D1s如何使用cvbs IN,，最近有个板子需要有个项目想尝试一下

[xiaoxiaohai]

哪里可以找到相关文档？

[YuzukiTsuru]

melis有文档，linux不知道能不能用

RTOS_TVD_开发指南.pdf

[whycan]

驱动勾选 CONFIG_VIDEO_SUNXI_TVD=y

board.dts 配置好tvd（可能已经配好了）：

/*
tvd configuration
used                   (create device, 0: do not create device, 1: create device)
agc_auto_enable        (0: agc manual mode,agc_manual_value is valid; 1: agc auto mode)
agc_manual_value       (agc manual value, default value is 64)
cagc_enable            (cagc        0: disable, 1: enable)
fliter_used            (3d fliter   0: disable, 1: enable)
support two PMU power  (tvd_power0, tvd_power1)
support two GPIO power (tvd_gpio0, tvd_gpio1)
NOTICE: If tvd need pmu power or gpio power,params need be configured under [tvd]
tvd_sw                 (the switch of all tvd driver.)
tvd_interface          (0: cvbs, 1: ypbpr,)
tvd_format             (0:TVD_PL_YUV420 , 1: MB_YUV420, 2: TVD_PL_YUV422)
tvd_system             (0:ntsc, 1:pal)
tvd_row                (total row number in multi channel mode 1-2)
tvd_column             (total column number in multi channel mode 1-2)
tvd_channelx_en        (0:disable, 1~4:position in multi channel mode,In single channel
                       mode,mean enable)
tvd_row*tvd_column is the total tvd channel number to be used in multichannel mode
+--------------------+--------------------+
|                    |                    |
|                    |                    |
|         1          |         2          |
|                    |                    |
|                    |                    |
+--------------------+--------------------+
|                    |                    |
|                    |                    |
|         3          |         4          |
|                    |                    |
|                    |                    |
+--------------------+--------------------+
*/

&tvd {
        tvd_sw          = <1>;
        tvd_interface   = <0>;
        tvd_format      = <0>;
        tvd_system      = <1>;
        tvd_row         = <1>;
        tvd_column      = <1>;
        tvd_channel0_en = <1>;
        tvd_channel1_en = <0>;
        tvd_channel2_en = <0>;
        tvd_channel3_en = <0>;
        /*tvd_gpio0 = <&pio PD 22 GPIO_ACTIVE_HIGH>;*/
        /*tvd_gpio1 = <&pio PD 23 GPIO_ACTIVE_HIGH>;*/
        /*tvd_gpio2 = <&pio PD 24 GPIO_ACTIVE_HIGH>;*/
        /*      dc1sw-supply = <&reg_dc1sw>;*/
        /*      eldo3-supply = <&reg_eldo3>;*/
        /*tvd_power0      = "dc1sw"*/
        /*tvd_power1      = "eldo3"*/
};

&tvd0 {
        used                    = <1>;
        agc_auto_enable         = <1>;
        agc_manual_value        = <64>;
        cagc_enable             = <1>;
        fliter_used             = <1>;
};

linux启动后会生成 /dev/video4：

root@TinaLinux:/# ls /dev/video4
/dev/video4

测试一吓：

root@TinaLinux:/# cat /dev/video4
[tvd] tvd_read:1857 tvd_read: tvd is not generating!
cat: read error: Invalid argument

嗯， 看日志应该就是TV输入了。