[PATCH 2/2] mtd: make spinand driver usable without CONFIG_DM

[Mikhail Kshevetskiy]

On Sat, 11 Jul 2020 14:16:23 +0530
Jagan Teki <jagan at amarulasolutions.com> wrote:

> On Mon, Jun 22, 2020 at 9:25 PM Mikhail Kshevetskiy
> <mikhail.kshevetskiy at oktetlabs.ru> wrote:
> >
> > From: Mikhail Kshevetskiy <Mikhail.Kshevetskiy at oktetlabs.ru>
> >
> > Here is an example of spinand driver initialization without CONFIG_DM
> > enabled:
> >
> > void board_nand_init(void)
> > {
> >         static struct spinand_device    spinand;
> >         static struct mtd_info          mtd;
> >         static struct spi_slave         *slave;
> >         int                             ret;
> >
> >         memset(&spinand, 0, sizeof(spinand));
> >         memset(&mtd, 0, sizeof(mtd));
> >
> >         slave = spi_setup_slave(BUS, CS, MAX_HZ, MODE);
> >         if (!slave) {
> >                 printf("SPI-NAND: Failed to set up SPI slave\n");
> >                 return;
> >         }
> >
> >         slave->mode |= (SPI_TX_BYTE | SPI_RX_SLOW);
> >         slave->max_read_size = SPI_MAX_READ_SIZE;
> >         slave->max_write_size = SPI_MAX_WRITE_SIZE;
> >
> >         ret = spinand_probe_no_dm(&spinand, slave, &mtd);
> >         if (!ret)
> >                 nand_register(0, &mtd);
> > }
> >
> > Using of dual and quad wire transfer modes requires:
> > * dual/quad speed capable hardware (both controller and flash)
> > * physical presence of 4 data wires (quad mode only)
> > * spi controller driver MUST supports slave->mem_ops.exec_op() operations
> >   (spi_xfer() interface will suits for single speed data transfer mode
> >   only)
> >
> > Signed-off-by: Mikhail Kshevetskiy <Mikhail.Kshevetskiy at oktetlabs.ru>
> > ---
> 
> Now it's time for dm only code, better not come up with nondm anymore
> as possible, please.
> 
> Jagan.

I know about it. These patches were in the queue for upstreaming from the new
year :-(

We are using 2010 and 2016 year based u-boot in our projects and due to some
reasons it's not easy to switch it to DM build. This two patches helps us with
backporting of spinand driver from upsteam u-boot. I think we are not an only
users of old u-boot in the world, so it maybe helpful for other people as well.

Just ignore these two patches if you think that NODM era is completely over.


Mikhail.