[PATCH v4 0/2] powerpc/512x: add LocalPlus Bus FIFO device driver

[Alexander Popov <alex.popov@linux.com>]

This driver for Freescale MPC512x LocalPlus Bus FIFO (called SCLPC
in the Reference Manual) allows Direct Memory Access transfers
between RAM and peripheral devices on LocalPlus Bus.

Changes in v3:
 - resource usage in probe() is fixed;
 - driver methods are made safe against remove();
 - dma_request_slave_channel() is used to get DMA channel number from
    the device tree;
 - chip select number concerned with the DMA transaction is determined
    from 'localbus' device tree node information;
 - register set is described as a structure;
 - symbolic names are given to shift counts to keep magic numbers
    out of the code;
 - choosing values for LPBFIFO BPT (bytes per transfer) and DMA maxburst
    is improved, so DMA transfer size has increased for some cases;
 - device tree binding for LPBFIFO is documented;
 - Kconfig and Makefile are improved;
 - email address "a13xp0p0v88@gmail.com" is changed to a more pleasant
    alias "alex.popov@linux.com".

Changes in v4:
 - the race condition is fixed;
 - plenty of style fixes are made;
 - devm_* functions and EPROBE_DEFER are used in probe().

Alexander Popov (2):
  powerpc/512x: add LocalPlus Bus FIFO device driver
  powerpc/512x: add a device tree binding for LocalPlus Bus FIFO

 .../bindings/powerpc/fsl/mpc512x_lpbfifo.txt       |  21 +
 arch/powerpc/boot/dts/mpc5121.dtsi                 |  11 +-
 arch/powerpc/boot/dts/mpc5125twr.dts               |  11 +-
 arch/powerpc/configs/mpc512x_defconfig             |   1 +
 arch/powerpc/include/asm/mpc5121.h                 |  59 +++
 arch/powerpc/platforms/512x/Kconfig                |   6 +
 arch/powerpc/platforms/512x/Makefile               |   1 +
 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c      | 539 +++++++++++++++++++++
 8 files changed, 646 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/powerpc/fsl/mpc512x_lpbfifo.txt
 create mode 100644 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c

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1.9.1