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authorLiam Girdwood <lg@opensource.wolfsonmicro.com>2008-04-30 17:22:50 +0100
committerLiam Girdwood <lg@opensource.wolfsonmicro.com>2008-07-30 10:10:22 +0100
commite7d0fe340557b202dc00135ab3cc877db794a01f (patch)
tree3ba6bec545c6939411a5d5b3fb40d9e4382a5128 /Documentation/power
parente8695ebe5568921c41c269f4434e17590735865c (diff)
downloadop-kernel-dev-e7d0fe340557b202dc00135ab3cc877db794a01f.zip
op-kernel-dev-e7d0fe340557b202dc00135ab3cc877db794a01f.tar.gz
regulator: documentation - machine
This adds documenation describing the regulator machine interface. Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
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+Regulator Machine Driver Interface
+===================================
+
+The regulator machine driver interface is intended for board/machine specific
+initialisation code to configure the regulator subsystem. Typical things that
+machine drivers would do are :-
+
+ 1. Regulator -> Device mapping.
+ 2. Regulator supply configuration.
+ 3. Power Domain constraint setting.
+
+
+
+1. Regulator -> device mapping
+==============================
+Consider the following machine :-
+
+ Regulator-1 -+-> Regulator-2 --> [Consumer A @ 1.8 - 2.0V]
+ |
+ +-> [Consumer B @ 3.3V]
+
+The drivers for consumers A & B must be mapped to the correct regulator in
+order to control their power supply. This mapping can be achieved in machine
+initialisation code by calling :-
+
+int regulator_set_device_supply(const char *regulator, struct device *dev,
+ const char *supply);
+
+and is shown with the following code :-
+
+regulator_set_device_supply("Regulator-1", devB, "Vcc");
+regulator_set_device_supply("Regulator-2", devA, "Vcc");
+
+This maps Regulator-1 to the 'Vcc' supply for Consumer B and maps Regulator-2
+to the 'Vcc' supply for Consumer A.
+
+
+2. Regulator supply configuration.
+==================================
+Consider the following machine (again) :-
+
+ Regulator-1 -+-> Regulator-2 --> [Consumer A @ 1.8 - 2.0V]
+ |
+ +-> [Consumer B @ 3.3V]
+
+Regulator-1 supplies power to Regulator-2. This relationship must be registered
+with the core so that Regulator-1 is also enabled when Consumer A enables it's
+supply (Regulator-2).
+
+This relationship can be register with the core via :-
+
+int regulator_set_supply(const char *regulator, const char *regulator_supply);
+
+In this example we would use the following code :-
+
+regulator_set_supply("Regulator-2", "Regulator-1");
+
+Relationships can be queried by calling :-
+
+const char *regulator_get_supply(const char *regulator);
+
+
+3. Power Domain constraint setting.
+===================================
+Each power domain within a system has physical constraints on voltage and
+current. This must be defined in software so that the power domain is always
+operated within specifications.
+
+Consider the following machine (again) :-
+
+ Regulator-1 -+-> Regulator-2 --> [Consumer A @ 1.8 - 2.0V]
+ |
+ +-> [Consumer B @ 3.3V]
+
+This gives us two regulators and two power domains:
+
+ Domain 1: Regulator-2, Consumer B.
+ Domain 2: Consumer A.
+
+Constraints can be registered by calling :-
+
+int regulator_set_platform_constraints(const char *regulator,
+ struct regulation_constraints *constraints);
+
+The example is defined as follows :-
+
+struct regulation_constraints domain_1 = {
+ .min_uV = 3300000,
+ .max_uV = 3300000,
+ .valid_modes_mask = REGULATOR_MODE_NORMAL,
+};
+
+struct regulation_constraints domain_2 = {
+ .min_uV = 1800000,
+ .max_uV = 2000000,
+ .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
+ .valid_modes_mask = REGULATOR_MODE_NORMAL,
+};
+
+regulator_set_platform_constraints("Regulator-1", &domain_1);
+regulator_set_platform_constraints("Regulator-2", &domain_2);
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