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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
Adaptive Body Bias(ABB) SoC internal LDO regulator for Texas Instruments SoCs
Required Properties:
- compatible: Should be one of:
- "ti,abb-v1" for older SoCs like OMAP3
- "ti,abb-v2" for newer SoCs like OMAP4, OMAP5
- "ti,abb-v3" for a generic definition where setup and control registers are
provided (example: DRA7)
- reg: Address and length of the register set for the device. It contains
the information of registers in the same order as described by reg-names
- reg-names: Should contain the reg names
- "base-address" - contains base address of ABB module (ti,abb-v1,ti,abb-v2)
- "control-address" - contains control register address of ABB module (ti,abb-v3)
- "setup-address" - contains setup register address of ABB module (ti,abb-v3)
- "int-address" - contains address of interrupt register for ABB module
(also see Optional properties)
- #address-cells: should be 0
- #size-cells: should be 0
- clocks: should point to the clock node used by ABB module
- ti,settling-time: Settling time in uSecs from SoC documentation for ABB module
to settle down(target time for SR2_WTCNT_VALUE).
- ti,clock-cycles: SoC specific data about count of system ti,clock-cycles used for
computing settling time from SoC Documentation for ABB module(clock
cycles for SR2_WTCNT_VALUE).
- ti,tranxdone-status-mask: Mask to the int-register to write-to-clear mask
indicating LDO tranxdone (operation complete).
- ti,abb_info: An array of 6-tuples u32 items providing information about ABB
configuration needed per operational voltage of the device.
Each item consists of the following in the same order:
volt: voltage in uV - Only used to index ABB information.
ABB mode: one of the following:
0-bypass
1-Forward Body Bias(FBB)
3-Reverse Body Bias(RBB)
efuse: (see Optional properties)
RBB enable efuse Mask: (See Optional properties)
FBB enable efuse Mask: (See Optional properties)
Vset value efuse Mask: (See Optional properties)
NOTE: If more than 1 entry is present, then regulator is setup to change
voltage, allowing for various modes to be selected indexed off
the regulator. Further, ABB LDOs are considered always-on by
default.
Optional Properties:
- reg-names: In addition to the required properties, the following are optional
- "efuse-address" - Contains efuse base address used to pick up ABB info.
- "ldo-address" - Contains address of ABB LDO override register.
"efuse-address" is required for this.
- ti,ldovbb-vset-mask - Required if ldo-address is set, mask for LDO override
register to provide override vset value.
- ti,ldovbb-override-mask - Required if ldo-address is set, mask for LDO
override register to enable override vset value.
- ti,abb_opp_sel: Addendum to the description in required properties
efuse: Mandatory if 'efuse-address' register is defined. Provides offset
from efuse-address to pick up ABB characteristics. Set to 0 if
'efuse-address' is not defined.
RBB enable efuse Mask: Optional if 'efuse-address' register is defined.
'ABB mode' is force set to RBB mode if value at "efuse-address"
+ efuse maps to RBB mask. Set to 0 to ignore this.
FBB enable efuse Mask: Optional if 'efuse-address' register is defined.
'ABB mode' is force set to FBB mode if value at "efuse-address"
+ efuse maps to FBB mask (valid only if RBB mask does not match)
Set to 0 to ignore this.
Vset value efuse Mask: Mandatory if ldo-address is set. Picks up from
efuse the value to set in 'ti,ldovbb-vset-mask' at ldo-address.
Example #1: Simplest configuration (no efuse data, hard coded ABB table):
abb_x: regulator-abb-x {
compatible = "ti,abb-v1";
regulator-name = "abb_x";
#address-cells = <0>;
#size-cells = <0>;
reg = <0x483072f0 0x8>, <0x48306818 0x4>;
reg-names = "base-address", "int-address";
ti,tranxdone-status-mask = <0x4000000>;
clocks = <&sysclk>;
ti,settling-time = <30>;
ti,clock-cycles = <8>;
ti,abb_info = <
/* uV ABB efuse rbb_m fbb_m vset_m */
1012500 0 0 0 0 0 /* Bypass */
1200000 3 0 0 0 0 /* RBB mandatory */
1320000 1 0 0 0 0 /* FBB mandatory */
>;
};
Example #2: Efuse bits contain ABB mode setting (no LDO override capability)
abb_y: regulator-abb-y {
compatible = "ti,abb-v2";
regulator-name = "abb_y";
#address-cells = <0>;
#size-cells = <0>;
reg = <0x4a307bd0 0x8>, <0x4a306014 0x4>, <0x4A002268 0x8>;
reg-names = "base-address", "int-address", "efuse-address";
ti,tranxdone-status-mask = <0x4000000>;
clocks = <&sysclk>;
ti,settling-time = <50>;
ti,clock-cycles = <16>;
ti,abb_info = <
/* uV ABB efuse rbb_m fbb_m vset_m */
975000 0 0 0 0 0 /* Bypass */
1012500 0 0 0x40000 0 0 /* RBB optional */
1200000 0 0x4 0 0x40000 0 /* FBB optional */
1320000 1 0 0 0 0 /* FBB mandatory */
>;
};
Example #3: Efuse bits contain ABB mode setting and LDO override capability
abb_z: regulator-abb-z {
compatible = "ti,abb-v2";
regulator-name = "abb_z";
#address-cells = <0>;
#size-cells = <0>;
reg = <0x4ae07ce4 0x8>, <0x4ae06010 0x4>,
<0x4a002194 0x8>, <0x4ae0C314 0x4>;
reg-names = "base-address", "int-address",
"efuse-address", "ldo-address";
ti,tranxdone-status-mask = <0x8000000>;
/* LDOVBBMM_MUX_CTRL */
ti,ldovbb-override-mask = <0x400>;
/* LDOVBBMM_VSET_OUT */
ti,ldovbb-vset-mask = <0x1F>;
clocks = <&sysclk>;
ti,settling-time = <50>;
ti,clock-cycles = <16>;
ti,abb_info = <
/* uV ABB efuse rbb_m fbb_m vset_m */
975000 0 0 0 0 0 /* Bypass */
1200000 0 0x4 0 0x40000 0x1f00 /* FBB optional, vset */
>;
};
|
