1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
ARM Versatile Express system registers
--------------------------------------
This is a system control registers block, providing multiple low level
platform functions like board detection and identification, software
interrupt generation, MMC and NOR Flash control etc.
Required node properties:
- compatible value : = "arm,vexpress,sysreg";
- reg : physical base address and the size of the registers window
Deprecated properties, replaced by GPIO subnodes (see below):
- gpio-controller : specifies that the node is a GPIO controller
- #gpio-cells : size of the GPIO specifier, should be 2:
- first cell is the pseudo-GPIO line number:
0 - MMC CARDIN
1 - MMC WPROT
2 - NOR FLASH WPn
- second cell can take standard GPIO flags (currently ignored).
Control registers providing pseudo-GPIO lines must be represented
by subnodes, each of them requiring the following properties:
- compatible value : one of
"arm,vexpress-sysreg,sys_led"
"arm,vexpress-sysreg,sys_mci"
"arm,vexpress-sysreg,sys_flash"
- gpio-controller : makes the node a GPIO controller
- #gpio-cells : size of the GPIO specifier, must be 2:
- first cell is the function number:
- for sys_led : 0..7 = LED 0..7
- for sys_mci : 0 = MMC CARDIN, 1 = MMC WPROT
- for sys_flash : 0 = NOR FLASH WPn
- second cell can take standard GPIO flags (currently ignored).
Example:
v2m_sysreg: sysreg@10000000 {
compatible = "arm,vexpress-sysreg";
reg = <0x10000000 0x1000>;
v2m_led_gpios: sys_led@8 {
compatible = "arm,vexpress-sysreg,sys_led";
gpio-controller;
#gpio-cells = <2>;
};
v2m_mmc_gpios: sys_mci@48 {
compatible = "arm,vexpress-sysreg,sys_mci";
gpio-controller;
#gpio-cells = <2>;
};
v2m_flash_gpios: sys_flash@4c {
compatible = "arm,vexpress-sysreg,sys_flash";
gpio-controller;
#gpio-cells = <2>;
};
};
This block also can also act a bridge to the platform's configuration
bus via "system control" interface, addressing devices with site number,
position in the board stack, config controller, function and device
numbers - see motherboard's TRM for more details. All configuration
controller accessible via this interface must reference the sysreg
node via "arm,vexpress,config-bridge" phandle and define appropriate
topology properties - see main vexpress node documentation for more
details. Each child of such node describes one function and must
define the following properties:
- compatible value : must be one of (corresponding to the TRM):
"arm,vexpress-amp"
"arm,vexpress-dvimode"
"arm,vexpress-energy"
"arm,vexpress-muxfpga"
"arm,vexpress-osc"
"arm,vexpress-power"
"arm,vexpress-reboot"
"arm,vexpress-reset"
"arm,vexpress-scc"
"arm,vexpress-shutdown"
"arm,vexpress-temp"
"arm,vexpress-volt"
- arm,vexpress-sysreg,func : must contain a set of two cells long groups:
- first cell of each group defines the function number
(eg. 1 for clock generator, 2 for voltage regulators etc.)
- second cell of each group defines device number (eg. osc 0,
osc 1 etc.)
- some functions (eg. energy meter, with its 64 bit long counter)
are using more than one function/device number pair
Example:
mcc {
compatible = "arm,vexpress,config-bus";
arm,vexpress,config-bridge = <&v2m_sysreg>;
osc@0 {
compatible = "arm,vexpress-osc";
arm,vexpress-sysreg,func = <1 0>;
};
energy@0 {
compatible = "arm,vexpress-energy";
arm,vexpress-sysreg,func = <13 0>, <13 1>;
};
};
|
