PWM support for allwinner sun8i R40/T3/V40 SOCs. The sun8i R40/T3/V40 PWM has 8 PWM channals and divides to 4 PWM pairs, each PWM pair built-in 1 clock module, 2 timer logic module and 1 programmable dead-time generator, it also support waveform capture. It has 2 clock sources OSC24M and APB1, it is different with the sun4i-pwm driver, Therefore add a new driver for it. Some test method: cd /sys/class/pwm/pwmchip0 echo 0 > export cd pwm0 echo 1000 > period echo 500 > duty_cycle echo 1 > enable then check the PB2 pin with oscilloscope. v3 Changes: 1. fix coding format. 2. use 2/ilog2 instead of divide table 3. remove spinlock. 4. remove sun8i_pwm_data structure and use DT to parse pwm-channals 5. remove inline because complier knows it better. 6. don't hardcode clock source and parse two clock source from dt "mux-0" and "mux-1" 7. remove bypass method. 8. add a method to change clock source when mux-0 is not support the input period it can change to mux-1. 9. add cycle range check. 10. add some variable to make it more readability. 11. add clk_disable_unprepare when some false accur. v2 Changes: 1. change sun8i-r40 symbol to sun8i. 2. change pwm0_pin, pwm0-pin to pwm_ch0_pin, pwm-ch0-pin. 3. remove clk_disable_unprepare(), check !match and IS_ERR(pwm->regmap). Hao Zhang (6): Documentation: ARM: sunxi: pwm: add Allwinner sun8i. ARM: dtsi: add pwm node for sun8i R40. ARM: dts: add PWM for Bananapi M2 Ultrar board. DEV: CLK: add function to check the using clock name of driver. DEV: CLK: sunxi ccu: export clk_apb1 for sun8i-r40 soc pwm. ARM: PWM: add allwinner sun8i R40/T3/V40 PWM support. .../devicetree/bindings/pwm/pwm-sun8i.txt | 24 ++ arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts | 6 + arch/arm/boot/dts/sun8i-r40.dtsi | 17 + drivers/clk/clk.c | 6 + drivers/clk/sunxi-ng/ccu-sun8i-r40.h | 4 +- drivers/pwm/Kconfig | 12 +- drivers/pwm/Makefile | 1 + drivers/pwm/pwm-sun8i.c | 418 +++++++++++++++++++++ include/dt-bindings/clock/sun8i-r40-ccu.h | 2 + include/linux/clk-provider.h | 1 + 10 files changed, 489 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sun8i.txt create mode 100644 drivers/pwm/pwm-sun8i.c -- 2.7.4
