[PATCH v4 00/11] Support for AM33xx PWM Subsystem

[avinashphilip@ti.com (Philip, Avinash)]

In AM33xx PWM sub modules like ECAP, EHRPWM & EQEP are  integrated to
PWM subsystem. All these submodules shares the resources (clock) & has
a clock gating register in PWM Subsystem. This patch series creates a
parent PWM Subsystem driver to handle access synchronization of shared
resources & clock gating from PWM Subsystem configuration space.
Also Device tree nodes populated to support parent child relation
between PWMSS, ECAP & EHRPWM submodules.
In addition EHRPWM module requires explicit clock gating from control
module & is handled by patch #2 & 8.

As suggested by  Thierry for handling clock gating for PWM submodules
should handle with a global function. This requires config space
handling done independent from driver and is done at parent driver.

So the parent<->child relation adopted to handle
1. pm runtime synchronization
2. PWM subsystem common config space clock gating for PWM submodules.

Patches supports
- Driver support for parent child relation handled patch #1
- Optional EHRPWM tb clock in patch #2
- Parent child in HWMOD handled at patch #3
- Device tree binding support handled in patch #4, 6 &8
- pinctrl support in patch #5 & 7.
- DT node populated in patch #9 ,10 & 11.

This patch series based on omap_dt/for_3.8/dts_part2 and tested
on am335x-evm & am335x-evmsk.

It depends on [1]

1. https://lkml.org/lkml/2012/11/21/70
pwm: Device tree support for PWM polarity

Changes since v3:
	- Rebased on top of omap_dt/for_3.8/dts_part2
	- Add pwm backlight for am335xevm_sk
	- Moved tipwmss.h to pwm-tipwmss.h

Philip, Avinash (11):
  PWMSS: Add PWM Subsystem driver for parent<->child relationship
  ARM: am33xx: clk: Add optional clock for EHRPWM
  ARM: OMAP: AM33xx hwmod: Add parent-child relationship for PWM
    subsystem
  pwm: pwm-tiecap: Add device-tree binding support for APWM driver
  pwm: pwm-tiecap: pinctrl support
  pwm: pwm-tiehrpwm: Add device-tree binding support for EHRPWM driver
  pwm: pwm-tiehrpwm: pinctrl support
  pwm: pwm-tiehrpwm: Adding TBCLK gating support.
  ARM: dts: AM33XX: Add PWMSS device tree nodes
  ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evm
  ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evmsk

 .../devicetree/bindings/pwm/pwm-tiecap.txt         |   23 ++
 .../devicetree/bindings/pwm/pwm-tiehrpwm.txt       |   23 ++
 .../devicetree/bindings/pwm/pwm-tipwmss.txt        |   31 ++
 arch/arm/boot/dts/am335x-evm.dts                   |   23 ++
 arch/arm/boot/dts/am335x-evmsk.dts                 |   23 ++
 arch/arm/boot/dts/am33xx.dtsi                      |   84 ++++
 arch/arm/mach-omap2/clock33xx_data.c               |   37 ++
 arch/arm/mach-omap2/control.h                      |    8 +
 arch/arm/mach-omap2/omap_hwmod_33xx_data.c         |  419 +++++++++++++-------
 drivers/pwm/Kconfig                                |   11 +
 drivers/pwm/Makefile                               |    1 +
 drivers/pwm/pwm-tiecap.c                           |   50 +++-
 drivers/pwm/pwm-tiehrpwm.c                         |   65 +++-
 drivers/pwm/pwm-tipwmss.c                          |  143 +++++++
 drivers/pwm/pwm-tipwmss.h                          |   39 ++
 15 files changed, 835 insertions(+), 145 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-tiecap.txt
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-tipwmss.txt
 create mode 100644 drivers/pwm/pwm-tipwmss.c
 create mode 100644 drivers/pwm/pwm-tipwmss.h