linux-kernel - Re: [PATCH v9 2/4] pwm: opencores: Add PWM driver support

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Message-ID: <62bb91ad-5d4b-4ec6-80c8-6c3edf5d25cd@starfivetech.com>
Date:   Wed, 13 Dec 2023 17:27:26 +0800
From:   William Qiu <william.qiu@...rfivetech.com>
To:     Rob Herring <robh+dt@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-pwm@...r.kernel.org>,
        "Emil Renner Berthing" <kernel@...il.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Hal Feng <hal.feng@...rfivetech.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v9 2/4] pwm: opencores: Add PWM driver support



On 2023/12/12 1:41, Rob Herring wrote:
> On Fri, Dec 8, 2023 at 3:42 AM William Qiu <william.qiu@...rfivetech.com> wrote:
>>
>> Add driver for OpenCores PWM Controller. And add compatibility code
>> which based on StarFive SoC.
>>
>> Co-developed-by: Hal Feng <hal.feng@...rfivetech.com>
>> Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
>> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
>> ---
>>  MAINTAINERS              |   7 ++
>>  drivers/pwm/Kconfig      |  12 ++
>>  drivers/pwm/Makefile     |   1 +
>>  drivers/pwm/pwm-ocores.c | 229 +++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 249 insertions(+)
>>  create mode 100644 drivers/pwm/pwm-ocores.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 788be9ab5b73..7a11a22da09e 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -16204,6 +16204,13 @@ F:     Documentation/i2c/busses/i2c-ocores.rst
>>  F:     drivers/i2c/busses/i2c-ocores.c
>>  F:     include/linux/platform_data/i2c-ocores.h
>>
>> +OPENCORES PWM DRIVER
>> +M:     William Qiu <william.qiu@...rfivetech.com>
>> +M:     Hal Feng <hal.feng@...rfivetech.com>
>> +S:     Supported
>> +F:     Documentation/devicetree/bindings/pwm/opencores,pwm.yaml
>> +F:     drivers/pwm/pwm-ocores.c
>> +
>>  OPENRISC ARCHITECTURE
>>  M:     Jonas Bonn <jonas@...thpole.se>
>>  M:     Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
>> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
>> index 4b956d661755..d87e1bb350ba 100644
>> --- a/drivers/pwm/Kconfig
>> +++ b/drivers/pwm/Kconfig
>> @@ -444,6 +444,18 @@ config PWM_NTXEC
>>           controller found in certain e-book readers designed by the original
>>           design manufacturer Netronix.
>>
>> +config PWM_OCORES
>> +       tristate "OpenCores PWM support"
>> +       depends on HAS_IOMEM && OF
>> +       depends on COMMON_CLK && RESET_CONTROLLER
>> +       depends on ARCH_STARFIVE || COMPILE_TEST
>> +       help
>> +         If you say yes to this option, support will be included for the
>> +         OpenCores PWM. For details see https://opencores.org/projects/ptc.
>> +
>> +         To compile this driver as a module, choose M here: the module
>> +         will be called pwm-ocores.
>> +
>>  config PWM_OMAP_DMTIMER
>>         tristate "OMAP Dual-Mode Timer PWM support"
>>         depends on OF
>> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
>> index c5ec9e168ee7..517c4f643058 100644
>> --- a/drivers/pwm/Makefile
>> +++ b/drivers/pwm/Makefile
>> @@ -40,6 +40,7 @@ obj-$(CONFIG_PWM_MICROCHIP_CORE)      += pwm-microchip-core.o
>>  obj-$(CONFIG_PWM_MTK_DISP)     += pwm-mtk-disp.o
>>  obj-$(CONFIG_PWM_MXS)          += pwm-mxs.o
>>  obj-$(CONFIG_PWM_NTXEC)                += pwm-ntxec.o
>> +obj-$(CONFIG_PWM_OCORES)       += pwm-ocores.o
>>  obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o
>>  obj-$(CONFIG_PWM_PCA9685)      += pwm-pca9685.o
>>  obj-$(CONFIG_PWM_PXA)          += pwm-pxa.o
>> diff --git a/drivers/pwm/pwm-ocores.c b/drivers/pwm/pwm-ocores.c
>> new file mode 100644
>> index 000000000000..996ca3805901
>> --- /dev/null
>> +++ b/drivers/pwm/pwm-ocores.c
>> @@ -0,0 +1,229 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * OpenCores PWM Driver
>> + *
>> + * https://opencores.org/projects/ptc
>> + *
>> + * Copyright (C) 2018-2023 StarFive Technology Co., Ltd.
>> + *
>> + * Limitations:
>> + * - The hardware only do inverted polarity.
>> + * - The hardware minimum period / duty_cycle is (1 / pwm_apb clock frequency) ns.
>> + * - The hardware maximum period / duty_cycle is (U32_MAX / pwm_apb clock frequency) ns.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
> 
> You probably don't need this header and the implicit includes it makes
> are dropped now in linux-next. Please check what you actually need and
> make them explicit.
> 
> Rob
Will drop.

Thank you for spending time on this patchset.

Best Regards
William