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작성일 : 18-09-17 20:15
am5728 video capture dtb file
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Amritpreet Singh93
I will have only 1 driver to control the FPGA over SPI. Even if i make it a V4L2 subdevice based driver, how can i use it for multiple input ports

You will have to write one driver that should be able to register three v4l2 sub-device.

You can subscribe to linux-media mailing and also watch #v4l IRC channel and may get plenty of help there for your specific need.  

 

Amritpreet Singh93
And what should i add to device tree?

Device tree entry should like below -

&spi1 {

      status = "okay";

      clock-frequency = <xxxxx>;

 

      fpga_spi_drv@XX {

            compatible = "xxxxxx";

            reg = <xx>;

 

            reset-gpios = <&xx>;

            oscen-gpios = <&yy>;

            powerdown-gpios = <& >;

            bufen-gpios = <&>;

            camen-gpios = <&>;

 

            port1 {

                  cam1: endpoint {

                        remote-endpoint = <&vin4a>;

                        hsync-active = <1>;

                        vsync-active = <1>;

                        pclk-sample = <0>;

                        input-clock-freq = <xxxxxxx>;

                        pixel-clock-freq = <xxxxxxxx>;

                  };

            };

 

            Port2 {

                  Cam2: endpoint {

                        remote-endpoint = <&vin5a>;

                        hsync-active = <1>;

                        vsync-active = <1>;

                        pclk-sample = <0>;

                        input-clock-freq = <xxxxxxx>;

                        pixel-clock-freq = <xxxxxxxx>;

                  };

            };

 

 

            Port3 {

                  Cam3: endpoint {

                        remote-endpoint = <&vin6a>;

                        hsync-active = <1>;

                        vsync-active = <1>;

                        pclk-sample = <0>;

                        input-clock-freq = <xxxxxxx>;

                        pixel-clock-freq = <xxxxxxxx>;

                  };

            };

 

      };

 

&vin4a {

      status = "okay";

      endpoint {

            slave-mode;

            remote-endpoint = <&cam1>;

      };

};

 

 

&vin5a {

      status = "okay";

      endpoint {

            slave-mode;

            remote-endpoint = <&cam2>;

      };

};

 

&vin6a {

      status = "okay";

      endpoint {

            slave-mode;

            remote-endpoint = <&cam3>;

      };

};

 

&vip2 {

      status = "okay";

};

 

&vip3 {

      status = "okay";

};