[PATCH v9 0/3] ahci: enable ahci sata support on imx6q

[Richard Zhu <richard.zhuhongxing@gmail.com>]

v9: add imx6q specific ahci sata support
  - Let ahci_imx depend on the MFD_SYSCON, to fix the build error
  reported by Randy.
  "
  on i386.
  # CONFIG_MFD_SYSCON is not set

  when ahci_imx.c is built as a loadable module:
  ERROR: "syscon_regmap_lookup_by_compatible" [drivers/ata/ahci_imx.ko] undefined!
  "
  -
v8: http://www.spinics.net/lists/linux-ide/msg45798.html
  - Regarding to Tejun's comments, rename the sata_imx driver
  to be ahci_imx
  - Add Shawn's ack and review signoff.
  - 

v7: http://www.spinics.net/lists/linux-ide/msg45738.html
  Thanks to Sergei Shtylyow and Shawn.
  - According to ePAPR [1] section 2.2.2, re-name
  the node from 'ahci' to 'sata'
  - Move the initialization of the ahb clock of the private
  data to the probe function.
  - Remove the platform_set_drvdata(..., NULL), and devm_clk_put
  (..., ...).
  - 

v6: http://www.spinics.net/lists/linux-ide/msg45719.html
  Thanks for Shawn's comments.
  - Speicify the ahb clock in the sata related dts changes.
  - Move the initialization of the sata PHY clock of the private
  data to the probe function.
  - Remove the empty device release function.
  - In order to be more readable, rename the imx_dev/imx_ahci_pdev
  to be ahci_dev/ahci_pdev, and do some other changes, such as typo
  error, more readable name of the variable.
  - 

v5: http://www.spinics.net/lists/linux-ide/msg45712.html
  - Fix the wrong referrence usage of the private data.
  - Use the private data to contain the poninter of the PHY
  signals adjustment window(gpr)
  - Tested on imx6q sd board.
  - 

v4: http://www.spinics.net/lists/linux-ide/msg45699.html
  Thanks for the review comments provided by Sascha, and Alexander.
  - Use the private data and keep a pointer to the PHY clock.
  - Don't use the global platform device variable, because that
  it would make the driver broken for mutiple instances.
  - Don't do the "writel" with assignment.
  - Other minor changes, such as print the error code when printing
  error message, use a u32 type to store readl results, and so on.

v3: http://www.spinics.net/lists/linux-ide/msg45688.html
  - Keep arch/arm and ahci_platform driver clean.
  - Add the sata_imx standalone driver contained all the
  specific setup
  - Add the release function, support the loadable module
  driver.
  - Tested on imx6q sd board.

v2: http://www.spinics.net/lists/linux-ide/msg45666.html 
 - Setup standalone imx ahci sata driver, because of
 the misalignments of the bits definition of the HBA register.
 - Replace the node by the label in the board dts.
 - 

v1: http://www.spinics.net/lists/linux-ide/msg45581.html
 - add imx6q specific ahci sata support to arch/arm/mach-imx/mach-imx6q.c

These patches is based on imx/dt branch of
"http://git.linaro.org/git-ro/people/shawnguo/linux-2.6.git"

[v9 1/3] ARM: dtsi: enable ahci sata on imx6q platforms
[v9 2/3] ARM: imx6q: update the sata bits definitions of gpr13
[v9 3/3] ahci_imx: add ahci sata support on imx platforms

arch/arm/boot/dts/imx6q-sabreauto.dts       |    4 +
arch/arm/boot/dts/imx6q-sabrelite.dts       |    4 +
arch/arm/boot/dts/imx6q-sabresd.dts         |    4 +
arch/arm/boot/dts/imx6q.dtsi                |    9 +
drivers/ata/Kconfig                         |    9 +
drivers/ata/Makefile                        |    1 +
drivers/ata/ahci_imx.c                      |  236 +++++++++++++++++++++++++++
include/linux/mfd/syscon/imx6q-iomuxc-gpr.h |  121 ++++++++++----
8 files changed, 351 insertions(+), 37 deletions(-)