Date: Thu, 19 Nov 2015 11:19:24 -0800
From: Brian Norris <computersforpeace@gmail.com>
To: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: David Woodhouse <dwmw2@infradead.org>, linux-mtd@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org,
        Hartley Sweeten <hsweeten@visionengravers.com>,
        Ryan Mallon <rmallon@gmail.com>, Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <kernel@pengutronix.de>, Imre Kaloz <kaloz@openwrt.org>,
        Krzysztof Halasa <khalasa@piap.pl>, Tony Lindgren <tony@atomide.com>,
        linux-omap@vger.kernel.org, Alexander Clouter <alex@digriz.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        Gregory CLEMENT <gregory.clement@free-electrons.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>, Daniel Mack <daniel@zonque.org>,
        Haojian Zhuang <haojian.zhuang@gmail.com>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
        Marek Vasut <marek.vasut@gmail.com>, Steven Miao <realmz6@gmail.com>,
        adi-buildroot-devel@lists.sourceforge.net,
        Mikael Starvik <starvik@axis.com>,
        Jesper Nilsson <jesper.nilsson@axis.com>, linux-cris-kernel@axis.com,
        Josh Wu <josh.wu@atmel.com>, Wan ZongShun <mcuos.com@gmail.com>,
        Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
        Maxim Levitsky <maximlevitsky@gmail.com>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <k.kozlowski@samsung.com>,
        linux-samsung-soc@vger.kernel.org,
        Maxime Ripard <maxime.ripard@free-electrons.com>,
        Chen-Yu Tsai <wens@csie.org>, linux-sunxi@googlegroups.com,
        Stefan Agner <stefan@agner.ch>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        devel@driverdev.osuosl.org
Subject: Re: [PATCH 02/27] mtd: nand: add an mtd_to_nand() helper
Message-ID: <20151119191924.GF64635@google.com>
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On Mon, Nov 16, 2015 at 02:37:35PM +0100, Boris Brezillon wrote:
> Some drivers are retrieving the nand_chip pointer using the container_of
> macro on a struct wrapping both the nand_chip and the mtd_info struct while
> the standard way of retrieving this pointer is through mtd->priv.
> Provide an helper to do that.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>  include/linux/mtd/nand.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 4f7c9b9..056d165 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -730,6 +730,11 @@ static inline struct device_node *nand_get_flash_node(struct nand_chip *chip)
>  	return chip->flash_node;
>  }
>  
> +static inline struct nand_chip *mtd_to_nand(struct mtd_info *mtd)
> +{
> +	return mtd->priv;
> +}
> +

Pushed this patch to l2-mtd.git, though I rebased it directly onto
4.4-rc1 and then merged it in. That way, if any other subsystems want to
start using this in the 4.5 -next cycle (e.g., for patches 4-8), they
can pull it in without taking the rest of MTD.

I can push this to a separate branch or signed tag, if anyone wants.

Or, I can take the arch/ patches via MTD, if that's a better option.

Brian
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