linux-kernel - Re: [PATCH v6 06/10] pwm: dwc: split pci out of core driver

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Message-ID: <20221117161503.djk625nosikng2z4@pengutronix.de>
Date:   Thu, 17 Nov 2022 17:15:03 +0100
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, Lee Jones <lee.jones@...aro.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 v6 06/10] pwm: dwc: split pci out of core driver

Hello,

On Thu, Nov 10, 2022 at 04:35:56PM +0000, Ben Dooks wrote:
> On 10/11/2022 15:29, Uwe Kleine-König wrote:
> > On Thu, Oct 20, 2022 at 04:16:06PM +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>
> > > ---
> > > 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-pci.c | 133 ++++++++++++++++++++++++++++++++
> > >   drivers/pwm/pwm-dwc.c     | 158 +-------------------------------------
> > >   drivers/pwm/pwm-dwc.h     |  58 ++++++++++++++
> > >   5 files changed, 207 insertions(+), 157 deletions(-)
> > >   create mode 100644 drivers/pwm/pwm-dwc-pci.c
> > >   create mode 100644 drivers/pwm/pwm-dwc.h
> > > 
> > > diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> > > index 3f3c53af4a56..a9f1c554db2b 100644
> > > --- a/drivers/pwm/Kconfig
> > > +++ b/drivers/pwm/Kconfig
> > > @@ -175,15 +175,23 @@ config PWM_CROS_EC
> > >   	  Controller.
> > >   config PWM_DWC
> > > -	tristate "DesignWare PWM Controller"
> > > -	depends on PCI || COMPILE_TEST
> > > +	tristate "DesignWare PWM Controller core"
> > >   	depends on HAS_IOMEM
> > >   	help
> > > -	  PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
> > > +	  PWM driver for Synopsys DWC PWM Controller.
> > 
> > Currently pwm-dwc doesn't contain a driver but is only a library used by
> > pwm-dwc-pci (and later the of driver). As such it doesn't make sense to
> > be user-selectible, does it?
> 
> I suppose the PWM_DWC should select the original driver an a new
> PWM_DW_CORE should build the actual core driver.

Sounds about right.

I will discard the complete v6 series from the PWM patchwork in the
expectation that you will send a new round with all patches.

Best regards
Uwe

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

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