Acked-by: Pekon Gupta <[email protected]>
> 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.
> ---
> .../devicetree/bindings/mtd/gpmc-nand.txt | 8 ++++++++
> arch/arm/mach-omap2/gpmc.c | 14 ++++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> index e7f8d7e..cd4a19b 100644
> --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> @@ -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 = <0>;
> gpmc,cs-on = <0>;
> diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-
> omap2/gpmc.c
> index 410e1ba..2f47f76 100644
> --- a/arch/arm/mach-omap2/gpmc.c
> +++ b/arch/arm/mach-omap2/gpmc.c
> @@ -1212,6 +1212,13 @@ 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)
> {
> @@ -1241,6 +1248,13 @@ 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;
> --
> 1.7.9.5
> --
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