On 03-12-13 13:21, Sebastian Reichel wrote:
Hi,
The lis302 has already a DT binding described in [0],
which descibes misc. hardware properties. The problem
is, that the Nokia N900 needs negative values for some
of the properties, which seem to be unsupported by DT.
The following values would be needed for the N900 (taken
from board code):
st,axis-x = <1>; /* LIS3_DEV_X */
st,axis-y = <-2>; /* LIS3_INV_DEV_Y */
st,axis-z = <-3>; /* LIS3_INV_DEV_Z */
st,min-limit-x = <-32>;
st,min-limit-y = <3>;
st,min-limit-z = <3>;
st,max-limit-x = <-3>;
st,max-limit-y = <32>;
st,max-limit-z = <32>;
Can you please tell me how to setup the properties correctly?
Hi Sebastian,
The code to support inversion of the axis is there... but apparently
only in the I2C code. It seems the SPI code doesn't (yet) use any of
these values. Is the accelerometer on the N900 connected via SPI, by
chance?
It should be pretty simple to extend the SPI driver to support axis
conversion too. It'd basically be a copy-paste of lis3lv02d_i2c_probe()
Concerning {min,max}-limit-*, I only have vague understanding of this
information (only used in self test), but it should already be working
fine with both I2C and SPI (as it's bus independent). In addition, note
that it's compared to raw data (i.e., before axis conversion), so you
probably don't need to put negative values there.
Éric
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