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

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Date:	Fri, 29 Apr 2016 14:53:44 +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>, Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH 0/3] bus: Add support for Tegra210 ACONNECT

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 (3):
  dt-bindings: bus: Add documentation for Tegra210 ACONNECT
  bus: Add support for Tegra ACONNECT
  arm64: tegra: Add ACONNECT bus node for Tegra210

 .../bindings/bus/nvidia,tegra210-aconnect.txt      |  45 ++++++++
 arch/arm64/boot/dts/nvidia/tegra210.dtsi           |  12 +++
 drivers/bus/Kconfig                                |   9 ++
 drivers/bus/Makefile                               |   1 +
 drivers/bus/tegra-aconnect.c                       | 113 +++++++++++++++++++++
 5 files changed, 180 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt
 create mode 100644 drivers/bus/tegra-aconnect.c

-- 
2.1.4