From c68013f3a9a7c901a9a7935a973a0ab1cc884c4a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Stefan=20Br=C3=BCns?= Date: Fri, 8 Dec 2017 18:41:48 +0100 Subject: iio: adc: ina2xx: Remove unneeded dummy read to clear CNVR flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Although the datasheet states the CNVR flag is cleared by reading the BUS_VOLTAGE register, it is actually cleared by reading any of the voltage/current/power registers. The behaviour has been confirmed by TI support: http://e2e.ti.com/support/amplifiers/current-shunt-monitors/f/931/p/647053/2378282 Signed-off-by: Stefan Brüns Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/ina2xx-adc.c | 14 -------------- 1 file changed, 14 deletions(-) (limited to 'drivers/iio') diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c index 8c8120406f52..b027d485398b 100644 --- a/drivers/iio/adc/ina2xx-adc.c +++ b/drivers/iio/adc/ina2xx-adc.c @@ -705,7 +705,6 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev) int bit, ret, i = 0; s64 time_a, time_b; unsigned int alert; - int cnvr_need_clear = 0; time_a = iio_get_time_ns(indio_dev); @@ -730,7 +729,6 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev) ret = regmap_read(chip->regmap, INA2XX_BUS_VOLTAGE, &alert); alert &= INA219_CNVR; - cnvr_need_clear = alert; } if (ret < 0) @@ -752,18 +750,6 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev) return ret; data[i++] = val; - - if (INA2XX_SHUNT_VOLTAGE + bit == INA2XX_POWER) - cnvr_need_clear = 0; - } - - /* Dummy read on INA219 power register to clear CNVR flag */ - if (cnvr_need_clear && chip->config->chip_id == ina219) { - unsigned int val; - - ret = regmap_read(chip->regmap, INA2XX_POWER, &val); - if (ret < 0) - return ret; } time_b = iio_get_time_ns(indio_dev); -- cgit v1.2.3