1* Device tree bindings for Atmel EBI
2
3The External Bus Interface (EBI) controller is a bus where you can connect
4asynchronous (NAND, NOR, SRAM, ....) and synchronous memories (SDR/DDR SDRAMs).
5The EBI provides a glue-less interface to asynchronous memories through the SMC
6(Static Memory Controller).
7
8Required properties:
9
10- compatible:		"atmel,at91sam9260-ebi"
11			"atmel,at91sam9261-ebi"
12			"atmel,at91sam9263-ebi0"
13			"atmel,at91sam9263-ebi1"
14			"atmel,at91sam9rl-ebi"
15			"atmel,at91sam9g45-ebi"
16			"atmel,at91sam9x5-ebi"
17			"atmel,sama5d3-ebi"
18
19- reg:			Contains offset/length value for EBI memory mapping.
20			This property might contain several entries if the EBI
21			memory range is not contiguous
22
23- #address-cells:	Must be 2.
24			The first cell encodes the CS.
25			The second cell encode the offset into the CS memory
26			range.
27
28- #size-cells:		Must be set to 1.
29
30- ranges:		Encodes CS to memory region association.
31
32- clocks:		Clock feeding the EBI controller.
33			See clock-bindings.txt
34
35Children device nodes are representing device connected to the EBI bus.
36
37Required device node properties:
38
39- reg:			Contains the chip-select id, the offset and the length
40			of the memory region requested by the device.
41
42EBI bus configuration will be defined directly in the device subnode.
43
44Optional EBI/SMC properties:
45
46- atmel,smc-bus-width:		width of the asynchronous device's data bus
47				8, 16 or 32.
48				Default to 8 when undefined.
49
50- atmel,smc-byte-access-type	"write" or "select" (see Atmel datasheet).
51				Default to "select" when undefined.
52
53- atmel,smc-read-mode		"nrd" or "ncs".
54				Default to "ncs" when undefined.
55
56- atmel,smc-write-mode		"nwe" or "ncs".
57				Default to "ncs" when undefined.
58
59- atmel,smc-exnw-mode		"disabled", "frozen" or "ready".
60				Default to "disabled" when undefined.
61
62- atmel,smc-page-mode		enable page mode if present. The provided value
63				defines the page size (supported values: 4, 8,
64				16 and 32).
65
66- atmel,smc-tdf-mode:		"normal" or "optimized". When set to
67				"optimized" the data float time is optimized
68				depending on the next device being accessed
69				(next device setup time is subtracted to the
70				current device data float time).
71				Default to "normal" when undefined.
72
73If at least one atmel,smc- property is defined the following SMC timing
74properties become mandatory. In the other hand, if none of the atmel,smc-
75properties are specified, we assume that the EBI bus configuration will be
76handled by the sub-device driver, and none of those properties should be
77defined.
78
79All the timings are expressed in nanoseconds (see Atmel datasheet for a full
80description).
81
82- atmel,smc-ncs-rd-setup-ns
83- atmel,smc-nrd-setup-ns
84- atmel,smc-ncs-wr-setup-ns
85- atmel,smc-nwe-setup-ns
86- atmel,smc-ncs-rd-pulse-ns
87- atmel,smc-nrd-pulse-ns
88- atmel,smc-ncs-wr-pulse-ns
89- atmel,smc-nwe-pulse-ns
90- atmel,smc-nwe-cycle-ns
91- atmel,smc-nrd-cycle-ns
92- atmel,smc-tdf-ns
93
94Example:
95
96	ebi: ebi@10000000 {
97		compatible = "atmel,sama5d3-ebi";
98		#address-cells = <2>;
99		#size-cells = <1>;
100		atmel,smc = <&hsmc>;
101		atmel,matrix = <&matrix>;
102		reg = <0x10000000 0x10000000
103		       0x40000000 0x30000000>;
104		ranges = <0x0 0x0 0x10000000 0x10000000
105			  0x1 0x0 0x40000000 0x10000000
106			  0x2 0x0 0x50000000 0x10000000
107			  0x3 0x0 0x60000000 0x10000000>;
108		clocks = <&mck>;
109
110		pinctrl-names = "default";
111		pinctrl-0 = <&pinctrl_ebi_addr>;
112
113		nor: flash@0,0 {
114			compatible = "cfi-flash";
115			#address-cells = <1>;
116			#size-cells = <1>;
117			reg = <0x0 0x0 0x1000000>;
118			bank-width = <2>;
119
120			atmel,smc-read-mode = "nrd";
121			atmel,smc-write-mode = "nwe";
122			atmel,smc-bus-width = <16>;
123			atmel,smc-ncs-rd-setup-ns = <0>;
124			atmel,smc-ncs-wr-setup-ns = <0>;
125			atmel,smc-nwe-setup-ns = <8>;
126			atmel,smc-nrd-setup-ns = <16>;
127			atmel,smc-ncs-rd-pulse-ns = <84>;
128			atmel,smc-ncs-wr-pulse-ns = <84>;
129			atmel,smc-nrd-pulse-ns = <76>;
130			atmel,smc-nwe-pulse-ns = <76>;
131			atmel,smc-nrd-cycle-ns = <107>;
132			atmel,smc-nwe-cycle-ns = <84>;
133			atmel,smc-tdf-ns = <16>;
134		};
135	};
136
137