This will work on Raspberry Pi OS 2021-01-12 (related DT files were changed in later release).
Copy the binary device tree overlay file to /boot/overlays/:
sudo cp ov7251cam0.dtbo /boot/overlays/ov7251cam0.dtboEnable the overlay in boot/config.txt:
dtoverlay=ov7251cam0
Reboot the RPi with sudo reboot. The camera driver should run.
To compile the device tree from source use dts:
dtc -I dts -O dtb -o ov7251cam0.dtbo ov7251cam0-overlay.dtsLink to base overlay file: ov7251-overlay.dts.
| // SPDX-License-Identifier: GPL-2.0-only | |
| // Definitions for OV7251 camera module on VC I2C bus | |
| /dts-v1/; | |
| /plugin/; | |
| //#include <dt-bindings/gpio/gpio.h> | |
| /{ | |
| compatible = "brcm,bcm2835"; | |
| fragment@0 { | |
| target = <&i2c_vc>; | |
| __overlay__ { | |
| #address-cells = <1>; | |
| #size-cells = <0>; | |
| status = "okay"; | |
| ov7251: ov7251@60 { | |
| compatible = "ovti,ov7251"; | |
| reg = <0x60>; | |
| status = "okay"; | |
| clocks = <&ov7251_clk>; | |
| clock-names = "xclk"; | |
| clock-frequency = <24000000>; | |
| vdddo-supply = <&ov7251_dovdd>; | |
| vdda-supply = <&ov7251_avdd>; | |
| vddd-supply = <&ov7251_dvdd>; | |
| enable-gpios = <&gpio 41 0>; | |
| port { | |
| ov7251_0: endpoint { | |
| remote-endpoint = <&csi0_ep>; | |
| clock-lanes = <0>; | |
| data-lanes = <1>; | |
| clock-noncontinuous; | |
| link-frequencies = | |
| /bits/ 64 <456000000>; | |
| }; | |
| }; | |
| }; | |
| }; | |
| }; | |
| fragment@1 { | |
| target = <&csi0>; | |
| __overlay__ { | |
| status = "okay"; | |
| port { | |
| csi0_ep: endpoint { | |
| remote-endpoint = <&ov7251_0>; | |
| data-lanes = <1>; | |
| }; | |
| }; | |
| }; | |
| }; | |
| fragment@2 { | |
| target = <&i2c0if>; | |
| __overlay__ { | |
| status = "okay"; | |
| }; | |
| }; | |
| fragment@3 { | |
| target-path="/"; | |
| __overlay__ { | |
| ov7251_avdd: fixedregulator@0 { | |
| compatible = "regulator-fixed"; | |
| regulator-name = "ov7251_avdd"; | |
| regulator-min-microvolt = <2800000>; | |
| regulator-max-microvolt = <2800000>; | |
| }; | |
| ov7251_dovdd: fixedregulator@1 { | |
| compatible = "regulator-fixed"; | |
| regulator-name = "ov7251_dovdd"; | |
| regulator-min-microvolt = <1800000>; | |
| regulator-max-microvolt = <1800000>; | |
| }; | |
| ov7251_dvdd: fixedregulator@2 { | |
| compatible = "regulator-fixed"; | |
| regulator-name = "ov7251_dvdd"; | |
| regulator-min-microvolt = <1200000>; | |
| regulator-max-microvolt = <1200000>; | |
| }; | |
| ov7251_clk: ov7251-clk { | |
| compatible = "fixed-clock"; | |
| #clock-cells = <0>; | |
| clock-frequency = <24000000>; | |
| }; | |
| }; | |
| }; | |
| fragment@4 { | |
| target = <&i2c0mux>; | |
| __overlay__ { | |
| status = "okay"; | |
| }; | |
| }; | |
| fragment@5 { | |
| target-path="/__overrides__"; | |
| __overlay__ { | |
| cam0-pwdn-ctrl = <&ov7251>,"enable-gpios:0"; | |
| cam0-pwdn = <&ov7251>,"enable-gpios:4"; | |
| }; | |
| }; | |
| }; |
This should now be obsolete, alternative is
dtoverlay=ov7251,cam0
https://gist.github.com/kralo/5e489247d23dd13f4564fd6baa443416