linux-kernel - Re: [PATCH v7 0/2] riscv: pwm: sophgo: add pwm support for CV1800

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Date: Sat, 4 May 2024 14:49:54 +0800
From: Jingbao Qiu <qiujingbao.dlmu@...il.com>
To: Chen Wang <unicorn_wang@...look.com>
Cc: ukleinek@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, dlan@...too.org, linux-pwm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 0/2] riscv: pwm: sophgo: add pwm support for CV1800

On Fri, May 3, 2024 at 9:47 AM Chen Wang <unicorn_wang@...look.com> wrote:
>
> Hi, Jingbao,
>
> This patchset should also be sent to the linux-riscv mailinglist.

I will do that.

>
> On 2024/5/1 16:32, Jingbao Qiu wrote:
> > The Sophgo CV1800 chip provides a set of four independent
> > PWM channel outputs.
> > This series adds PWM controller support for Sophgo cv1800.
> >
> > Changes since v6:
> > - add detailed Limitations
> > - using BIT(n) instead BIT(0) << n
> > - use 0 instead of disable macro
> > - modify OE judgment criteria
> > - add devm_regmap_init_mmio error message
> > - delete unused variable
> >
> > v6: https://lore.kernel.org/all/20240406063413.3334639-1-qiujingbao.dlmu@gmail.com/
> >
> > Changes since v5:
> > - delete the OE function because we plan to use the counter subsystem
> >    instead of capture, so there is no need to reuse this code.
> > - fix set polarity reverse error.
> >
> > v5: https://lore.kernel.org/all/20240314100131.323540-1-qiujingbao.dlmu@gmail.com/
> >
> > Changes since v4:
> > - drop filename
> > - fix macro
> > - optimize cv1800_pwm_set_polarity()
> > - optimize cv1800_pwm_set_oe()
> > - add comment for cv1800_pwm_set_oe()
> > - use ticks replace tem
> > - fix duty_cycle larger than period_val
> > - use devm_clk_rate_exclusive_get() replace
> >    clk_rate_exclusive_get()
> > - map linux polarity to register polarity
> >
> > v4: https://lore.kernel.org/all/20240304085933.1246964-1-qiujingbao.dlmu@gmail.com/
> >
> > datasheet Link: https://github.com/milkv-duo/duo-files/blob/main/duo/datasheet/CV1800B-CV1801B-Preliminary-Datasheet-full-en.pdf
> > page 614
> >
> > Changes since v3:
> > - use macro instead of npwm number
> > - add support for polarity feature
> > - add support for Output-Enable/OE feature
> >
> > v3: https://lore.kernel.org/all/20240223082014.109385-1-qiujingbao.dlmu@gmail.com/
> >
> > Changes since v2:
> > - use 0x08 instead of macro
> > - split if statements based on conditions
> > - in order to round up, first calculate the
> >    number of high-level cycles, then subtract
> >    it from the PERIOD to obtain the number of HLPERIOD
> > - use new pwmchip_alloc() API instead of old style
> >
> > v2: https://lore.kernel.org/all/20240212121729.1086718-1-qiujingbao.dlmu@gmail.com/
> >
> > Changes since v1:
> > - drop full stop from subject
> > - re-order maintainers and description
> > - pass checkpatch.pl --strict
> > - fix naming errors
> > - add "Limitations" section
> > - use a driver specific prefix for all defines
> > - using bool instead u32 in cv1800_pwm_enable
> > - check and set state->polarity
> > - use mul_u64_u64_div_u64
> > - use clk_rate_exclusive_get(), balance with clk_rate_exclusive_put()
> > - using macro definitions instead of shift operations
> > - remove shift operation on 0
> > - use priv replace cv_pwm
> > - hardcode npwm
> > - set atomic to true
> > - remove MODULE_ALIAS
> >
> > v1: https://lore.kernel.org/all/20240207055856.672184-1-qiujingbao.dlmu@gmail.com/
> >
> > Jingbao Qiu (2):
> >    dt-bindings: pwm: sophgo: add pwm for Sophgo CV1800 series SoC
> >    pwm: sophgo: add pwm support for Sophgo CV1800 SoC
> >
> >   .../bindings/pwm/sophgo,cv1800-pwm.yaml       |  45 +++
> >   drivers/pwm/Kconfig                           |  10 +
> >   drivers/pwm/Makefile                          |   1 +
> >   drivers/pwm/pwm-cv1800.c                      | 293 ++++++++++++++++++
> >   4 files changed, 349 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/pwm/sophgo,cv1800-pwm.yaml
> >   create mode 100644 drivers/pwm/pwm-cv1800.c
> >
> >
> > base-commit: 32c44e1fa921aebf8a5ef9f778534a30aab39313

Best regards
Jingbao Qiu