Hao, Would you mind me to continue on this work? Newer Allwinner SoCs have PWM controllers similar to the R40 one. Yours sincerely, Icenowy Zheng 在 2018-11-26星期一的 00:18 +0800，Hao Zhang写道： > 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 >
