Linux Device Drivers Development

Regulator device requesting

Prior to gaining access to a regulator, the consumer has to request the kernel by means of the regulator_get() function. It is also possible to use the managed version, the devm_regulator_get() function:

struct regulator *regulator_get(struct device *dev, 
const char *id) 

An example of using this function is as follows:

    reg = regulator_get(dev, "Vcc"); 

The consumer passes in its struct device pointer and power supply ID. The core will try to find the correct regulator by consulting the DT or a machine-specific lookup table. If we focus only on the device tree, *id should match the <name> pattern of the regulator supply in the device tree. If the lookup is successful then this call will return a pointer to the ...