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

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Date:   Sun, 24 Mar 2019 21:30:28 +0100
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Aaro Koskinen <aaro.koskinen@....fi>
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 Sunday, March 24, 2019 7:59:32 PM CET Aaro Koskinen wrote:
> 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..

I could for example reuse (or abuse) struct gpio_nand_platdata defined in 
include/linux/mtd/nand-gpio.h for use with drivers/mtd/nand/raw/gpio.c, but 
I'm not sure if hi-jacking a header that belongs to another driver would be an 
elegant solution.

Thanks,
Janusz


> 
> A.
>