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Documentation / devicetree / bindings / mtd / gpmc-nor.txt




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Based on kernel version 3.16. Page generated on 2014-08-06 21:37 EST.

1	Device tree bindings for NOR flash connect to TI GPMC
2	
3	NOR flash connected to the TI GPMC (found on OMAP boards) are represented as
4	child nodes of the GPMC controller with a name of "nor".
5	
6	All timing relevant properties as well as generic GPMC child properties are
7	explained in a separate documents. Please refer to
8	Documentation/devicetree/bindings/bus/ti-gpmc.txt
9	
10	Required properties:
11	- bank-width: 		Width of NOR flash in bytes. GPMC supports 8-bit and
12				16-bit devices and so must be either 1 or 2 bytes.
13	- compatible:		Documentation/devicetree/bindings/mtd/mtd-physmap.txt
14	- gpmc,cs-on-ns:		Chip-select assertion time
15	- gpmc,cs-rd-off-ns:	Chip-select de-assertion time for reads
16	- gpmc,cs-wr-off-ns:	Chip-select de-assertion time for writes
17	- gpmc,oe-on-ns:	Output-enable assertion time
18	- gpmc,oe-off-ns:	Output-enable de-assertion time
19	- gpmc,we-on-ns		Write-enable assertion time
20	- gpmc,we-off-ns:	Write-enable de-assertion time
21	- gpmc,access-ns:	Start cycle to first data capture (read access)
22	- gpmc,rd-cycle-ns:	Total read cycle time
23	- gpmc,wr-cycle-ns:	Total write cycle time
24	- linux,mtd-name:	Documentation/devicetree/bindings/mtd/mtd-physmap.txt
25	- reg:			Chip-select, base address (relative to chip-select)
26				and size of NOR flash. Note that base address will be
27				typically 0 as this is the start of the chip-select.
28	
29	Optional properties:
30	- gpmc,XXX		Additional GPMC timings and settings parameters. See
31				Documentation/devicetree/bindings/bus/ti-gpmc.txt
32	
33	Optional properties for partition table parsing:
34	- #address-cells: should be set to 1
35	- #size-cells: should be set to 1
36	
37	Example:
38	
39	gpmc: gpmc@6e000000 {
40		compatible = "ti,omap3430-gpmc", "simple-bus";
41		ti,hwmods = "gpmc";
42		reg = <0x6e000000 0x1000>;
43		interrupts = <20>;
44		gpmc,num-cs = <8>;
45		gpmc,num-waitpins = <4>;
46		#address-cells = <2>;
47		#size-cells = <1>;
48	
49		ranges = <0 0 0x10000000 0x08000000>;
50	
51		nor@0,0 {
52			compatible = "cfi-flash";
53			linux,mtd-name= "intel,pf48f6000m0y1be";
54			#address-cells = <1>;
55			#size-cells = <1>;
56			reg = <0 0 0x08000000>;
57			bank-width = <2>;
58	
59			gpmc,mux-add-data;
60			gpmc,cs-on-ns = <0>;
61			gpmc,cs-rd-off-ns = <186>;
62			gpmc,cs-wr-off-ns = <186>;
63			gpmc,adv-on-ns = <12>;
64			gpmc,adv-rd-off-ns = <48>;
65			gpmc,adv-wr-off-ns = <48>;
66			gpmc,oe-on-ns = <54>;
67			gpmc,oe-off-ns = <168>;
68			gpmc,we-on-ns = <54>;
69			gpmc,we-off-ns = <168>;
70			gpmc,rd-cycle-ns = <186>;
71			gpmc,wr-cycle-ns = <186>;
72			gpmc,access-ns = <114>;
73			gpmc,page-burst-access-ns = <6>;
74			gpmc,bus-turnaround-ns = <12>;
75			gpmc,cycle2cycle-delay-ns = <18>;
76			gpmc,wr-data-mux-bus-ns = <90>;
77			gpmc,wr-access-ns = <186>;
78			gpmc,cycle2cycle-samecsen;
79			gpmc,cycle2cycle-diffcsen;
80	
81			partition@0 {
82				label = "bootloader-nor";
83				reg = <0 0x40000>;
84			};
85			partition@0x40000 {
86				label = "params-nor";
87				reg = <0x40000 0x40000>;
88			};
89			partition@0x80000 {
90				label = "kernel-nor";
91				reg = <0x80000 0x200000>;
92			};
93			partition@0x280000 {
94				label = "filesystem-nor";
95				reg = <0x240000 0x7d80000>;
96			};
97		};
98	};
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