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



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