From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mail-pa0-x242.google.com ([2607:f8b0:400e:c03::242])
 by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux))
 id 1bPPQL-0006dV-OF
 for linux-mtd@lists.infradead.org; Tue, 19 Jul 2016 07:26:38 +0000
Received: by mail-pa0-x242.google.com with SMTP id cf3so816106pad.2
 for <linux-mtd@lists.infradead.org>; Tue, 19 Jul 2016 00:26:17 -0700 (PDT)
Date: Tue, 19 Jul 2016 00:26:13 -0700
From: Brian Norris <computersforpeace@gmail.com>
To: =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>, linux-wireless@vger.kernel.org,
 David Woodhouse <dwmw2@infradead.org>,
 "open list:MEMORY TECHNOLOGY DEVICES (MTD)" <linux-mtd@lists.infradead.org>,
 open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mtd: add arch dependency for MTD_BCM47XXSFLASH symbol
Message-ID: <20160719072613.GA96986@google.com>
References: <1468912123-14899-1-git-send-email-zajec5@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1468912123-14899-1-git-send-email-zajec5@gmail.com>
List-Id: Linux MTD discussion mailing list <linux-mtd.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-mtd>,
 <mailto:linux-mtd-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-mtd/>
List-Post: <mailto:linux-mtd@lists.infradead.org>
List-Help: <mailto:linux-mtd-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
 <mailto:linux-mtd-request@lists.infradead.org?subject=subscribe>

On Tue, Jul 19, 2016 at 09:08:32AM +0200, Rafał Miłecki wrote:
> We dropped strict MIPS dependency for bcm47xxsflash driver in:
> commit 5651d6aaf489 ("mtd: bcm47xxsflash: use ioremap_cache() instead of
> KSEG0ADDR()") but using ioremap_cache still limits building it to few
> selected architectures only.
> 
> A recent commit 57d8f7dd2132 ("bcma: allow enabling serial flash support
> on non-MIPS SoCs") automatically dropped MIPS dependency for
> MTD_BCM47XXSFLASH which broke building e.g. on powerpc and cris.
> 
> The bcma change is alright as it doesn't break building bcma code in any
> way. MTD_BCM47XXSFLASH on the other hand should be limited to archs
> which need it and can build it (by providing ioremap_cache).
> 
> Fixes: 57d8f7dd2132 ("bcma: allow enabling serial flash support on non-MIPS SoCs")
> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
> Cc: Brian Norris <computersforpeace@gmail.com>

While I might prefer we have a better consistent set of portable I/O
accessors (it's really a mess), it seems quite reasonable to restrict
the damage to ARM and MIPS here if it saves some short-term hassle:

Acked-by: Brian Norris <computersforpeace@gmail.com>

> ---
> That bcma commit breaking building landed in the wireless-drivers-next.
> Is that possible to get this patch through the same tree?

That's fine with me.

Regards,
Brian

> ---
>  drivers/mtd/devices/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
> index f73c416..64a2485 100644
> --- a/drivers/mtd/devices/Kconfig
> +++ b/drivers/mtd/devices/Kconfig
> @@ -114,7 +114,7 @@ config MTD_SST25L
>  
>  config MTD_BCM47XXSFLASH
>  	tristate "R/O support for serial flash on BCMA bus"
> -	depends on BCMA_SFLASH
> +	depends on BCMA_SFLASH && (MIPS || ARM)
>  	help
>  	  BCMA bus can have various flash memories attached, they are
>  	  registered by bcma as platform devices. This enables driver for
> -- 
> 1.8.4.5
>