On Sun, Jan 26, 2014 at 02:16:43PM +0800, Hou Zhiqiang wrote:
> To give spi flash layout using "mtdparts=..." in cmdline, we must
> give mtd_info a fixed name,because the cmdlinepart's parser will
> match the name given in cmdline with the mtd_info.
>
> Now, if use OF node, mtd_info's name will be spi->dev->name. It
> consists of spi_master->bus_num, and the spi_master->bus_num maybe
> dynamically fetched.
> So, give the mtd_info a new fiexd name "name.cs", "name" is name of
> spi_device_id and "cs" is chip-select in spi_dev.
>
> Signed-off-by: Hou Zhiqiang <b48...@freescale.com>
> ---
> v2:
> - add check for return value of function kasprintf.
> - whether the spi_master->bus_num is dynamical is determined by spi
> controller driver, and it can't be check in this driver. So, we can
> not initial the mtd_info's name by distinguishing the spi_master
> bus_num dynamically-allocated or not.
How about spi->master->bus_num < 0 ?
> drivers/mtd/devices/m25p80.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index eb558e8..1f494d2 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -1011,8 +1011,12 @@ static int m25p_probe(struct spi_device *spi)
>
> if (data && data->name)
> flash->mtd.name = data->name;
> - else
> - flash->mtd.name = dev_name(&spi->dev);
> + else {
> + flash->mtd.name = kasprintf(GFP_KERNEL, "%s.%d",
> + id->name, spi->chip_select);
I don't think this name is specific enough. What if there are more than
one SPI controller? Then there could be one chip with the same
chip-select. You probably still need to incorporate the SPI master
somehow, even if it's not by using the bus number directly (because it's
dynamic).
> + if (!flash->mtd.name)
> + return -ENOMEM;
> + }
>
> flash->mtd.type = MTD_NORFLASH;
> flash->mtd.writesize = 1;
Brian
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