Info on how to modify device tree for EEPROM driver support

[zsaleeba]

Thanks for this very handy program. I want to use it to write to the EEPROM and I've configured my kernel with CONFIG_AT24=m. I've looked through the dts files and I'm uncertain about the changes I should make to enable the driver. Would it be possible to add an example in the README.md of the device tree changes necessary to enable it?

I'm using a TX2 NX (soc type 186) for what it's worth, which I believe has the EEPROM on i2c bus 7 at address 0x50.

Thanks

[madisongh]

I didn't include those details because they are different for each of the modules, and they can change across Linux kernel versions.

This is what I use in the device tree for my custom TX2-based device with the 4.9 kernel:

	i2c@c250000 {
		eeprom@50 {
			compatible = "atmel,24c02";
			reg = <0x50>;
		};
	};

This should work for the TX2-NX as well, since the CVM EEPROM is on the same I2C bus.

[zsaleeba]

Thanks. That's super useful to me.

I still think it'd be handy to include it in the README.md, even if just as an example. But whatever you think.

[Aufschlauer]

This is what I use in the device tree for my custom TX2-based device with the 4.9 kernel:

	i2c@c250000 {
		eeprom@50 {
			compatible = "atmel,24c02";
			reg = <0x50>;
		};
	};

Just to add another Jetson device:
I've successfully modified the Jetson Nano EEPROM with Kernel 4.9 with this device-tree patch:

+       i2c@7000c500 {
+               eeprom@50 {
+                       compatible = "atmel,24c02";
+                       reg = <0x50>;
+               };
+       };