[PATCH v2 2/2] pxa/hx4700: Add Synaptics NavPoint (PXA27x SSP/SPI) driver

[Paul Parsons]

--- On Mon, 15/8/11, Eric Miao <eric.y.miao at gmail.com> wrote:
> > MFP_CFG_OUT(GPIO102, ...) had already moved from the
> patch v1 platform file to patch v2 mfp-pxa27x.h because it
> was suggested that MFP macros should not be used directly.
> > Changing the direction in the platform file would
> surely require using the MFP macros again, so how to keep
> everyone happy? Maybe I should just define a more generic
> name such as GPIO102_GPIO_OUT?
> 
> I guess we need a new definition for this config, looks
> like SCLK here
> is different from a normal configuration because the pxa27x
> is used
> as a SPI slave here?
> 
> And checked a bit with the pxa27x developer manual, there
> is no SCLK
> for this GPIO102????

GPIO102 is apparently a navpoint power enable; the old linux-2.6.21-hh20 kernel from handhelds.org defines it thus:

#define GPIO_NR_HX4700_SYNAPTICS_POWER_ON        102

I verified that it does need to be asserted before the navpoint will work. I don't possess any hx4700 developer documentation; perhaps Philipp can shed some light on GPIO102.