I use the following device tree fragment to set up my battery backed
DS1307. I imagine all you have to do for the 3232 is change the compatible
parameter.
&i2c2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c2_pins>;
clock-frequency = <100000>;
cape_rtc0: cape_rtc0@68 {
compatible = "maxim,ds1307";
reg = <0x68>;
};
};
On Wednesday, July 11, 2018 at 6:44:50 AM UTC-5, Neil Cobbett wrote:
>
>
> HI,
>
> I'm trying to get a battery backed RTC chip to work with the Beaglebone.
> It works on 4.14 kernel but I am trying to do the same on 3.8 kernel and I
> can't get it to appear as a device in /dev
>
> So far I have the device tree mappings for BB-I2C1 installed. (Which is
> referenced as i2c-2 - a known issue that is fixed in kernel 4). This seems
> to be ok as I can see the device:
>
> root@beaglebone:~# i2cdetect -r 2
> WARNING! This program can confuse your I2C bus, cause data loss and worse!
> I will probe file /dev/i2c-2 using read byte commands.
> I will probe address range 0x03-0x77.
> Continue? [Y/n] Y
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: -- -- -- -- -- -- -- -- -- -- -- -- --
> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
> 70: -- -- -- -- -- -- -- --
>
> I mount it with:
>
> echo ds3232 0x68 > /sys/class/i2c-adapter/i2c-2/new_device
>
> dmesg shows:
>
> [ 7242.287395] i2c i2c-2: new_device: Instantiated device ds3232 at 0x68
>
> However a new device /dev/rtc1 is not created and only the rtc built into
> the BBB is visable.
>
> I'n not sure what to try next... Can anyone help?
>
> Neil
>
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