linux-kernel - Re: [PATCH v2] powerpc: select HAVE_PATA_PLATFORM in PPC instead of creating a PPC dependency

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Date:   Fri, 09 Sep 2022 13:31:02 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Christophe Leroy" <christophe.leroy@...roup.eu>,
        "Lukas Bulwahn" <lukas.bulwahn@...il.com>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "Nicholas Piggin" <npiggin@...il.com>,
        "Damien Le Moal" <damien.lemoal@...nsource.wdc.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Cc:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] powerpc: select HAVE_PATA_PLATFORM in PPC instead of creating a
 PPC dependency

On Fri, Sep 9, 2022, at 1:19 PM, Christophe Leroy wrote:
> Le 09/09/2022 à 13:09, Arnd Bergmann a écrit :
>> On Fri, Sep 9, 2022, at 11:03 AM, Lukas Bulwahn wrote:
>> 
>> I don't see a single powerpc machine that creates a
>>   name="pata_platform" platform_device. I suspect this was
>> only needed bwfore 2007 commit 9cd55be4d223 ("[POWERPC] pasemi:
>> Move electra-ide to pata_of_platform"), so the "|| PPC"
>> bit should just get removed without adding the HAVE_PATA_PLATFORM
>> bit.
>
> But that was added in 2008 by commit 61f7162117d4 ("libata: 
> pata_of_platform: OF-Platform PATA device driver")

Ah, I see. In that case, I think we should probably just always
allow PATA_OF_PLATFORM to be enabled regardless of
HAVE_PATA_PLATFORM, something like

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 1c9f4fb2595d..c93d97455744 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -1102,8 +1102,7 @@ config PATA_PCMCIA
 	  If unsure, say N.
 
 config PATA_PLATFORM
-	tristate "Generic platform device PATA support"
-	depends on EXPERT || PPC || HAVE_PATA_PLATFORM
+	tristate "Generic platform device PATA support" if EXPERT || HAVE_PATA_PLATFORM
 	help
 	  This option enables support for generic directly connected ATA
 	  devices commonly found on embedded systems.
@@ -1112,7 +1111,8 @@ config PATA_PLATFORM
 
 config PATA_OF_PLATFORM
 	tristate "OpenFirmware platform device PATA support"
-	depends on PATA_PLATFORM && OF
+	depends on OF
+	select PATA_PLATFORM
 	help
 	  This option enables support for generic directly connected ATA
 	  devices commonly found on embedded systems with OpenFirmware

and then also drop the "select HAVE_PATA_PLATFORM" from
arm64 and arm/versatile.

Or we can go one step further, and either split out the
'pata_platform_driver' into a separate file from
'__pata_platform_probe', or merge pata_of_platform.c
back into pata_platform.c.

      Arnd