ning

develop effort on Amlogic HW dec looks stopped, and not usable now. please forget this driver.

in fd6551 data sheet, page 7, it says: clk better lower than 100K. I don't know how to set i2c-rockchip or i2c-gpio to 100k or lower? i2c-gpio,delay-us = <10>; ? http://www.fdhisi.com/down/upload/20191023/1571794231.pdf

VDD has 3.3V.. I have no idea now.

use i2c1, error timeout, use gpio-i2c error no such device. let me check power VDD.

[ 23.946809] tm16xx 4-0034: Display initialized successfully i2c4 is bad, any address can have good write result.

i2c1 { /omit-if-no-ref/ i2c1_xfer: i2c1-xfer { rockchip,pins = /* i2c1_scl */ <0 RK_PB3 1 &pcfg_pull_none_smt>, /* i2c1_sda */ <0 RK_PB4 1 &pcfg_pull_none_smt>; }; }; phandle 0x35 is gpio0

it's easy to try fd655 and i2c-gpio. and I read Android dts many times, not findings. jianpian.dts

after read spec, 7 SEG pins for 7 LEDs (LAN, WIFI...etc) and 4 DIG pins control 4 digital. 5 DIG pins are controlled by 66h~6eh, while 4 digitals how to control seg pins? use 1 DIG pin? I guess Yes. each digital has 7 LEDs, and there also 7 Seg LED. write number to DIG register, at least 1 LED will on. OK. 1 DIG pin controls 1 digtal, and each digital has 7 seg, 1 seg connects to 1 SEG pin. there are 5 digitals (one virtual), and they share SEG pins. So let me check VDD.

I checked your code, the i2c address is correct, brightness register is correct. dig registers are correct. it should work, but no. I don't know why, let me check fd6551's VDD. if there no power, will it answer I2C command, I2C write should return -1, but no error in dmesg.

use sysfs leds interface to control it but it doesn't show any thing...

it's on i2c4. I don't see I2c error during probe. please let me know what to do next! &i2c4 { status = "okay"; vfd@24 { compatible = "fdhisi,fd6551"; reg = <0x24>; tm16xx,digits = [04 03 02 01]; tm16xx,segment-mapping = [03 01 02 06 04 05 00]; #address-cells = <2>; #size-cells = <0>; led@0,0 { reg = <0 0>; function = LED_FUNCTION_ALARM; }; led@0,1 { reg = <0 1>; function = LED_FUNCTION_USB; }; led@0,3 { reg = <0 3>; function = "play"; }; led@0,2 { reg = <0 2>; function = "pause"; }; led@0,4 { reg = <0 4>; function = "colon"; }; led@0,5 { reg = <0 5>; function = LED_FUNCTION_LAN; }; led@0,6 { reg = <0 6>; function = LED_FUNCTION_WLAN; }; }; };

the correct part is VFD device is fdhisi,fd6551, I see the chip on board. but the i2c gpios are icorrect..

OK, I will try this suggestion.

I don't have vfd.conf. I can try the drivers one by one, then try to write a conf.

I'm happy to and will test your driver on JianPian Rk3566 TV box.