spi: spi-fsl-dspi: Convert the instantiations that support it to DMA

The A-011218 eDMA/DSPI erratum affects most of the older Layerscape SoCs
with DSPI, and its workaround is a bit intrusive.

After this patch, there are no users of TCFQ mode that don't also
support XSPI (previously there was LS2085A).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Message-Id: <20200302001958.11105-7-olteanv@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-dspi.c

@@ -147,42 +147,49 @@ static const struct fsl_dspi_devtype_data devtype_data[] = {
 		.fifo_size		= 4,
 	},
 	[LS1021A] = {
+		/* Has A-011218 DMA erratum */
 		.trans_mode		= DSPI_TCFQ_MODE,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 4,
 	},
 	[LS1012A] = {
+		/* Has A-011218 DMA erratum */
 		.trans_mode		= DSPI_TCFQ_MODE,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 16,
 	},
 	[LS1043A] = {
+		/* Has A-011218 DMA erratum */
 		.trans_mode		= DSPI_TCFQ_MODE,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 16,
 	},
 	[LS1046A] = {
+		/* Has A-011218 DMA erratum */
 		.trans_mode		= DSPI_TCFQ_MODE,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 16,
 	},
 	[LS2080A] = {
-		.trans_mode		= DSPI_TCFQ_MODE,
+		.trans_mode		= DSPI_DMA_MODE,
+		.dma_bufsize		= 8,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 4,
 	},
 	[LS2085A] = {
-		.trans_mode		= DSPI_TCFQ_MODE,
+		.trans_mode		= DSPI_DMA_MODE,
+		.dma_bufsize		= 8,
 		.max_clock_factor	= 8,
 		.fifo_size		= 4,
 	},
 	[LX2160A] = {
-		.trans_mode		= DSPI_TCFQ_MODE,
+		.trans_mode		= DSPI_DMA_MODE,
+		.dma_bufsize		= 8,
 		.max_clock_factor	= 8,
 		.xspi_mode		= true,
 		.fifo_size		= 4,