[U-Boot] [RFC PATCH 3/6] spi: spi-mem: Enable all SPI modes

[Vignesh R]

SPI controllers can support Dual/Quad modes, therefore remove this
constraint. Also, add claim and release bus when call spi_mem calls as
well.

Signed-off-by: Vignesh R <vigneshr at ti.com>
---
 drivers/spi/spi-mem.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index af9aef009a73..4c1463118ab2 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -231,7 +231,13 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 		mutex_lock(&ctlr->bus_lock_mutex);
 		mutex_lock(&ctlr->io_mutex);
 #endif
+		ret = spi_claim_bus(slave);
+		if (ret < 0)
+			return ret;
+
 		ret = ops->mem_ops->exec_op(slave, op);
+
+		spi_release_bus(slave);
 #ifndef __UBOOT__
 		mutex_unlock(&ctlr->io_mutex);
 		mutex_unlock(&ctlr->bus_lock_mutex);
@@ -323,15 +329,6 @@ int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 		return -EIO;
 #else
 
-	/* U-Boot does not support parallel SPI data lanes */
-	if ((op->cmd.buswidth != 1) ||
-	    (op->addr.nbytes && op->addr.buswidth != 1) ||
-	    (op->dummy.nbytes && op->dummy.buswidth != 1) ||
-	    (op->data.nbytes && op->data.buswidth != 1)) {
-		printf("Dual/Quad raw SPI transfers not supported\n");
-		return -ENOTSUPP;
-	}
-
 	if (op->data.nbytes) {
 		if (op->data.dir == SPI_MEM_DATA_IN)
 			rx_buf = op->data.buf.in;
-- 
2.19.2