On 4/16/23 10:01, Diederik de Haas wrote:
On Sunday, 16 April 2023 04:47:37 CEST Rick Thomas wrote:I've got a Raspberry Pi 4B (4GB) with a DS3231 RTC module. I can make the combo work with Ubuntu and RaspberryPI-OS. I'd like to try it with the plain-vanilla Debian from <https://raspi.debian.net/tested-images/> but I can't find instructions for activating the I2C and RTC hardware in that OS.Documentation/devicetree/bindings/rtc/rtc-ds1307.yaml in the kernel source describes how one could use it ('compatible = "maxim,ds3231"' for DS3231). I think you should make a DeviceTree Overlay, but I don't know how to do that.
An overlay is the nice way to add the RTC to the system. With the device trees provided by Debian this is a bit more complicated than with RaspberryPI-OS, because they are not compiled using dtc -@.
If the sysfs stuff that Georg Gast suggested works, I can help you to create a dt overlay.
Best regards Uwe
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