linux-kernel - Re: [PATCH 1/2] ata: clean up how architectures enable PATA_PLATFORM and PATA_OF

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Date:   Fri, 16 Sep 2022 15:26:18 +0100
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ata: clean up how architectures enable PATA_PLATFORM
 and PATA_OF_PLATFORM

On 2022/09/14 15:27, Lukas Bulwahn wrote:
> There are two options for platform device PATA support:
> 
>   PATA_PLATFORM: Generic platform device PATA support
>   PATA_OF_PLATFORM: OpenFirmware platform device PATA support
> 
> If an architecture allows the generic platform device PATA support, it
> shall select HAVE_PATA_PLATFORM. Then, Generic platform device PATA support
> is available and can be selected.
> 
> If an architecture has OpenFirmware support, which it indicates by
> selecting OF, OpenFirmware platform device PATA support is available
> and can be selected.
> If OpenFirmware platform device PATA support is selected, then the
> functionality (code files) from Generic platform device PATA support needs
> to be integrated in the kernel build for the OpenFirmware platform device
> PATA support to work. Select PATA_PLATFORM in PATA_OF_PLATFORM to make sure
> the needed files are added in the build.
> 
> So, architectures with OpenFirmware support, do not need to additionally
> select HAVE_PATA_PLATFORM. It is only needed by architecture that want the
> non-OF pata-platform module.
> 
> Reflect this way of intended use of config symbols in the ata Kconfig and
> adjust all architecture definitions.
> 
> This follows the suggestion from Arnd Bergmann (see Link).
> 
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Link: https://lore.kernel.org/all/4b33bffc-2b6d-46b4-9f1d-d18e55975a5a@www.fastmail.com/
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>

Applied this patch and 2/2 to for-6.1. Thanks !

> ---
>  arch/arm/mach-versatile/Kconfig | 1 -
>  arch/arm64/Kconfig              | 1 -
>  drivers/ata/Kconfig             | 6 +++---
>  3 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/mach-versatile/Kconfig b/arch/arm/mach-versatile/Kconfig
> index 2ef226194c3a..b1519b4dc03a 100644
> --- a/arch/arm/mach-versatile/Kconfig
> +++ b/arch/arm/mach-versatile/Kconfig
> @@ -256,7 +256,6 @@ menuconfig ARCH_VEXPRESS
>  	select GPIOLIB
>  	select HAVE_ARM_SCU if SMP
>  	select HAVE_ARM_TWD if SMP
> -	select HAVE_PATA_PLATFORM
>  	select CLK_ICST
>  	select NO_IOPORT_MAP
>  	select PLAT_VERSATILE
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 51f3f07c3efd..036bd67e662e 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -194,7 +194,6 @@ config ARM64
>  	select HAVE_IRQ_TIME_ACCOUNTING
>  	select HAVE_KVM
>  	select HAVE_NMI
> -	select HAVE_PATA_PLATFORM
>  	select HAVE_PERF_EVENTS
>  	select HAVE_PERF_REGS
>  	select HAVE_PERF_USER_STACK_DUMP
> 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

-- 
Damien Le Moal
Western Digital Research