linux-kernel - Re: [PATCH v8 1/5] pwm: dwc: split pci out of core driver

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Message-ID: <20230715192832.hczmcchn4svzilnd@pengutronix.de>
Date:   Sat, 15 Jul 2023 21:28:32 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Ben Dooks <ben.dooks@...ive.com>
Cc:     linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ben.dooks@...ethink.co.uk,
        Thierry Reding <thierry.reding@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        jarkko.nikula@...ux.intel.com,
        William Salmon <william.salmon@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>
Subject: Re: [PATCH v8 1/5] pwm: dwc: split pci out of core driver

On Wed, Jun 14, 2023 at 06:14:53PM +0100, Ben Dooks wrote:
> Moving towards adding non-pci support for the driver, move the pci
> parts out of the core into their own module. This is partly due to
> the module_driver() code only being allowed once in a module and also
> to avoid a number of #ifdef if we build a single file in a system
> without pci support.
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
> ---
> v8:
>  - add module namespace
>  - remove compile-test for pci case, doesn't make sense
>  - fix makefile, missed config symbol changes
> v7:
>  - re-order kconfig to make dwc core be selected by PCI driver
> v6:
>  - put DWC_PERIOD_NS back to avoid bisect issues
> v4:
>  - removed DWC_PERIOD_NS as not needed
> ---
>  drivers/pwm/Kconfig        |  14 ++-
>  drivers/pwm/Makefile       |   1 +
>  drivers/pwm/pwm-dwc-core.c | 176 +++++++++++++++++++++++++++++++++
>  drivers/pwm/pwm-dwc.c      | 197 +------------------------------------
>  drivers/pwm/pwm-dwc.h      |  60 +++++++++++
>  5 files changed, 253 insertions(+), 195 deletions(-)
>  create mode 100644 drivers/pwm/pwm-dwc-core.c
>  create mode 100644 drivers/pwm/pwm-dwc.h
> 
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index 8df861b1f4a3..7c54cdcb97a0 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -186,9 +186,19 @@ config PWM_CROS_EC
>  	  PWM driver for exposing a PWM attached to the ChromeOS Embedded
>  	  Controller.
>  
> +config PWM_DWC_CORE
> +	tristate
> +	depends on HAS_IOMEM
> +	help
> +	  PWM driver for Synopsys DWC PWM Controller.
> +
> +	  To compile this driver as a module, build the dependecies as
> +	  modules, this will be called pwm-dwc-core.
> +
>  config PWM_DWC
> -	tristate "DesignWare PWM Controller"
> -	depends on PCI
> +	tristate "DesignWare PWM Controller (PCI bus)"
> +	depends on HAS_IOMEM && PCI
> +	select PWM_DWC_CORE
>  	help
>  	  PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
>  
> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
> index 19899b912e00..de3ed77e8d7c 100644
> --- a/drivers/pwm/Makefile
> +++ b/drivers/pwm/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLK)		+= pwm-clk.o
>  obj-$(CONFIG_PWM_CLPS711X)	+= pwm-clps711x.o
>  obj-$(CONFIG_PWM_CRC)		+= pwm-crc.o
>  obj-$(CONFIG_PWM_CROS_EC)	+= pwm-cros-ec.o
> +obj-$(CONFIG_PWM_DWC_CORE)	+= pwm-dwc-core.o
>  obj-$(CONFIG_PWM_DWC)		+= pwm-dwc.o

Would it make sense to call this pwm-dwc-pci.o? And the symbol
CONFIG_PWM_DWC_PCI? (The latter would break make oldconfig. Hmm, I'm
unsure myself.)

I didn't check all the details, but assuming that this is a split
without further changes it looks ok to me.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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