Hello Jean
thanks you so much for your time!
> This means they refer to left-aligned addresses. Linux uses
> right-aligned addresses, so your device lives at 0x20 as far as Linux
> is concerned.
effectively, after hours and hours of testing, I found by myself that
the correct addressed where 0x20 and 0x21 but was not able to
understand why the manufacturer gives me what I think was a wrong
registers map !
> Check arch/arm/mach-ks8695/board-acs5k.c and
> arch/arm/mach-pxa/cm-x300.c for examples.
I'll check these source in the next days... so pca953x driver could
just export his services to other modules ? does it nothing alone
and/or paired with gpiolib ? or it's just a question of give the
pca953x some platforms data ?
> (Assuming i2c-0 is the bus on which the chip actually lives - you can
> check with i2cdetect). That being said, I doubt that a GPIO chip can
> really be instantiated from user-space, as it needs configuration
> settings which you can't provide that way.
you are right... i've try yesterday with the correct addresses but
with no success.
thanks again...
Giampaolo
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