linux-kernel - Re: [PATCH 0/3] bus: Add support for Tegra210 ACONNECT

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Message-ID: <572367E7.10207@nvidia.com>
Date:	Fri, 29 Apr 2016 14:55:51 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
CC:	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH 0/3] bus: Add support for Tegra210 ACONNECT

Ignore this, I ballsed it up!

On 29/04/16 14:46, Jon Hunter wrote:
> Add support for the ACONNECT bus which is part of the audio sub-system
> on Tegra210.
> 
> I did look to see if we could use the simple-pm-bus infrastructure for
> this, however, in the end I found that it did was not a good fit because
> of the way clocks for the bus are handled. The simple-pm-bus is tightly
> coupled to the genpd subsystem and is reliant on the power-domain
> associated with the bus to have the flag GENPD_FLAG_PM_CLK set and uses
> the genpd function pointer, attach_dev(), as a hook to populate the
> clocks. For Tegra this does not work because the power-domains are
> instantiated from device-tree rather than platform code. In this case
> for Tegra it is simpler to keep the clock management of devices within
> the power-domain separated from the power-domain itself.
> 
> Jon Hunter (2):
>   dt-bindings: bus: Add documentation for Tegra210 ACONNECT
>   bus: Add support for Tegra ACONNECT
> 
> Shardar Shariff Md (1):
>   dmaengine: tegra-apb: proper default init of channel slave_id
> 
>  .../bindings/bus/nvidia,tegra210-aconnect.txt      |  45 ++++++++
>  drivers/bus/Kconfig                                |   9 ++
>  drivers/bus/Makefile                               |   1 +
>  drivers/bus/tegra-aconnect.c                       | 113 +++++++++++++++++++++
>  drivers/dma/tegra20-apb-dma.c                      |  16 ++-
>  5 files changed, 182 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt
>  create mode 100644 drivers/bus/tegra-aconnect.c