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Documentation / devicetree / bindings / mtd / gpmi-nand.txt




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Based on kernel version 3.19. Page generated on 2015-02-13 21:18 EST.

1	* Freescale General-Purpose Media Interface (GPMI)
2	
3	The GPMI nand controller provides an interface to control the
4	NAND flash chips. We support only one NAND chip now.
5	
6	Required properties:
7	  - compatible : should be "fsl,<chip>-gpmi-nand"
8	  - reg : should contain registers location and length for gpmi and bch.
9	  - reg-names: Should contain the reg names "gpmi-nand" and "bch"
10	  - interrupts : BCH interrupt number.
11	  - interrupt-names : Should be "bch".
12	  - dmas: DMA specifier, consisting of a phandle to DMA controller node
13	    and GPMI DMA channel ID.
14	    Refer to dma.txt and fsl-mxs-dma.txt for details.
15	  - dma-names: Must be "rx-tx".
16	
17	Optional properties:
18	  - nand-on-flash-bbt: boolean to enable on flash bbt option if not
19	                       present false
20	  - fsl,use-minimum-ecc: Protect this NAND flash with the minimum ECC
21	                       strength required. The required ECC strength is
22	                       automatically discoverable for some flash
23	                       (e.g., according to the ONFI standard).
24	                       However, note that if this strength is not
25	                       discoverable or this property is not enabled,
26	                       the software may chooses an implementation-defined
27	                       ECC scheme.
28	  - fsl,no-blockmark-swap: Don't swap the bad block marker from the OOB
29	                       area with the byte in the data area but rely on the
30	                       flash based BBT for identifying bad blocks.
31	                       NOTE: this is only valid in conjunction with
32	                             'nand-on-flash-bbt'.
33	                       WARNING: on i.MX28 blockmark swapping cannot be
34	                       disabled for the BootROM in the FCB. Thus,
35	                       partitions written from Linux with this feature
36	                       turned on may not be accessible by the BootROM
37	                       code.
38	
39	The device tree may optionally contain sub-nodes describing partitions of the
40	address space. See partition.txt for more detail.
41	
42	Examples:
43	
44	gpmi-nand@8000c000 {
45		compatible = "fsl,imx28-gpmi-nand";
46		#address-cells = <1>;
47		#size-cells = <1>;
48		reg = <0x8000c000 2000>, <0x8000a000 2000>;
49		reg-names = "gpmi-nand", "bch";
50		interrupts = <41>;
51		interrupt-names = "bch";
52		dmas = <&dma_apbh 4>;
53		dma-names = "rx-tx";
54	
55		partition@0 {
56		...
57		};
58	};
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