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

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Date:   Thu, 10 Nov 2022 16:35:56 +0000
From:   Ben Dooks <ben.dooks@...ive.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
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

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.

-- 
Ben