| Message ID | 1409919274-13419-3-git-send-email-svarbanov@mm-sol.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
Stanimir Varbanov schrieb, Am 05.09.2014 14:14: > Document DT binding for Qualcomm SPMI PMIC voltage ADC > driver. > > Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> > Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> > --- > .../devicetree/bindings/iio/adc/qcom,spmi-vadc.txt | 110 ++++++++++++++++++++ > 1 files changed, 110 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt > > diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt > new file mode 100644 > index 0000000..f9c780f > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt > @@ -0,0 +1,110 @@ > +Qualcomm's SPMI PMIC voltage ADC > + > +SPMI PMIC voltage ADC (VADC) provides interface to clients to read > +voltage. A 15 bit ADC is used for voltage measurements. There are multiple > +peripherals to the VADC and the scope of the driver is to provide interface > +for the USR peripheral of the VADC. > + > +VADC node: > + > +- compatible: > + Usage: required > + Value type: <string> > + Definition: Should contain "qcom,spmi-vadc". > + > +- reg: > + Usage: required > + Value type: <u32> > + Definition: Base address in the SPMI PMIC register map. > + > +- interrupts: > + Usage: required > + Value type: <prop-encoded-array> > + Definition: End of convertion interrupt number. Typo: conversion > + > +- qcom,poll-eoc: > + Usage: optional > + Value type: <empty> > + Definition: Use polling instead of interrupt for end of conversion > + completion. > + > +Channel node properities: Typo: properties > + > +- qcom,channel: > + Usage: required > + Value type: <u32> > + Definition: AMUX channel number. > + > +- qcom,decimation: > + Usage: optional > + Value type: <u32> > + Definition: Sampling rate to use for the individual channel measurement. > + Quicker measurements can be made by reducing decimation ratio. > + Valid values are 512, 1024, 2048, 4096. > + If property is not found, default value of 512 will be used. > + > +- qcom,pre-scaling: > + Usage: optional > + Value type: <u32 array> > + Definition: Used for scaling the channel input signal before the signal is > + fed to VADC. The configuration for this node is to know the > + pre-determined ratio and use it for post scaling. Select one from > + the following options. > + <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10> > + If property is not found default value depending of chip will be used. > + > +- qcom,ratiometric: > + Usage: optional > + Value type: <empty> > + Definition: Channel calibration type. If this property is specified > + VADC will use the VDD reference(1.8V) and GND for channel > + calibration. If properity is not found, channel will be Typo: property > + calibrated with 625mv and 1.25V reference channels. > + > +- qcom,hw-settle-time: > + Usage: optional > + Value type: <u32> > + Definition: Time between AMUX getting configured and the ADC starting > + conversion. Delay = 100us * (value) for value < 11, and > + 2ms * (value - 10) otherwise. > + Valid values are: 0, 100, 200, 300, 400, 500, 600, 700, 800, > + 900 us and 1, 2, 4, 6, 8, 10 ms > + If property is not found, channel will use 0us. > + > +- qcom,avg-samples: > + Usage: optional > + Value type: <u32> > + Definition: Number of samples to be used for measurement. > + Fast averaging provides the option to obtain a single measurement > + from the ADC that is an average of multiple samples. The value > + selected is 2^(value). > + Valid values are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 > + If property is not found, 1 sample will be used. > + > +- label: > + Usage: optional > + Value type: <string> > + Definition: Channel name used for sysfs entry. If not provided > + configuration device node name will be used. > + > +NOTE: At least one channel node is required. > + > +Example: > + /* VADC node */ > + vadc@3100 { > + compatible = "qcom,spmi-vadc"; > + reg = <0x3100>; > + interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>; > + #io-channel-cells = <1>; > + io-channel-ranges; > + > + /* Channel node */ > + usb_id_nopull@39 { > + qcom,channel = <VADC_LR_MUX10_USB_ID>; > + qcom,decimation = <512>; > + qcom,ratiometric; > + qcom,hw-settle-time = <200>; > + qcom,avg-samples = <1>; > + qcom,pre-scaling = <1 3> > + }; > + }; > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt new file mode 100644 index 0000000..f9c780f --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt @@ -0,0 +1,110 @@ +Qualcomm's SPMI PMIC voltage ADC + +SPMI PMIC voltage ADC (VADC) provides interface to clients to read +voltage. A 15 bit ADC is used for voltage measurements. There are multiple +peripherals to the VADC and the scope of the driver is to provide interface +for the USR peripheral of the VADC. + +VADC node: + +- compatible: + Usage: required + Value type: <string> + Definition: Should contain "qcom,spmi-vadc". + +- reg: + Usage: required + Value type: <u32> + Definition: Base address in the SPMI PMIC register map. + +- interrupts: + Usage: required + Value type: <prop-encoded-array> + Definition: End of convertion interrupt number. + +- qcom,poll-eoc: + Usage: optional + Value type: <empty> + Definition: Use polling instead of interrupt for end of conversion + completion. + +Channel node properities: + +- qcom,channel: + Usage: required + Value type: <u32> + Definition: AMUX channel number. + +- qcom,decimation: + Usage: optional + Value type: <u32> + Definition: Sampling rate to use for the individual channel measurement. + Quicker measurements can be made by reducing decimation ratio. + Valid values are 512, 1024, 2048, 4096. + If property is not found, default value of 512 will be used. + +- qcom,pre-scaling: + Usage: optional + Value type: <u32 array> + Definition: Used for scaling the channel input signal before the signal is + fed to VADC. The configuration for this node is to know the + pre-determined ratio and use it for post scaling. Select one from + the following options. + <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10> + If property is not found default value depending of chip will be used. + +- qcom,ratiometric: + Usage: optional + Value type: <empty> + Definition: Channel calibration type. If this property is specified + VADC will use the VDD reference(1.8V) and GND for channel + calibration. If properity is not found, channel will be + calibrated with 625mv and 1.25V reference channels. + +- qcom,hw-settle-time: + Usage: optional + Value type: <u32> + Definition: Time between AMUX getting configured and the ADC starting + conversion. Delay = 100us * (value) for value < 11, and + 2ms * (value - 10) otherwise. + Valid values are: 0, 100, 200, 300, 400, 500, 600, 700, 800, + 900 us and 1, 2, 4, 6, 8, 10 ms + If property is not found, channel will use 0us. + +- qcom,avg-samples: + Usage: optional + Value type: <u32> + Definition: Number of samples to be used for measurement. + Fast averaging provides the option to obtain a single measurement + from the ADC that is an average of multiple samples. The value + selected is 2^(value). + Valid values are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 + If property is not found, 1 sample will be used. + +- label: + Usage: optional + Value type: <string> + Definition: Channel name used for sysfs entry. If not provided + configuration device node name will be used. + +NOTE: At least one channel node is required. + +Example: + /* VADC node */ + vadc@3100 { + compatible = "qcom,spmi-vadc"; + reg = <0x3100>; + interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>; + #io-channel-cells = <1>; + io-channel-ranges; + + /* Channel node */ + usb_id_nopull@39 { + qcom,channel = <VADC_LR_MUX10_USB_ID>; + qcom,decimation = <512>; + qcom,ratiometric; + qcom,hw-settle-time = <200>; + qcom,avg-samples = <1>; + qcom,pre-scaling = <1 3> + }; + };