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Date: Fri, 5 Jun 2015 14:56:50 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Thomas Betker <thomas.betker@...de-schwarz.com>, Jonathan Cameron <jic23@...nel.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.16.y-ckt 007/110] iio: adc: xilinx: Fix VREFN sign 3.16.7-ckt13 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Betker <thomas.betker@...de-schwarz.com> commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 upstream. The VREFN channel is bipolar, not unipolar. Small negative values do occur (e.g., -1mV), and unsigned conversion maps them incorrectly to large positive values (about +1V), so fix this. Signed-off-by: Thomas Betker <thomas.betker@...de-schwarz.com> Signed-off-by: Jonathan Cameron <jic23@...nel.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- drivers/iio/adc/xilinx-xadc-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c index 4976aed06344..c7637716fa8f 100644 --- a/drivers/iio/adc/xilinx-xadc-core.c +++ b/drivers/iio/adc/xilinx-xadc-core.c @@ -997,7 +997,7 @@ static const struct iio_event_spec xadc_voltage_events[] = { .num_event_specs = (_alarm) ? ARRAY_SIZE(xadc_voltage_events) : 0, \ .scan_index = (_scan_index), \ .scan_type = { \ - .sign = 'u', \ + .sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \ .realbits = 12, \ .storagebits = 16, \ .shift = 4, \ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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