Re: DS1307 on NetBSD 9 RPI2 and RPI3

[Brad Spencer <brad%anduin.eldar.org@localhost>]

Jason Thorpe <thorpej%me.com@localhost> writes:

>> On Apr 23, 2020, at 11:57 AM, Brad Spencer <brad%anduin.eldar.org@localhost> wrote:
>> 
>> Michael van Elst <mlelstv%serpens.de@localhost> writes:
>> 
>> [snip]
>> 
>> Thanks...  I still can't get it to work, but the information was
>> helpful...
>> 
>> I have a overlay with this in it:
>> 
>> /dts-v1/;
>> 
>> / {
>>        compatible = "brcm,bcm2835-i2c";
>
> Your compatible string should match one of the root node's compatible strings, so:
>
> 	compatible = "brcm,bcm2835";
>
> (Or "brcm,bcm2836" or "brcm,bcm2837" or whatever.)
>
> ...but maybe it doesn't matter because...

Yes, I see (well, not really, but I am starting to get used to it)..  as
this is a RPI2 Model B, it probably should be brcm,bcm2836

>> This does prevent the uninteresting i2c buses from attaching and allows
>> just the one with the DS1307 on it to be available.  I can see the
>> device with i2cscan:
>> 
>> /dev/iic0: found device at 0x68
>> /dev/iic0: 1 devices found
>> 
>> ofctl
>> 00002e30:     /i2c@7e804000
>> 00002f28:       /dsrtc@68
>> 
>> 
>> [     1.000003] bsciic0 at simplebus1: Broadcom Serial Controller
>> [     1.000003] iic0 at bsciic0: I2C bus
>> [     1.000003] dsrtc at iic0 addr 0x68 not configured
>> 
>> Does not attach...  I know that the kernel has the dsrtc driver compiled
>> into it.
>
> What is the EXACT line in your kernel config file where "dsrtc" is declared?

Well, it would have been a hold over from the previous way this all
worked, so:

dsrtc* at iic2 addr 0x68 flags 1307

so, according to this, it would (might?) be looking for it on the wrong
bus I suppose?? Yes???  When I did this originally, there was some
reason or other I tied it to iic2 (sorry don't remember why)..  can one
get away with using iic? now??  It would seem that the addr and flags
are a bit redundant with what the overlay says to do, so I suppose one
should leave those off??  That seems to be permitted from what
sys/dev/i2c/files.i2c says.


> -- thorpej



-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org