[PATCH v8 04/19] spi: spi-mtk-nor: reject DTR ops

[Pratyush Yadav]

Double Transfer Rate (DTR) ops are added in spi-mem. But this controller
doesn't support DTR transactions. Since we don't use the default
supports_op(), which rejects all DTR ops, do that explicitly in our
supports_op().

Signed-off-by: Pratyush Yadav <p.ya...@ti.com>
---
 drivers/spi/spi-mtk-nor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index d5f393871619..b08d8e9a8ee9 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -211,6 +211,12 @@ static bool mtk_nor_supports_op(struct spi_mem *mem,
        if (op->cmd.buswidth != 1)
                return false;
 
+       /* DTR ops not supported. */
+       if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
+               return false;
+       if (op->cmd.nbytes != 1)
+               return false;
+
        if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
                if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op))
                        return true;
-- 
2.26.2