only if any
> user exists.
IIRC we sort of loosened that requirement with the use of /omit-if-no-ref/.
The A20 dtsi file has a whole bunch of pins defined that are not directly
used but are available for users to reference, especially in overlays.
The "-@" parameter for the device tree compiler, used to build overlay
compatible DTBs, makes the compiler ignore /omit-if-no-ref/ and include
all the nodes.
ChenYu
> Best regards,
> Jernej
>
> > ---
> > arch/arm/boot/dts/sun8i-v3s.dtsi | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi
> > b/arch/arm/boot/dts/sun8i-v3s.dtsi index a9f5795d4e57..bff822b9fa01 100644
> > --- a/arch/arm/boot/dts/sun8i-v3s.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-v3s.dtsi
> > @@ -337,6 +337,12 @@ pio: pinctrl@1c20800 {
> > interrupt-controller;
> > #interrupt-cells = <3>;
> >
> > + /omit-if-no-ref/
> > + csi0_mclk_pin: csi0-mclk-pin {
> > + pins = "PE20";
> > + function = "csi_mipi";
> > + };
> > +
> > /omit-if-no-ref/
> > csi1_8bit_pins: csi1-8bit-pins {
> > pins = "PE0", "PE2", "PE3",
> "PE8", "PE9",
>
>
>
>
