u-boot/doc/device-tree-bindings/pmic/sandbox.txt
Przemyslaw Marczak 5d387d0df9 sandbox: add: sandbox PMIC device drivers: I2C emul, pmic, regulator
This commit adds emulation of sandbox PMIC device, which includes:
- PMIC I2C emulation driver
- PMIC I/O driver (UCLASS_PMIC)
- PMIC regulator driver (UCLASS_REGULATOR)

The sandbox PMIC has 12 significant registers and 4 as padding to 16 bytes,
which allows using 'i2c md' command with the default count (16).

The sandbox PMIC provides regulators:
- 2x BUCK
- 2x LDO

Each, with adjustable output:
- Enable state
- Voltage
- Current limit (LDO1/BUCK1 only)
- Operation mode (different for BUCK and LDO)

Each attribute has it's own register, beside the enable state, which depends
on operation mode.

The header file: sandbox_pmic.h includes PMIC's default register values,
which are set on i2c pmic emul driver's probe() method.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested on sandbox:
Tested-by: Simon Glass <sjg@chromium.org>
2015-05-14 19:58:34 -06:00

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Sandbox pmic
This device uses two drivers:
- drivers/power/pmic/sandbox.c (for parent device)
- drivers/power/regulator/sandbox.c (for child regulators)
This file describes the binding info for the PMIC driver.
To bind the regulators, please read the regulator binding info:
- doc/device-tree-bindings/regulator/sandbox.txt
Required PMIC node properties:
- compatible: "sandbox,pmic"
- reg = 0x40
Required PMIC's "emul" subnode, with property:
- compatible: "sandbox,i2c-pmic"
With the above properties, the pmic device can be used for read/write only.
To bind each regulator, the optional regulator subnodes should exists.
Optional subnodes:
- ldo/buck subnodes of each device's regulator (see regulator binding info)
Example:
sandbox_pmic {
compatible = "sandbox,pmic";
reg = <0x40>;
/* Mandatory for I/O */
emul {
compatible = "sandbox,i2c-pmic";
};
};