[PATCH v7 0/5] Device Bus support for Marvell EBU SoC

[Ezequiel Garcia]

This patchset continues the effort to add Device Bus support
on Marvell EBU SoC.

If you're reading this for the first time you can grab the full details here:

  http://www.spinics.net/lists/arm-kernel/msg236151.html

This new version changes the way each chip select is described in the DT.
Now there's a separate node for each Device Bus chip select, like this:

	devbus-bootcs at d0010400 {
		compatible = "marvell,mvebu-devbus";
		reg = <0xd0010400 0x8>;
		ranges = <0 0xf0000000 0x8000000>; /* @addr 0xf000000, size 0x8000000 */

		device at 0 {
			reg = <0 0x8000000>;
		}
	};

	// ...

	devbus-cs1 at d0010410 {
		compatible = "marvell,mvebu-devbus";
		reg = <0xd0010410 0x8>;
	};

In particular, please note that once the window handling is properly added
to the DT, and we remove the mbus usage from this driver, in the above DT nodes
the ranges property value will have to be changed, but the ABI will be the same.

This applies on top of v3.9-rc6 with mbus patches applied, which can 
be found in Jason Cooper's mvebus/soc branch.

Changes from v6:
 
  * Rework shamelessly dirty 'ranges' parsing,
    as suggested by Jason Gunthorpe.

Changes from v5:
  Pointed out by both Arnd Bergmann and Jason Gunthorpe (thanks!):

  * Instead of translating the child address, parse the 'ranges'
    property. This is possible because the 'ranges' is mandatory
    and will a single entry to describing the address window.
    This allows to remove every reference to child nodes, and will
    be removed later, once the mbus binding is added.

  * Use of_platform_populate to register all child nodes.
    This way we solve the one-child only constraint present
    in the previous v5 of this series.

  * Rework the driver registration. Now there's a module_init()
    to register the platform driver, but there's no module_exit()
    to unregister it. This is done because currently there's no
    function opposite to of_platform_populate() to unregister all
    devices from a DT tree.

Changes from v4:

  * Calculate the chip select from the base address
    and drop the 2-cell address size.
    Suggested by Arnd Bergmann and Jason Gunthorpe.

  * The mvebu driver can't be compiled as a module, since the mbus
    API is not exported yet, so remove that option.

  * Bunch of comments here and there...

Changes from v3:

  * Rename devbus,dev-width to devbus,bus-width and changed the
    parameter value from bytes to bits: <8>, <16>, ...
    Suggested by Arnd Bergmann.

  * As suggested by Jason Gunthorpe and agreed by Arnd Bergmann.
    Reworked the whole devbus child chip-select device tree design.
    Now there's a separate devbus at addr DT node for each controller
    chip select. The impact of this is:
      1. Timing parameters now go into the parent node.
      2. There can only be one child per devbus node.

  * Remove unneeded bank-width parameter read.

Changes from v2:

  * Replace the 'NOR' specific probe by a generic probe.
    Currently, we don't see anything specific to NOR in this driver.
    Suggested by Jason Gunthorpe.

  * Add a check to detect that every timing parameter is specified
    in the device tree node.
    Suggested by Jason Gunthorpe.

Changes from v1:

  * Added a remove() function to unregister childs and remove address windows,
    as suggested by Thomas Petazzoni.

  * Remove unneeded 'inline' prefix on functions as suggested by Thomas Petazzoni.

  * Timings parameters are now mandatory and expressed in picoseconds,
    as requested by Jason Gunthorpe.
    This is consistent with OMAP's GPMC dts binding.

  * Fix documentation as suggested by Jason Gunthorpe.

Thanks!

Ezequiel Garcia (5):
  drivers: memory: Introduce Marvell EBU Device Bus driver
  ARM: mvebu: Add Device Bus support for Armada 370/XP SoC
  ARM: mvebu: Add support for NOR flash device on Armada XP-GP board
  ARM: mvebu: Add support for NOR flash device on Openblocks AX3 board
  ARM: mvebu: Add Device Bus and CFI flash memory support to defconfig

 .../bindings/memory-controllers/mvebu-devbus.txt   | 156 ++++++++++
 arch/arm/boot/dts/armada-370-xp.dtsi               |  45 +++
 arch/arm/boot/dts/armada-xp-gp.dts                 |  29 ++
 arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts   |  29 ++
 arch/arm/configs/mvebu_defconfig                   |   7 +
 drivers/memory/Kconfig                             |  10 +
 drivers/memory/Makefile                            |   1 +
 drivers/memory/mvebu-devbus.c                      | 340 +++++++++++++++++++++
 8 files changed, 617 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/mvebu-devbus.txt
 create mode 100644 drivers/memory/mvebu-devbus.c

-- 
1.8.1.5