linux-kernel - Re: [PATCH v0] pata_parport: add driver (PARIDE replacement)

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Date:   Fri, 11 Mar 2022 19:55:15 +0100
From:   Ondrej Zary <linux@...y.sk>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Tim Waugh <tim@...erelk.net>, linux-block@...r.kernel.org,
        linux-parport@...ts.infradead.org, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v0] pata_parport: add driver (PARIDE replacement)

On Friday 11 March 2022 00:59:20 Damien Le Moal wrote:
> On 3/11/22 06:28, Ondrej Zary wrote:
> > Add pata_parport (PARIDE replacement) core libata driver.
> > 
> > The original paride protocol modules are used for now so allow them to
> > be compiled without old PARIDE core.
> > 
> > Signed-off-by: Ondrej Zary <linux@...y.sk>
> > ---
> >  drivers/Makefile                   |   2 +-
> >  drivers/ata/Kconfig                |  22 +
> >  drivers/ata/Makefile               |   2 +
> >  drivers/ata/parport/Makefile       |   3 +
> >  drivers/ata/parport/pata_parport.c | 805 +++++++++++++++++++++++++++++
> >  drivers/ata/parport/pata_parport.h | 108 ++++
> >  drivers/block/paride/Kconfig       |  32 +-
> >  drivers/block/paride/paride.h      |   5 +
> >  8 files changed, 962 insertions(+), 17 deletions(-)
> >  create mode 100644 drivers/ata/parport/Makefile
> >  create mode 100644 drivers/ata/parport/pata_parport.c
> >  create mode 100644 drivers/ata/parport/pata_parport.h
> > 
> > diff --git a/drivers/Makefile b/drivers/Makefile
> > index a110338c860c..8ec515f3614e 100644
> > --- a/drivers/Makefile
> > +++ b/drivers/Makefile
> > @@ -98,7 +98,7 @@ obj-$(CONFIG_DIO)		+= dio/
> >  obj-$(CONFIG_SBUS)		+= sbus/
> >  obj-$(CONFIG_ZORRO)		+= zorro/
> >  obj-$(CONFIG_ATA_OVER_ETH)	+= block/aoe/
> > -obj-$(CONFIG_PARIDE) 		+= block/paride/
> > +obj-y		 		+= block/paride/
> >  obj-$(CONFIG_TC)		+= tc/
> >  obj-$(CONFIG_USB_PHY)		+= usb/
> >  obj-$(CONFIG_USB)		+= usb/
> > diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> > index e5641e6c52ee..671c27b77a48 100644
> > --- a/drivers/ata/Kconfig
> > +++ b/drivers/ata/Kconfig
> > @@ -1161,6 +1161,28 @@ config PATA_WINBOND_VLB
> >  	  Support for the Winbond W83759A controller on Vesa Local Bus
> >  	  systems.
> >  
> > +config PATA_PARPORT
> > +	tristate "Parallel port IDE device support"
> > +	depends on PARPORT_PC && PARIDE=n
> 
> This is very confusing. The change above this one switch paride
> compilation to be unconditional, regardless of CONFIG_PARIDE value, but
> here, you have the dependency to PARIDE=n. I do not understand... Please
> clarify.

pata_parport will use existing paride protocol modules. So the paride/ directory must be processed to compile the protocol modules (if they're enabled) even if paride is not enabled.

pata_parport and paride are mutually exclusive because the binary protocol modules are incompatible (the struct pi_adapter is different).

-- 
Ondrej Zary