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 #6 & 7. 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 - HWMOD data correction in EPWMSS at patch #2 - Parent child in HWMOD relation handled at patch #3 - Optional EHRPWM tb clock in patch #6 - Support for TBCLK clock gating at patch #7. - Device tree binding support handled in patch #4,8 - Pinctrl support in patch #5 & 9. - DT node populated in patch #10 ,11 & 12. This patch series based on omap_dt/for_3.8/dts_part2 and tested on am335x-evm & am335x-evmsk. This patch series will come under 3 subsystem basically. But sent it in single patch series to have a clearer picture of why the OMAP subsystem changes required. Patches come under PWM (1,4,5,7,8,9) Patches come under OMAP (2,3,6) Patches come under DT (10,11,12). It depends on [1] 1. https://gitorious.org/linux-pwm/linux-pwm/commit/83af24027b3df1af5c5a9aa9adcdcfeb3429d3be 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 (12): PWMSS: Add PWM Subsystem driver for parent<->child relationship ARM: OMAP: AM33xx hwmod: Corrects PWM subsystem HWMOD entries ARM: OMAP: AM33xx hwmod: Add parent-child relationship for PWM subsystem pwm: tiecap: Add device-tree binding pwm: pwm-tiecap: pinctrl support ARM: AM33XX: clk: Add clock node for EHRPWM TBCLK pwm: pwm-tiehrpwm: Adding TBCLK gating support. pwm: tiehrpwm: Add device-tree binding pwm: pwm-tiehrpwm: pinctrl 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 | 388 +++++++++++++------- drivers/pwm/Kconfig | 11 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-tiecap.c | 48 +++- drivers/pwm/pwm-tiehrpwm.c | 62 +++- drivers/pwm/pwm-tipwmss.c | 139 +++++++ drivers/pwm/pwm-tipwmss.h | 39 ++ 15 files changed, 797 insertions(+), 144 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 -- 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
