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

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Date:   Mon, 17 Jul 2023 09:46:14 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     Ben Dooks <ben.dooks@...ive.com>, linux-pwm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        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 Mon, Jul 17, 2023 at 08:07:10AM +0100, Ben Dooks wrote:
> On 15/07/2023 20:28, Uwe Kleine-König wrote:
> > 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 left the pci as the pwm-dwc so that anyone moving up and using
> this as a module won't have to change config or their module loading
> if they're not autoloading modules.

Yeah, I thought so. I don't care much either way, but maybe that's worth
mentioning in the commit log or even a comment in drivers/pwm/Makefile.

Best regards
Uwe

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

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