This patch fixes off-by-one issues in the devicetree binding of
mxs-lradc.
According to the i.MX23 and i.MX28 reference manuals [1][2] the range of
NUM_SAMPLES is 0..31, but property ave-ctrl is substracted by 1 before used.
Considering all limitations the range of DELAY is 1..2047, but also
property ave-delay is substracted by 1 before used.
The patch has been suggested by Hartmut Knaack and Kristina Martsenko.
[1] - http://cache.freescale.com/files/dsp/doc/ref_manual/IMX23RM.pdf
[2] - http://cache.freescale.com/files/dsp/doc/ref_manual/MCIMX28RM.pdf
Signed-off-by: Stefan Wahren <redacted>
---
.../bindings/staging/iio/adc/mxs-lradc.txt | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
index ee05dc3..3075377 100644
--- a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
+++ b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
@@ -12,9 +12,9 @@ Optional properties:
property is not present, then the touchscreen is
disabled. 5 wires is valid for i.MX28 SoC only.
- fsl,ave-ctrl: number of samples per direction to calculate an average value.
- Allowed value is 1 ... 31, default is 4
+ Allowed value is 1 ... 32, default is 4
- fsl,ave-delay: delay between consecutive samples. Allowed value is
- 1 ... 2047. It is used if 'fsl,ave-ctrl' > 1, counts at
+ 2 ... 2048. It is used if 'fsl,ave-ctrl' > 1, counts at
2 kHz and its default is 2 (= 1 ms)
- fsl,settling: delay between plate switch to next sample. Allowed value is
1 ... 2047. It counts at 2 kHz and its default is--
1.7.9.5