Re: [v5,04/17] mtd: rawnand: omap2: convert driver to nand_scan()

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Thu, 13 Dec 2018 19:01:11 +0100
Alexander Sverdlin <alexander.sverdlin@gmail.com> wrote:

> > +static int omap_nand_attach_chip(struct nand_chip *chip)
> > +{
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +	struct omap_nand_info *info = mtd_to_omap(mtd);
> > +	struct device *dev = &info->pdev->dev;
> > +	int min_oobbytes = BADBLOCK_MARKER_LENGTH;
> > +	int oobbytes_per_step;
> > +	dma_cap_mask_t mask;
> > +	int err;
> > +
> > +	if (chip->bbt_options & NAND_BBT_USE_FLASH)
> > +		chip->bbt_options |= NAND_BBT_NO_OOB;
> > +	else
> > +		chip->options |= NAND_SKIP_BBTSCAN;
> > +
> > +	/* Re-populate low-level callbacks based on xfer modes */
> > +	switch (info->xfer_type) {
> > +	case NAND_OMAP_PREFETCH_POLLED:
> > +		chip->read_buf = omap_read_buf_pref;
> > +		chip->write_buf = omap_write_buf_pref;
> > +		break;
> > +
> > +	case NAND_OMAP_POLLED:
> > +		/* Use nand_base defaults for {read,write}_buf */
> > +		break;
> > +
> > +	case NAND_OMAP_PREFETCH_DMA:
> > +		dma_cap_zero(mask);
> > +		dma_cap_set(DMA_SLAVE, mask);
> > +		info->dma = dma_request_chan(dev, "rxtx");
> > +

Can you try with

		info->dma = dma_request_chan(dev->parent, "rxtx");

?