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 = <®_dc1sw>;*/
/* eldo3-supply = <®_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。