Re: [PATCH V2 4/5] arm64: dts: imx8mm-beacon: Enable OV5640 Camera

[Adam Ford <aford173@gmail.com>]

On Sun, Nov 21, 2021 at 5:18 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Adam,
>
> Thank you for the patch.
>
> On Sat, Nov 06, 2021 at 10:54:26AM -0500, Adam Ford wrote:
> > The baseboard has support for a TDNext 5640 Camera which
> > uses an OV5640 connected to a 2-lane CSI2 interface.
> >
> > With the CSI and mipi_csi2 drivers pointing to an OV5640 camera, the media
> > pipeline can be configured with the following:
> >
> >     media-ctl --links "'ov5640 1-003c':0->'imx7-mipi-csis.0':0[1]"
> >
> > The camera and various nodes in the pipeline can be configured for UYVY:
> >     media-ctl -v -V "'ov5640 1-003c':0 [fmt:UYVY8_1X16/640x480 field:none]"
> >     media-ctl -v -V "'csi':0 [fmt:UYVY8_1X16/640x480 field:none]"
> >
> > Signed-off-by: Adam Ford <aford173@gmail.com>
>
> As the ov5640 is on an add-on module, would a DT overlay be better ?

At least for the Beacon / LogicPD boards, I would prefer to avoid the
overlays.  We have an i.M6Q and an OMAP3 board with cameras enabled in
our development kit device trees.  If the cameras are not connected,
they just display a message that the cameras are not communicating and
move on.  I'm OK with that.

>
> > ---
> > V2:  No change
> >
> >  .../freescale/imx8mm-beacon-baseboard.dtsi    | 58 +++++++++++++++++++
> >  1 file changed, 58 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> > index 6f5e63696ec0..0fb95f4a5e78 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> > @@ -43,6 +43,16 @@ reg_audio: regulator-audio {
> >               enable-active-high;
> >       };
> >
> > +     reg_camera: regulator-camera {
> > +             compatible = "regulator-fixed";
> > +             regulator-name = "mipi_pwr";
> > +             regulator-min-microvolt = <2800000>;
> > +             regulator-max-microvolt = <2800000>;
> > +             gpio = <&pca6416_1 0 GPIO_ACTIVE_HIGH>;
> > +             enable-active-high;
> > +             startup-delay-us = <100000>;
> > +     };
> > +
> >       reg_usdhc2_vmmc: regulator-usdhc2 {
> >               compatible = "regulator-fixed";
> >               regulator-name = "VSD_3V3";
> > @@ -67,6 +77,10 @@ sound {
> >       };
> >  };
> >
> > +&csi {
> > +     status = "okay";
> > +};
> > +
> >  &ecspi2 {
> >       pinctrl-names = "default";
> >       pinctrl-0 = <&pinctrl_espi2>;
> > @@ -90,6 +104,30 @@ &i2c2 {
> >       pinctrl-names = "default";
> >       pinctrl-0 = <&pinctrl_i2c2>;
> >       status = "okay";
> > +
> > +     camera@3c {
> > +             compatible = "ovti,ov5640";
> > +             pinctrl-names = "default";
> > +             pinctrl-0 = <&pinctrl_ov5640>;
> > +             reg = <0x3c>;
> > +             clocks = <&clk IMX8MM_CLK_CLKO1>;
> > +             clock-names = "xclk";
> > +             assigned-clocks = <&clk IMX8MM_CLK_CLKO1>;
> > +             assigned-clock-parents = <&clk IMX8MM_CLK_24M>;
> > +             assigned-clock-rates = <24000000>;
> > +             AVDD-supply = <&reg_camera>;  /* 2.8v */
> > +             powerdown-gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
> > +             reset-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
> > +
> > +             port {
> > +                     /* MIPI CSI-2 bus endpoint */
> > +                     ov5640_to_mipi_csi2: endpoint {
> > +                             remote-endpoint = <&imx8mm_mipi_csi_in>;
> > +                             clock-lanes = <0>;
> > +                             data-lanes = <1 2>;
> > +                     };
> > +             };
> > +     };
> >  };
> >
> >  &i2c4 {
> > @@ -141,6 +179,18 @@ pca6416_1: gpio@21 {
> >       };
> >  };
> >
> > +&mipi_csi {
> > +     status = "okay";
> > +     ports {
> > +             port@0 {
> > +                     imx8mm_mipi_csi_in: endpoint {
> > +                             remote-endpoint = <&ov5640_to_mipi_csi2>;
> > +                             data-lanes = <1 2>;
> > +                     };
> > +             };
> > +     };
> > +};
> > +
> >  &sai3 {
> >       pinctrl-names = "default";
> >       pinctrl-0 = <&pinctrl_sai3>;
> > @@ -209,6 +259,14 @@ MX8MM_IOMUXC_SAI3_RXFS_GPIO4_IO28        0x41
> >               >;
> >       };
> >
> > +     pinctrl_ov5640: ov5640grp {
> > +             fsl,pins = <
> > +                     MX8MM_IOMUXC_GPIO1_IO07_GPIO1_IO7               0x19
> > +                     MX8MM_IOMUXC_GPIO1_IO06_GPIO1_IO6               0x19
> > +                     MX8MM_IOMUXC_GPIO1_IO14_CCMSRCGPCMIX_CLKO1      0x59
> > +             >;
> > +     };
> > +
> >       pinctrl_pcal6414: pcal6414-gpiogrp {
> >               fsl,pins = <
> >                       MX8MM_IOMUXC_SAI2_MCLK_GPIO4_IO27               0x19
>
> --
> Regards,
>
> Laurent Pinchart