1Atmel system registers
2
3Chipid required properties:
4- compatible: Should be "atmel,sama5d2-chipid"
5- reg : Should contain registers location and length
6
7PIT Timer required properties:
8- compatible: Should be "atmel,at91sam9260-pit"
9- reg: Should contain registers location and length
10- interrupts: Should contain interrupt for the PIT which is the IRQ line
11  shared across all System Controller members.
12
13PIT64B Timer required properties:
14- compatible: Should be "microchip,sam9x60-pit64b"
15- reg: Should contain registers location and length
16- interrupts: Should contain interrupt for PIT64B timer
17- clocks: Should contain the available clock sources for PIT64B timer.
18
19System Timer (ST) required properties:
20- compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
21- reg: Should contain registers location and length
22- interrupts: Should contain interrupt for the ST which is the IRQ line
23  shared across all System Controller members.
24- clocks: phandle to input clock.
25Its subnodes can be:
26- watchdog: compatible should be "atmel,at91rm9200-wdt"
27
28RSTC Reset Controller required properties:
29- compatible: Should be "atmel,<chip>-rstc".
30  <chip> can be "at91sam9260", "at91sam9g45", "sama5d3" or "samx7"
31  it also can be "microchip,sam9x60-rstc"
32- reg: Should contain registers location and length
33- clocks: phandle to input clock.
34
35Example:
36
37	rstc@fffffd00 {
38		compatible = "atmel,at91sam9260-rstc";
39		reg = <0xfffffd00 0x10>;
40		clocks = <&clk32k>;
41	};
42
43RAMC SDRAM/DDR Controller required properties:
44- compatible: Should be "atmel,at91rm9200-sdramc", "syscon"
45			"atmel,at91sam9260-sdramc",
46			"atmel,at91sam9g45-ddramc",
47			"atmel,sama5d3-ddramc",
48			"microchip,sam9x60-ddramc"
49- reg: Should contain registers location and length
50
51Examples:
52
53	ramc0: ramc@ffffe800 {
54		compatible = "atmel,at91sam9g45-ddramc";
55		reg = <0xffffe800 0x200>;
56	};
57
58SHDWC Shutdown Controller
59
60required properties:
61- compatible: Should be "atmel,<chip>-shdwc".
62  <chip> can be "at91sam9260", "at91sam9rl" or "at91sam9x5".
63- reg: Should contain registers location and length
64- clocks: phandle to input clock.
65
66optional properties:
67- atmel,wakeup-mode: String, operation mode of the wakeup mode.
68  Supported values are: "none", "high", "low", "any".
69- atmel,wakeup-counter: Counter on Wake-up 0 (between 0x0 and 0xf).
70
71optional at91sam9260 properties:
72- atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
73
74optional at91sam9rl properties:
75- atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
76- atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
77
78optional at91sam9x5 properties:
79- atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
80
81Example:
82
83	shdwc@fffffd10 {
84		compatible = "atmel,at91sam9260-shdwc";
85		reg = <0xfffffd10 0x10>;
86		clocks = <&clk32k>;
87	};
88
89SHDWC SAMA5D2-Compatible Shutdown Controller
90
911) shdwc node
92
93required properties:
94- compatible: should be "atmel,sama5d2-shdwc" or "microchip,sam9x60-shdwc".
95- reg: should contain registers location and length
96- clocks: phandle to input clock.
97- #address-cells: should be one. The cell is the wake-up input index.
98- #size-cells: should be zero.
99
100optional properties:
101
102- debounce-delay-us: minimum wake-up inputs debouncer period in
103  microseconds. It's usually a board-related property.
104- atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
105
106optional microchip,sam9x60-shdwc properties:
107- atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
108
109The node contains child nodes for each wake-up input that the platform uses.
110
1112) input nodes
112
113Wake-up input nodes are usually described in the "board" part of the Device
114Tree. Note also that input 0 is linked to the wake-up pin and is frequently
115used.
116
117Required properties:
118- reg: should contain the wake-up input index [0 - 15].
119
120Optional properties:
121- atmel,wakeup-active-high: boolean, the corresponding wake-up input described
122  by the child, forces the wake-up of the core power supply on a high level.
123  The default is to be active low.
124
125Example:
126
127On the SoC side:
128	shdwc@f8048010 {
129		compatible = "atmel,sama5d2-shdwc";
130		reg = <0xf8048010 0x10>;
131		clocks = <&clk32k>;
132		#address-cells = <1>;
133		#size-cells = <0>;
134		atmel,wakeup-rtc-timer;
135	};
136
137On the board side:
138	shdwc@f8048010 {
139		debounce-delay-us = <976>;
140
141		input@0 {
142			reg = <0>;
143		};
144
145		input@1 {
146			reg = <1>;
147			atmel,wakeup-active-high;
148		};
149	};
150
151Special Function Registers (SFR)
152
153Special Function Registers (SFR) manage specific aspects of the integrated
154memory, bridge implementations, processor and other functionality not controlled
155elsewhere.
156
157required properties:
158- compatible: Should be "atmel,<chip>-sfr", "syscon" or
159	"atmel,<chip>-sfrbu", "syscon"
160  <chip> can be "sama5d3", "sama5d4" or "sama5d2".
161  It also can be "microchip,sam9x60-sfr", "syscon".
162- reg: Should contain registers location and length
163
164	sfr@f0038000 {
165		compatible = "atmel,sama5d3-sfr", "syscon";
166		reg = <0xf0038000 0x60>;
167	};
168
169Security Module (SECUMOD)
170
171The Security Module macrocell provides all necessary secure functions to avoid
172voltage, temperature, frequency and mechanical attacks on the chip. It also
173embeds secure memories that can be scrambled.
174
175The Security Module also offers the PIOBU pins which can be used as GPIO pins.
176Note that they maintain their voltage during Backup/Self-refresh.
177
178required properties:
179- compatible: Should be "atmel,<chip>-secumod", "syscon".
180  <chip> can be "sama5d2".
181- reg: Should contain registers location and length
182- gpio-controller:	Marks the port as GPIO controller.
183- #gpio-cells:		There are 2. The pin number is the
184			first, the second represents additional
185			parameters such as GPIO_ACTIVE_HIGH/LOW.
186
187
188	secumod@fc040000 {
189		compatible = "atmel,sama5d2-secumod", "syscon";
190		reg = <0xfc040000 0x100>;
191		gpio-controller;
192		#gpio-cells = <2>;
193	};
194