Documentation/devicetree/bindings/regulator/ti-abb-regulator.txt

   1 Adaptive Body Bias(ABB) SoC internal LDO regulator for Texas Instruments SoCs
   2
   3 Required Properties:
   4 - compatible: Should be one of:
   5   - "ti,abb-v1" for older SoCs like OMAP3
   6   - "ti,abb-v2" for newer SoCs like OMAP4, OMAP5
   7   - "ti,abb-v3" for a generic definition where setup and control registers are
   8      provided (example: DRA7)
   9 - reg: Address and length of the register set for the device. It contains
  10   the information of registers in the same order as described by reg-names
  11 - reg-names: Should contain the reg names
  12   - "base-address"      - contains base address of ABB module (ti,abb-v1,ti,abb-v2)
  13   - "control-address"   - contains control register address of ABB module (ti,abb-v3)
  14   - "setup-address"     - contains setup register address of ABB module (ti,abb-v3)
  15   - "int-address"       - contains address of interrupt register for ABB module
  16   (also see Optional properties)
  17 - #address-cells: should be 0
  18 - #size-cells: should be 0
  19 - clocks: should point to the clock node used by ABB module
  20 - ti,settling-time: Settling time in uSecs from SoC documentation for ABB module
  21         to settle down(target time for SR2_WTCNT_VALUE).
  22 - ti,clock-cycles: SoC specific data about count of system ti,clock-cycles used for
  23         computing settling time from SoC Documentation for ABB module(clock
  24         cycles for SR2_WTCNT_VALUE).
  25 - ti,tranxdone-status-mask: Mask to the int-register to write-to-clear mask
  26         indicating LDO tranxdone (operation complete).
  27 - ti,abb_info: An array of 6-tuples u32 items providing information about ABB
  28         configuration needed per operational voltage of the device.
  29         Each item consists of the following in the same order:
  30         volt: voltage in uV - Only used to index ABB information.
  31         ABB mode: one of the following:
  32                 0-bypass
  33                 1-Forward Body Bias(FBB)
  34                 3-Reverse Body Bias(RBB)
  35         efuse:  (see Optional properties)
  36         RBB enable efuse Mask:  (See Optional properties)
  37         FBB enable efuse Mask:  (See Optional properties)
  38         Vset value efuse Mask:  (See Optional properties)
  39
  40         NOTE: If more than 1 entry is present, then regulator is setup to change
  41               voltage, allowing for various modes to be selected indexed off
  42               the regulator. Further, ABB LDOs are considered always-on by
  43               default.
  44
  45 Optional Properties:
  46 - reg-names: In addition to the required properties, the following are optional
  47   - "efuse-address"     - Contains efuse base address used to pick up ABB info.
  48   - "ldo-address"       - Contains address of ABB LDO overide register address.
  49         "efuse-address" is required for this.
  50 - ti,ldovbb-vset-mask   - Required if ldo-address is set, mask for LDO override
  51         register to provide override vset value.
  52 - ti,ldovbb-override-mask - Required if ldo-address is set, mask for LDO
  53         override register to enable override vset value.
  54 - ti,abb_opp_sel: Addendum to the description in required properties
  55         efuse: Mandatory if 'efuse-address' register is defined. Provides offset
  56                from efuse-address to pick up ABB characteristics. Set to 0 if
  57                'efuse-address' is not defined.
  58         RBB enable efuse Mask:  Optional if 'efuse-address' register is defined.
  59                 'ABB mode' is force set to RBB mode if value at "efuse-address"
  60                 + efuse maps to RBB mask. Set to 0 to ignore this.
  61         FBB enable efuse Mask:  Optional if 'efuse-address' register is defined.
  62                 'ABB mode' is force set to FBB mode if value at "efuse-address"
  63                 + efuse maps to FBB mask (valid only if RBB mask does not match)
  64                 Set to 0 to ignore this.
  65         Vset value efuse Mask:  Mandatory if ldo-address is set. Picks up from
  66                 efuse the value to set in 'ti,ldovbb-vset-mask' at ldo-address.
  67
  68 Example #1: Simplest configuration (no efuse data, hard coded ABB table):
  69 abb_x: regulator-abb-x {
  70         compatible = "ti,abb-v1";
  71         regulator-name = "abb_x";
  72         #address-cells = <0>;
  73         #size-cells = <0>;
  74         reg = <0x483072f0 0x8>, <0x48306818 0x4>;
  75         reg-names = "base-address", "int-address";
  76         ti,tranxdone-status-mask = <0x4000000>;
  77         clocks = <&sysclk>;
  78         ti,settling-time = <30>;
  79         ti,clock-cycles = <8>;
  80         ti,abb_info = <
  81         /* uV           ABB     efuse   rbb_m   fbb_m   vset_m */
  82         1012500         0       0       0       0       0 /* Bypass */
  83         1200000         3       0       0       0       0 /* RBB mandatory */
  84         1320000         1       0       0       0       0 /* FBB mandatory */
  85         >;
  86 };
  87
  88 Example #2: Efuse bits contain ABB mode setting (no LDO override capability)
  89 abb_y: regulator-abb-y {
  90         compatible = "ti,abb-v2";
  91         regulator-name = "abb_y";
  92         #address-cells = <0>;
  93         #size-cells = <0>;
  94         reg = <0x4a307bd0 0x8>, <0x4a306014 0x4>, <0x4A002268 0x8>;
  95         reg-names = "base-address", "int-address", "efuse-address";
  96         ti,tranxdone-status-mask = <0x4000000>;
  97         clocks = <&sysclk>;
  98         ti,settling-time = <50>;
  99         ti,clock-cycles = <16>;
 100         ti,abb_info = <
 101         /* uV           ABB     efuse   rbb_m   fbb_m   vset_m */
 102         975000          0       0       0       0       0 /* Bypass */
 103         1012500         0       0       0x40000 0       0 /* RBB optional */
 104         1200000         0       0x4     0       0x40000 0 /* FBB optional */
 105         1320000         1       0       0       0       0 /* FBB mandatory */
 106         >;
 107 };
 108
 109 Example #3: Efuse bits contain ABB mode setting and LDO override capability
 110 abb_z: regulator-abb-z {
 111         compatible = "ti,abb-v2";
 112         regulator-name = "abb_z";
 113         #address-cells = <0>;
 114         #size-cells = <0>;
 115         reg = <0x4ae07ce4 0x8>, <0x4ae06010 0x4>,
 116               <0x4a002194 0x8>, <0x4ae0C314 0x4>;
 117         reg-names = "base-address", "int-address",
 118                     "efuse-address", "ldo-address";
 119         ti,tranxdone-status-mask = <0x8000000>;
 120         /* LDOVBBMM_MUX_CTRL */
 121         ti,ldovbb-override-mask = <0x400>;
 122         /* LDOVBBMM_VSET_OUT */
 123         ti,ldovbb-vset-mask = <0x1F>;
 124         clocks = <&sysclk>;
 125         ti,settling-time = <50>;
 126         ti,clock-cycles = <16>;
 127         ti,abb_info = <
 128         /* uV   ABB     efuse   rbb_m   fbb_m   vset_m */
 129         975000  0       0       0       0       0       /* Bypass */
 130         1200000 0       0x4     0       0x40000 0x1f00  /* FBB optional, vset */
 131         >;
 132 };