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Message-ID: <0a9bda1e91246c7e473fcbb833ac94159d13b084.camel@aosc.io>
Date: Thu, 22 Jul 2021 09:03:18 +0800
From: Icenowy Zheng <icenowy@...c.io>
To: Hao Zhang <hao5781286@...il.com>, robh+dt@...nel.org,
mark.rutland@....com, maxime.ripard@...tlin.com, wens@...e.org,
mturquette@...libre.com, sboyd@...nel.org, thierry.reding@...il.com
Cc: linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-sunxi@...glegroups.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/6] PWM support for allwinner sun8i R40/T3/V40 SOCs.
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
>
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