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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>
This commit is contained in:
Mark Jackson 2013-04-19 21:08:28 +01:00 committed by Tony Lindgren
parent 4d5843616d
commit 496c8a0bbb
2 changed files with 22 additions and 0 deletions
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8
Documentation/devicetree/bindings/mtd/gpmc-nand.txt
View File

@ -29,6 +29,13 @@ Optional properties:
"bch4" 4-bit BCH ecc code
"bch8" 8-bit BCH ecc code
- ti,nand-xfer-type: A string setting the data transfer type. One of:
"prefetch-polled" Prefetch polled mode (default)
"polled" Polled mode, without prefetch
"prefetch-dma" Prefetch enabled sDMA mode
"prefetch-irq" Prefetch enabled irq mode
- elm_id: Specifies elm device node. This is required to support BCH
error correction using ELM module.
@ -55,6 +62,7 @@ Example for an AM33xx board:
reg = <0 0 0>; /* CS0, offset 0 */
nand-bus-width = <16>;
ti,nand-ecc-opt = "bch8";
ti,nand-xfer-type = "polled";
gpmc,sync-clk-ps = <0>;
gpmc,cs-on-ns = <0>;

14
arch/arm/mach-omap2/gpmc.c
View File

@ -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;