linux-kernel - [RFC PATCH 0/9] drivers: dma: Add support for dma-channel router

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Date:	Fri, 7 Mar 2014 17:46:07 +0530
From:	Sricharan R <r.sricharan@...com>
To:	<r.sricharan@...com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <dmaengine@...r.kernel.org>
CC:	<santosh.shilimkar@...com>, <rnayak@...com>, <nsekhar@...com>,
	<tony@...mide.com>, <linux@....linux.org.uk>,
	<vinod.koul@...el.com>, <dan.j.williams@...el.com>, <nm@...com>
Subject: [RFC PATCH 0/9] drivers: dma: Add support for dma-channel router

In some SoCs the dma request lines from the peripherals are
routed to the dma-controller through a crossbar. With this the
dma controller's available request lines are shared between the
peripherals.

This adds support to register the crossbar router associated with
a dma-channel and let the dma-controller driver map/unmap
the peripheral dma crossbar line to dma-controller's request
line.

This is on top of Russell's OMAP dma engine rework series

	http://www.spinics.net/lists/linux-omap/msg102969.html

Sricharan R (9):
  drivers: dma: omap-dma: Avoid hard-coding of the dma-request channels
  drivers: dma: of-dma: Add support for dma-request line routers
  drivers: dma: omap-dma: Add a seperate xlate function to get router
    data
  drivers: omap-dma: Add crossbar line as a resource to omap_chan
    structure
  drivers: dma: Add dma crossbar driver
  arm: dts: dra: Add dma crossbar node
  arm: dts: dra: Add dma-request router phandle to dma-specs
  arm: dra: Enable dma crossbar support on dra7xx
  arm: dts: dra7: Change the total dma-req numbers to crossbar channels

 .../devicetree/bindings/arm/omap/dma-crossbar.txt  |   26 +++
 arch/arm/boot/dts/dra7.dtsi                        |   47 +++--
 arch/arm/configs/omap2plus_defconfig               |    1 +
 drivers/dma/Kconfig                                |    7 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/of-dma.c                               |   82 +++++++-
 drivers/dma/omap-dma-xbar.c                        |  219 ++++++++++++++++++++
 drivers/dma/omap-dma-xbar.h                        |   32 +++
 drivers/dma/omap-dma.c                             |   72 ++++++-
 include/linux/of_dma.h                             |   22 ++
 10 files changed, 479 insertions(+), 30 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/omap/dma-crossbar.txt
 create mode 100644 drivers/dma/omap-dma-xbar.c
 create mode 100644 drivers/dma/omap-dma-xbar.h

-- 
1.7.9.5

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