On Tue, Nov 27, 2012 at 02:18:05PM +0530, Philip, Avinash wrote: > 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 Patches 1, 4, 5, 7, 8 and 9 applied, with a minor fixup to the subject line of patch 1. Thanks. Thierry
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