ARM: OMAP2+: Allow NAND transfer mode to be specified in DT

OMAP devices support various NAND transfer modes.

Currently all device-tree definitions will use the default "prefetch
polled" mode, so this patch enables the transfer mode to be specified
in the device-tree.

Signed-off-by: Mark Jackson <mpfj@newflow.co.uk>
Acked-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 6c4da1254f53..a195468286f4 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1345,6 +1345,13 @@ static const char * const nand_ecc_opts[] = {
         [OMAP_ECC_BCH8_CODE_HW]                 = "bch8",
 };
 
+static const char * const nand_xfer_types[] = {
+        [NAND_OMAP_PREFETCH_POLLED]             = "prefetch-polled",
+        [NAND_OMAP_POLLED]                      = "polled",
+        [NAND_OMAP_PREFETCH_DMA]                = "prefetch-dma",
+        [NAND_OMAP_PREFETCH_IRQ]                = "prefetch-irq",
+};
+
 static int gpmc_probe_nand_child(struct platform_device *pdev,
                                  struct device_node *child)
 {
@@ -1374,6 +1381,13 @@ static int gpmc_probe_nand_child(struct platform_device *pdev,
                                 break;
                         }
 
+        if (!of_property_read_string(child, "ti,nand-xfer-type", &s))
+                for (val = 0; val < ARRAY_SIZE(nand_xfer_types); val++)
+                        if (!strcasecmp(s, nand_xfer_types[val])) {
+                                gpmc_nand_data->xfer_type = val;
+                                break;
+                        }
+
         val = of_get_nand_bus_width(child);
         if (val == 16)
                 gpmc_nand_data->devsize = NAND_BUSWIDTH_16;