Re: [PATCH 2/3] soundwire: qcom: add auto enumeration support

[Srinivas Kandagatla <srinivas.kandagatla@linaro.org>]

On 05/03/2021 16:19, Pierre-Louis Bossart wrote:
>>>
>>>
>>> The question is: what happens if that device is NOT described in the 
>>> Device Tree data? The loop over bus->slaves will not find this device 
>>> by comparing with known devID values, so the set_bit(i, 
>>> bus->assigned) will not happen.
>>
>> yes, that is true, There is no way we can assign a dev_number to the 
>> device which is not enumerated on the bus!
>>
>> Am sure this is the same behavior with soundwire core too, atleast 
>> form the code I can see it sets the assigned bit for only the devices 
>> that are enumerated on the bus! Not all the devices specified in DT!
>> Unless I missed something!
> 
> I am talking about the other way around, where a device is present and 
> enumerated on the bus but not listed in DT. In that case the hardware 
> did assign a device number but bus->assigned will not be set.

thanks for your patience!

Ah, I understand it now!, yes that part is missing!

adding Something like what core does in qcom driver should fix it!

if (!found) {
	sdw_slave_add(bus, &id, NULL);
	dev_err(bus->dev, "Slave Entry not found\n");
}

--srini