linux-kernel - Re: [PATCH 3/4] mtd: mchp23k256: add partitioning support

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Date:   Wed, 17 May 2017 17:29:11 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     dwmw2@...radead.org, computersforpeace@...il.com, andrew@...n.ch,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Subject: Re: [PATCH 3/4] mtd: mchp23k256: add partitioning support

Hi Chris,

On Wed, 17 May 2017 17:39:07 +1200
Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:

> Setting the of_node for the mtd device allows the generic mtd code to
> setup the partitions. Additionally we must specify a non-zero erasesize
> for the partitions to be writeable.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  drivers/mtd/devices/mchp23k256.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
> index 2542f5b8b63f..02c6b9dcbd3e 100644
> --- a/drivers/mtd/devices/mchp23k256.c
> +++ b/drivers/mtd/devices/mchp23k256.c
> @@ -143,6 +143,7 @@ static int mchp23k256_probe(struct spi_device *spi)
>  
>  	data = dev_get_platdata(&spi->dev);
>  
> +	mtd_set_of_node(&flash->mtd, spi->dev.of_node);
>  	flash->mtd.dev.parent	= &spi->dev;
>  	flash->mtd.type		= MTD_RAM;
>  	flash->mtd.flags	= MTD_CAP_RAM;
> @@ -151,6 +152,10 @@ static int mchp23k256_probe(struct spi_device *spi)
>  	flash->mtd._read	= mchp23k256_read;
>  	flash->mtd._write	= mchp23k256_write;
>  
> +	flash->mtd.erasesize = PAGE_SIZE;
> +	while (flash->mtd.size & (flash->mtd.erasesize - 1))
> +		flash->mtd.erasesize >>= 1;
> +

Can we fix allocate_partition() to properly handle the
master->erasesize == 0 case instead of doing that?

Thanks,

Boris