T113S使用外置RTC问题

y97788 LV 4

T113S使用i2c接口连接外置RTC初始化失败，这个是什么原因

[    4.429716] sunxi-i2c sunxi-i2c2: sunxi-i2c2 supply twi not found, using dummy regulator
 [    4.444395] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[    4.452364] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x51)
[    4.459795] rtc-pcf8563 2-0051: pcf8563_write_block_data: err=-22 addr=0e, data=03
[    4.468327] rtc-pcf8563 2-0051: pcf8563_probe: write error
[    4.474816] rtc-pcf8563: probe of 2-0051 failed with error -5
[    4.481305] sunxi-i2c sunxi-i2c2: probe success
[    4.488591] sunxi-i2c sunxi-i2c3: sunxi-i2c3 supply twi not found, using dummy regulator
[    4.501228] sunxi-i2c sunxi-i2c3: probe success

使用longanLinux kernel5.4设备树配置

 twi2_pins_a: twi2@0 {
 	pins = "PG14", "PG15";
 	function = "twi2";
 	drive-strength = <10>;
 };

 twi2_pins_b: twi2@1 {
 	pins = "PG14", "PG15";
 	function = "gpio_in";
 };

 &twi2 {
 clock-frequency = <400000>;
 pinctrl-0 = <&twi2_pins_a>;
 pinctrl-1 = <&twi2_pins_b>;
 pinctrl-names = "default", "sleep";
 twi_drv_used = <1>;
 dmas = <&dma 45>, <&dma 45>;
 dma-names = "tx", "rx";
 status = "okay";
 pcf8563: pcf8563@51 {
 	compatible = "nxp,pcf8563";
 	reg = <0x51>;
 	#clock-cells = <0>;
 };

};

柚木鉉 LV 9

i2cdetect看看，记得loglevel=1

y97788 LV 4

This post is deleted!

