Eric Lee / smarc-uboot

02 Nov, 2015

1 commit

  • 5decbf530   dm: adc: add simple ADC uclass implementation ... Browse Code ยป

    This commit adds:
    - new uclass id: UCLASS_ADC
    - new uclass driver: drivers/adc/adc-uclass.c

    The new uclass's API allows for ADC operation on:
    * single-channel with channel selection by a number
    * multti-channel with channel selection by bit mask

    ADC uclass's functions:
    * single-channel:
    - adc_start_channel() - start channel conversion
    - adc_channel_data() - get conversion data
    - adc_channel_single_shot() - start/get conversion data
    * multi-channel:
    - adc_start_channels() - start selected channels conversion
    - adc_channels_data() - get conversion data
    - adc_channels_single_shot() - start/get conversion data for channels
    selected by bit mask
    * general:
    - adc_stop() - stop the conversion
    - adc_vdd_value() - positive reference Voltage value with polarity [uV]
    - adc_vss_value() - negative reference Voltage value with polarity [uV]
    - adc_data_mask() - conversion data bit mask

    The device tree can provide below constraints/properties:
    - vdd-polarity-negative: if true: Vdd = vdd-microvolts * (-1)
    - vss-polarity-negative: if true: Vss = vss-microvolts * (-1)
    - vdd-supply: phandle to Vdd regulator's node
    - vss-supply: phandle to Vss regulator's node
    And optional, checked only if the above corresponding, doesn't exist:
    - vdd-microvolts: positive reference Voltage [uV]
    - vss-microvolts: negative reference Voltage [uV]

    Signed-off-by: Przemyslaw Marczak
    Cc: Simon Glass
    Signed-off-by: Minkyu Kang

    Przemyslaw Marczak