[LinuxPPS] gpio-pps with echopin

[f.hiesinger]

 Hi Folks,
 thanks for your comments. Attached the refactored version.

 1) @Jan: You suggested a new property "echo-gpios", which can be 
 checked by the driver. I tried to implement but struggled with 
 GPIO-request-function "of_get_gpio(...)" because its looks for a 
 property called "gpios" (see 
 http://lxr.free-electrons.com/source/include/linux/of_gpio.h#L122). A 
 change of of_gpio.h seems a bit too costly to me. As a workaround I 
 implemented an additional property "echo-enable", which also removes the 
 disliked #ifdefs. Any suggestions/comments for this?

 2) I want to make polarity of echopin configurable. Is there a more 
 elegant way than via Device-Node properties?

 Regards,
 Frank
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