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dt-bindings: iio: qcom,spmi-vadc: Add SW-calibrated ADC bindings

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Add bindings for SW-calibrated ADC used on PMR735A/PMR735B on
targets which don't have PMK8350 running in master mode.

Change-Id: I753b3caf1e52ac9920a9df32cbef465277409700
This commit is contained in:
Jishnu Prakash 2021-06-29 16:41:46 +05:30 • committed by Gerrit - the friendly Code Review server
commit d02c277821
1 changed files with 55 additions and 5 deletions
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60
bindings/iio/adc/qcom,spmi-vadc.txt
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@ -11,12 +11,13 @@ VADC node:
Usage: required
Value type: <string>
Definition: Should contain "qcom,spmi-vadc".
Should contain "qcom,spmi-adc5-gen3" for PMIC5 Gen3 ADC driver.
Should contain "qcom,spmi-adc7" for PMIC7 ADC driver.
Should contain "qcom,spmi-adc5" for PMIC5 ADC driver.
Should contain "qcom,spmi-adc-rev2" for PMIC rev2 ADC driver.
Should contain "qcom,spmi-adc5-gen3" for PMIC5 Gen3 ADC.
Should contain "qcom,spmi-adc7" for PMIC7 ADC.
Should contain "qcom,spmi-adc5" for PMIC5 ADC.
Should contain "qcom,spmi-adc-rev2" for PMIC rev2 ADC.
Should contain "qcom,pms405-adc" for PMS405 PMIC
Should contain "qcom,spmi-adc5-lite" for PMIC5 ADC-lite driver.
Should contain "qcom,spmi-adc5-lite" for PMIC5 ADC-lite.
Should contain "qcom,spmi-adc7-sw-calib" for PMIC7 SW-calibrated ADC.
- reg:
Usage: required
Value type: <prop-encoded-array>
@ -108,6 +109,19 @@ Channel node properties:
If property is not found, channel will be calibrated with 0V
and 1.25V reference channels, also known as absolute calibration.
- qcom,no-cal:
Usage: optional
Value type: <empty>
Definition: Channel calibration type.
- For compatible property "qcom,spmi-adc7-sw-calib", if this property
is specified for a channel, VADC will not use any reference channels
for that channel's calibration. It is needed for the three calibration
channels alone (ADC7_REF_GND, ADC7_1P25VREF and ADC7_VREF_VADC),
mutually exclusive with ratiometric calibration and not meant for any
other compatible property. If property is not found, channel will be
calibrated with 0.625V and 1.25V reference channels, also known as
absolute calibration.
- qcom,hw-settle-time:
Usage: optional
Value type: <u32>
@ -187,6 +201,11 @@ configuration nodes should be defined:
VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
VADC_GND_REF and VADC_VDD_VADC.
For compatible property "qcom,spmi-adc7-sw-calib" following channels, also
known as reference point channels, are used for result calibration and their
channel configuration nodes should be defined:
ADC7_REF_GND, ADC7_1P25VREF and ADC7_VREF_VADC.
Example1:
#include <dt-bindings/iio/qcom,spmi-vadc.h>
@ -265,3 +284,34 @@ Example2:
io-channels = <&pm5100_adc PM5100_ADC5_GEN3_VPH_PWR>;
io-channel-names = "vph_pwr";
};
Example3:
#include <dt-bindings/iio/qcom,spmi-vadc.h>
#include <linux/irq.h>
/* ... */
/* VADC node */
pmr735a_vadc: vadc@3600 {
compatible = "qcom,spmi-adc7-sw-calib";
reg = <0x3600>, <0x3900>;
reg-names = "adc5-sw-calib-pbs-base", "adc5-sw-calib-cmn-base";
interrupts = <0x4 0x36 0x0 IRQ_TYPE_EDGE_RISING>;
#address-cells = <1>;
#size-cells = <0>;
#io-channel-cells = <1>;
io-channel-ranges;
/* Channel node */
pmr735a_die_temp {
reg = <ADC7_DIE_TEMP>;
label = "pmr735a_die_temp";
qcom,pre-scaling = <1 1>;
};
};
/* IIO client node */
pmr735a_tz {
io-channels = <&pmr735a_vadc ADC7_DIE_TEMP>;
io-channel-names = "thermal";
};