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AHUB and few components have been pushed for upstream review. Though the changes are still under review, we can leverage the work done on upstream 5.x and use the same here on 5.4 kernel. This helps to align the downstream code. Any changes that happen because of upstream review can be cherry picked here. If we plan for any downstream changes, upstream patch needs to be pushed to keep the code in sync. As of today current snapshot is pulled from v3 of AHUB series, http://patchwork.ozlabs.org/project/linux-tegra/list/?series=159664 Above series was worked on later versions of linux-next and hence following are the changes required for porting back on 5.4 * tegra_pcm_new() and tegra_pcm_free() are exposed from tegra_pcm.c and component driver callbacks use these. * Callback functions required for snd_pcm_ops in component driver are implemented by tegra_pcm.c * With this ADMAIF driver need not register platform device with ASoC core. For components (AHUB, ADMAIF, I2S, DMIC and DSPK) the downsream code differs in few aspects from the code that was pushed for v3. Some of them are listed below. * I2S driver in downstream implements startup()/shutdown() calls for DAI, which does some setup related to pinconfig and regulators. The same is true for DMIC and DSPK drivers as well. * Downstream ADMAIF drivers makes bandwidth requests in startup/shutdown() calls and has helper function for dumping registers. It also has additional DAI interfaces which are used for ADSP audio. * Downstream AHUB driver has DAI interfaces for connecting to all other modules. These differences will be cherry-picked as and when it is necessary. Bug 2845498 Change-Id: Id374967ecae26f6b7334a959fb23308d383c15f2 Signed-off-by: Sameer Pujar <spujar@nvidia.com>