linux-kernel - Re: [PATCH] mtd: rawnand: ams-delta: Drop board specific partition info

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Date:   Sun, 24 Mar 2019 20:59:32 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        linux-mtd@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: ams-delta: Drop board specific partition
 info

Hi,

On Sun, Mar 24, 2019 at 05:48:22PM +0100, Janusz Krzysztofik wrote:
> Hi Aaro,
> 
> Thanks for your review.
> 
> On Wednesday, March 20, 2019 2:16:30 AM CET Aaro Koskinen wrote:
> > On Tue, Mar 19, 2019 at 11:37:18PM +0100, Janusz Krzysztofik wrote:
> > > After recent modifications, only a hardcoded partition info makes
> > > the driver device specific.  Other than that, the driver uses GPIO
> > > exclusively and can be used on any hardware.
> > > 
> > > Drop the partition info and use MTD partition parser with default
> > > list of partition types instead.
> > > 
> > > Amstrad Delta users should append the followig partition info to their
> >                                         ^^^^^^^^
> > Should be "following".
> > 
> > > kernel command line, possibly by embedding it in CONFIG_CMDLINE:
> > > mtdparts=ams-delta-nand:3584k(Kernel),256k(u-boot),256k(u-boot_params),\
> > > 256k(Amstrad_LDR),27m(File_system),768k(PBL_reserved).  For their
> > > convenience, select CONFIG_MTD_CMDLINE_PARTS  symbol from that board
> > > Kconfig automatically if this NAND driver is also selected.
> > > 
> > > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
> > > Cc: Tony Lindgren <tony@...mide.com>
> > 
> > Could we move the fixed partition setup to the board file
> > instead? Otherwise this kind of change is not really nice for the users,
> > as it will likely break existing setups. The default partition layout
> > should remain the same.
> 
> I'm wondering if it would be acceptable to pass partition info from a .dts 
> file.  I think that would be a better, more modern approach than adding a new 
> header under include/linux/platform_data.

Hmm, I thought there was some generic way to define partitions without
adding any new headers. But if that is not possible, then I guess your
CMDLINE proposal is the preferred one..

A.