Commit ce069484 authored by Ivan T. Ivanov's avatar Ivan T. Ivanov Committed by Jonathan Cameron

iio: iadc: Qualcomm SPMI PMIC current ADC driver

The current ADC is peripheral of Qualcomm SPMI PMIC chips. It has
16 bits resolution and register space inside PMIC accessible across
SPMI bus.

The driver registers itself through IIO interface.
Signed-off-by: default avatarIvan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent e0922e5e
Qualcomm's SPMI PMIC current ADC
QPNP PMIC current ADC (IADC) provides interface to clients to read current.
A 16 bit ADC is used for current measurements. IADC can measure the current
through an external resistor (channel 1) or internal (built-in) resistor
(channel 0). When using an external resistor it is to be described by
qcom,external-resistor-micro-ohms property.
IADC node:
- compatible:
Usage: required
Value type: <string>
Definition: Should contain "qcom,spmi-iadc".
- reg:
Usage: required
Value type: <prop-encoded-array>
Definition: IADC base address and length in the SPMI PMIC register map
- interrupts:
Usage: optional
Value type: <prop-encoded-array>
Definition: End of ADC conversion.
- qcom,external-resistor-micro-ohms:
Usage: optional
Value type: <u32>
Definition: Sense resister value in micro Ohm.
If not defined value of 10000 micro Ohms will be used.
Example:
/* IADC node */
pmic_iadc: iadc@3600 {
compatible = "qcom,spmi-iadc";
reg = <0x3600 0x100>;
interrupts = <0x0 0x36 0x0 IRQ_TYPE_EDGE_RISING>;
qcom,external-resistor-micro-ohms = <10000>;
#io-channel-cells = <1>;
};
/* IIO client node */
bat {
io-channels = <&pmic_iadc 0>;
io-channel-names = "iadc";
};
......@@ -206,6 +206,20 @@ config NAU7802
To compile this driver as a module, choose M here: the
module will be called nau7802.
config QCOM_SPMI_IADC
tristate "Qualcomm SPMI PMIC current ADC"
depends on SPMI
select REGMAP_SPMI
help
This is the IIO Current ADC driver for Qualcomm QPNP IADC Chip.
The driver supports single mode operation to read from one of two
channels (external or internal). Hardware have additional
channels internally used for gain and offset calibration.
To compile this driver as a module, choose M here: the module will
be called qcom-spmi-iadc.
config ROCKCHIP_SARADC
tristate "Rockchip SARADC driver"
depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST)
......
......@@ -22,6 +22,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
obj-$(CONFIG_NAU7802) += nau7802.o
obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o
......
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