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 & 6. Patch #4 & 5 submitted is a second revision as suggested by Thierry for handling clock gating 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 - DT node populated in patch #7-8. This patch series based on linux-next/20121102 and tested on AM335x-evm. It depends on [1] 1. https://lkml.org/lkml/2012/10/29/589 pwm: Device tree support for PWM polarity Philip, Avinash (8): 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-tiehrpwm: Add device-tree binding support for EHRPWM driver 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 .../devicetree/bindings/pwm/pwm-tiecap.txt | 22 + .../devicetree/bindings/pwm/pwm-tiehrpwm.txt | 25 ++ Documentation/devicetree/bindings/pwm/tipwmss.txt | 30 ++ arch/arm/boot/dts/am335x-evm.dts | 21 + arch/arm/boot/dts/am33xx.dtsi | 90 +++++ arch/arm/mach-omap2/clock33xx_data.c | 37 ++ arch/arm/mach-omap2/control.h | 8 + arch/arm/mach-omap2/omap_hwmod_33xx_data.c | 414 +++++++++++++------- drivers/pwm/Kconfig | 11 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-tiecap.c | 36 ++- drivers/pwm/pwm-tiehrpwm.c | 53 +++- drivers/pwm/tipwmss.c | 136 +++++++ drivers/pwm/tipwmss.h | 8 + 14 files changed, 754 insertions(+), 138 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/tipwmss.txt create mode 100644 drivers/pwm/tipwmss.c create mode 100644 drivers/pwm/tipwmss.h -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
