topic Re: Read EEPROM time out in i.MX Processors

Read EEPROM time out

wangtsungli — Mon, 24 Dec 2018 06:26:10 GMT

Hi Community,

I'm working on i.MX6 sabre-SD Quad self-designed platform and use yocto 2.0 to build my image.

According to my hardware designed, I use ATMEL series AT24C16 as my EEPROM.

Below is my DTSI settings.

&i2c1 {
clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c1>;
status = "okay";
sgtl5000: sgtl5000@0a {
compatible = "fsl,sgtl5000";
reg = <0x0a>;
clocks = <&clks IMX6QDL_CLK_CKO>;/*201*/
VDDA-supply = <&reg_3p3v>;
VDDIO-supply = <&reg_3p3v>;
};
at24@50 {
compatible = "at24,24c16";
pagesize = <16>;
reg = <0x50>;
};
};

I try to cat content of EEPROM with below command.

cat /sys/devices/soc0/soc/2100000.aips-bus/21a0000.i2c/i2c-0/0-0050/eeprom

However, I will get below error.

Connection timed out

Why it will time out?

How can I fix this problem?

Did my DTSI setting right?

Thanks in advance!

Re: Read EEPROM time out

igorpadykov — Tue, 25 Dec 2018 23:27:35 GMT

Hi tsung

one can check i2c signals with oscilloscope and try to debug it

in probe function of eeprom driver. May be useful to check similar thread:

iMX6 - EEPROM(AT2432) Accessing From user space

Best regards
igor
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Re: Read EEPROM time out

wangtsungli — Thu, 17 Jan 2019 18:47:51 GMT

Thanks for the help.

I had found that our hardware designed was wrong.

So I can't read or write EEPROM.