Re: [PATCH 01/11] ASoC: dai_dma: remove slave_id field

[Lars-Peter Clausen <lars@metafoo.de>]

On 11/15/21 11:42 AM, Arnd Bergmann wrote:
> On Mon, Nov 15, 2021 at 11:14 AM Lars-Peter Clausen <lars@metafoo.de> wrote:
>> On 11/15/21 9:53 AM, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>>
>>> This field is never set, and serves no purpose, so remove it.
>> I agree that we should remove it. Its been legacy support code for a
>> while, but the description that there is no user is not right.
>>
>> The tegra20_spdif driver obviously uses it and that user is removed in
>> this patch. I think it makes sense to split that out into a separate
>> patch with a description why the driver will still work even with
>> slave_id removed. Maybe the best is to remove the whole tegra20_spdif
>> driver.
> Ok, I'll split out the tegra patch and try to come up with a better
> description for it. What I saw in that driver is it just passes down the
> slave_id number from a 'struct resource', but there is nothing in
> the kernel that sets up this resource.
>
> Do you or someone else have more information on the state of this
> driver? I can see that it does not contain any of_device_id based
> probing, so it seems that this is either dead code, the platform_device
> gets created by some other code that is no longer compatible with
> this driver.

I've looked into this a while back, when I tried to remove slave_id. And 
as far as I can tell there were never any in-tree users of this driver, 
even back when we used platform board files. Maybe somebody from Nvidia 
knows if there are out-of-tree users.

- Lars