[PATCH v5 0/8] Reset controller API to reset IP modules on i.MX5 and i.MX6

[Philipp Zabel]

The system reset controller (SRC) on i.MX51, i.MX53, and i.MX6q controls
reset lines to the GPU, VPU, IPU, and OpenVG IP modules.

The following patches add a simple API for devices to request being reset
by separate reset controller hardware and implements the reset signal
device tree binding proposed by Stephen Warren. Contrary to Tegra hardware,
the i.MX SRC contains self-deasserting reset registers, so I've included
both ops to manually assert/deassert a reset line, as well as a "reset"
operation that is supposed to assert the reset line and wait for it to
deassert.

The i.MX SRC is enhanced to provide a reset controller and the IPU driver
is made to request being reset by calling the device_reset(&pdev->dev)
convenience wrapper during probing.

Changes since v4:
 - removed flags parameter from .of_xlate / of_reset_simple_xlate
 - warn also if reset_spec->args_count > rcdev->of_reset_n_cells
 - unlock list mutex only after try_module_get
 - tighten devm_reset_control_match a bit

regards
Philipp

---
 .../devicetree/bindings/reset/fsl,imx-src.txt      |  49 ++++
 .../devicetree/bindings/reset/gpio-reset.txt       |  37 +++
 Documentation/devicetree/bindings/reset/reset.txt  |  75 ++++++
 .../bindings/staging/imx-drm/fsl-imx-drm.txt       |   3 +
 arch/arm/boot/dts/imx51.dtsi                       |   7 +
 arch/arm/boot/dts/imx53.dtsi                       |   7 +
 arch/arm/boot/dts/imx6q.dtsi                       |   1 +
 arch/arm/boot/dts/imx6qdl.dtsi                     |   4 +-
 arch/arm/mach-imx/Kconfig                          |   3 +
 arch/arm/mach-imx/mm-imx5.c                        |   2 +
 arch/arm/mach-imx/src.c                            |  69 ++++-
 drivers/Kconfig                                    |   2 +
 drivers/Makefile                                   |   3 +
 drivers/reset/Kconfig                              |  26 ++
 drivers/reset/Makefile                             |   2 +
 drivers/reset/core.c                               | 297 +++++++++++++++++++++
 drivers/reset/gpio-reset.c                         | 208 +++++++++++++++
 drivers/staging/imx-drm/ipu-v3/ipu-common.c        |  12 +-
 include/linux/reset-controller.h                   |  51 ++++
 include/linux/reset.h                              |  17 ++
 20 files changed, 870 insertions(+), 5 deletions(-)