y97788 LV 4

@yuzukitsuru #

`i2cdetect -y 2

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
[14014.608115] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.620277] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3)
00:          [14014.627829] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
-- [14014.636662] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4)
-- [14014.644440] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.652705] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5)
-- [14014.660196] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.668270] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6)
-- [14014.675835] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.683910] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x7)
-- [14014.691383] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.699452] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x8)
-- [14014.706936] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.715014] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x9)
-- [14014.723052] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.731113] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xa)
-- [14014.738625] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.746699] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xb)
-- [14014.754189] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.762267] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xc)
-- [14014.769726] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.777807] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xd)
-- [14014.785293] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.793369] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xe)
-- [14014.800828] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.808904] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0xf)
--
[14014.816423] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
10: [14014.824652] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x10)
-- [14014.832577] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.840647] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x11)
-- [14014.848242] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.856325] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x12)
-- [14014.863973] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.872047] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x13)
-- [14014.879609] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.887688] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x14)
-- [14014.895273] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.903351] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x15)
-- [14014.910911] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.918989] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x16)
-- [14014.926569] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.934648] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x17)
-- [14014.942227] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.950303] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x18)
-- [14014.957887] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.965966] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x19)
-- [14014.973543] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.981619] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1a)
-- [14014.989202] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14014.997285] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1b)
-- [14015.004936] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.013009] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1c)
-- [14015.020573] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.028648] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1d)
-- [14015.036239] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.044316] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1e)
-- [14015.051882] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.059952] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x1f)
--
[14015.067583] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
20: [14015.075812] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x20)
-- [14015.083736] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.091808] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x21)
-- [14015.099401] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.107477] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x22)
-- [14015.115055] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.123133] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x23)
-- [14015.130689] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.138771] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x24)
-- [14015.146426] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.154498] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x25)
-- [14015.162095] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.170137] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x26)
-- [14015.177717] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.185796] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x27)
-- [14015.193380] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.201454] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x28)
-- [14015.209041] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.217118] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x29)
-- [14015.224696] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.232772] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2a)
-- [14015.240744] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.248808] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2b)
-- [14015.256409] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.264484] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2c)
-- [14015.272060] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.280122] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2d)
-- [14015.287708] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.295785] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2e)
-- [14015.303368] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.311443] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x2f)
--
[14015.319044] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
30: [14015.327278] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x30)
-- [14015.335200] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.343276] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x31)
-- [14015.350835] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.358905] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x32)
-- [14015.366594] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.374665] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x33)
-- [14015.382253] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.390327] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x34)
-- [14015.397921] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.405997] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x35)
-- [14015.413581] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.421657] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x36)
-- [14015.429247] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.437325] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x37)
-- [14015.444909] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.452985] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x38)
-- [14015.460542] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.468620] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x39)
-- [14015.476196] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.484271] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3a)
-- [14015.491826] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.499910] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3b)
-- [14015.507555] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.515630] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3c)
-- [14015.523215] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.531287] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3d)
-- [14015.538877] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.546958] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3e)
-- [14015.554538] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.562613] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x3f)
--
[14015.570187] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
40: [14015.578420] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x40)
-- [14015.586342] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.594419] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x41)
-- [14015.601975] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.610053] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x42)
-- [14015.617630] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.625705] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x43)
-- [14015.633392] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.641463] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x44)
-- [14015.649052] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.657130] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x45)
-- [14015.664714] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.672792] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x46)
-- [14015.680350] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.688427] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x47)
-- [14015.696024] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.704102] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x48)
-- [14015.711668] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.719750] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x49)
-- [14015.727345] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.735419] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4a)
-- [14015.742996] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.751071] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4b)
-- [14015.758658] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.766739] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4c)
-- [14015.774391] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.782465] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4d)
-- [14015.790026] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.798105] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4e)
-- [14015.805684] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.813763] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x4f)
--
[14015.821339] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
50: [14015.829576] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x50)
-- [14015.837495] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.845571] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x51)
-- [14015.853153] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.861226] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x52)
-- [14015.868811] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.876887] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x53)
-- [14015.884469] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.892543] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x54)
-- [14015.900098] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.908181] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x55)
-- [14015.915827] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.923900] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x56)
-- [14015.931460] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.939538] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x57)
-- [14015.947497] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.955561] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x58)
-- [14015.963169] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.971235] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x59)
-- [14015.978828] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14015.986906] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5a)
-- [14015.994489] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.002562] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5b)
-- [14016.010121] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.018199] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5c)
-- [14016.025783] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.033863] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5d)
-- [14016.041426] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.049509] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5e)
-- [14016.057097] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.065170] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x5f)
--
[14016.072881] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
60: [14016.081107] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x60)
-- [14016.089053] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.097129] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x61)
-- [14016.104721] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.112787] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x62)
-- [14016.120347] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.128422] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x63)
-- [14016.136001] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.144079] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x64)
-- [14016.151637] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.159716] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x65)
-- [14016.167294] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.175376] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x66)
-- [14016.182954] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.191032] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x67)
-- [14016.198617] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.206702] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x68)
-- [14016.214349] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.222424] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x69)
-- [14016.229982] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.238059] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6a)
-- [14016.245641] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.253716] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6b)
-- [14016.261275] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.269352] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6c)
-- [14016.276937] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.285013] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6d)
-- [14016.292594] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.300668] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6e)
-- [14016.308253] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.316336] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x6f)
--
[14016.323930] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
70: [14016.332164] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x70)
-- [14016.340077] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.348156] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x71)
-- [14016.355806] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.363882] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x72)
-- [14016.371446] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.379518] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x73)
-- [14016.387101] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.395174] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x74)
-- [14016.402750] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.410828] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x75)
-- [14016.418414] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.426492] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x76)
-- [14016.434073] sunxi-i2c sunxi-i2c2: drv-mode: Timeout when sending 9th SCL clk
[14016.442151] sunxi-i2c sunxi-i2c2: drv-mode: xfer failed (dev addr:0x77)
--

柚木鉉 LV 9

@y97788 调低loglevel=1
现在没法看了

y97788 LV 4

@yuzukitsuru

# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

柚木鉉 LV 9

@y97788 没有扫到i2c设备，检查下线有没有jie dui

whycan晕哥 LV 9

@y97788
对一下手册，看下 PG14/PG15 对应的复用寄存器，用devmem把这个寄存器读出来，看下这两条腿的当前复用状态是不是I2C2，如果不是，用devmem 写回去，然后再用i2cdetect扫描试一试。

y97788 LV 4

@whycan cat pinmux-pins，配置好像没问题。

whycan晕哥 LV 9

@y97788

那检查硬件电路，逻辑分析仪伺候。

y97788 LV 4

@whycan devmem 查看了引脚寄存器配置两个引脚当前配置为gpio，不是i2c2, 处于设备树配置的sleep。用devmem修改了寄存器的值，再用i2cdetect也是扫不到设备。

whycan晕哥 LV 9

@y97788
说明设备树、驱动、硬件都可能有点问题，要继续跟踪一下。

y97788 LV 4

@whycan 将设备树这三行注释掉就好了，

  twi_drv_used = <1>;
 dmas = <&dma 45>, <&dma 45>;
 dma-names = "tx", "rx";

whycan晕哥 LV 9

@y97788
强，怎么跟踪到的？

TsMax LV 5

@y97788
强，有用

dream LV 6

@y97788 这啥原理？