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8614206a05
New driver adding support for ADC found on Cirrus Logic EP93xx series of SoCs. Board specific code must take care to create plaform device with all necessary resources. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
30 lines
1.0 KiB
Plaintext
30 lines
1.0 KiB
Plaintext
Cirrus Logic EP93xx ADC driver.
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1. Overview
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The driver is intended to work on both low-end (EP9301, EP9302) devices with
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5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel
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touchscreen/ADC module.
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2. Channel numbering
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Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets.
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EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is
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not defined. So the last three are numbered randomly, let's say.
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Assuming ep93xx_adc is IIO device0, you'd find the following entries under
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/sys/bus/iio/devices/iio:device0/:
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+-----------------+---------------+
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| sysfs entry | ball/pin name |
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+-----------------+---------------+
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| in_voltage0_raw | YM |
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| in_voltage1_raw | SXP |
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| in_voltage2_raw | SXM |
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| in_voltage3_raw | SYP |
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| in_voltage4_raw | SYM |
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| in_voltage5_raw | XP |
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| in_voltage6_raw | XM |
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| in_voltage7_raw | YP |
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+-----------------+---------------+
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