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iio: adc: axp20x_adc: add support for AXP813 ADC

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The X-Powers AXP813 PMIC is really close to what is already done for
AXP20X/AXP22X.

There are two pairs of bits to set the rate (one for Voltage and Current
measurements and one for TS/GPIO0 voltage measurements) instead of one.

The register to set the ADC rates is different from the one for
AXP20X/AXP22X.

GPIO0 can be used as an ADC (measuring Volts) unlike for AXP22X.

The scales to apply to the different inputs are unlike the ones from
AXP20X and AXP22X.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Quentin Schulz
2018-01-15 11:33:41 +01:00
committed by Jonathan Cameron
parent 359163d786
commit 1a3f675564
2 changed files with 125 additions and 0 deletions
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2
include/linux/mfd/axp20x.h
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@@ -266,6 +266,8 @@ enum axp20x_variants {
#define AXP288_RT_BATT_V_H 0xa0
#define AXP288_RT_BATT_V_L 0xa1
#define AXP813_ADC_RATE 0x85
/* Fuel Gauge */
#define AXP288_FG_RDC1_REG 0xba
#define AXP288_FG_RDC0_REG 0xbb