This question has been replayed several times in the six years I've been a member of this forum and the answer always depends on how much of a photo enthusiast you are and how much weight you're willing to carry. I consider myself a photo enthusiast (multiple Nikon DSLRs and a modest collection of lenses), so I know how hard it is to make the "should I" decision. The first question you should ask yourself is, "Is my goal to document my journey or is it to make a documentary about my journey." I know that sounds like two versions of the same question, but if you think about it, it's not.
On both of my Caminos, I opted to leave the DSLR, etc at home because I did not want photography to interfere with what, for me, was a spiritual pilgrimage -- but I did want to document my journey photographically in a way that supplemented or enhanced the journey without distracting me from my primary purpose. So on my first Camino I took a Canon SX compact camera with moderate zoom capabilities, and found it to be totally adequate for my purposes. On the second Camino I decided that even the compact Canon was more than I wanted to carry, so I took only my iPhone. While the iPhone took very nice photos, I missed the zoom capabilities and absolutely hated the lack of a viewfinder. However, I recall seeing a Camino blog by a professional photographer who used only an iPhone, and on the computer screen it was impossible to tell that it was a smartphone camera and not a multi-thousand dollar DSLR and pro-quality lenses. That just confirms that it's not the camera, but the eye of the photographer that creates outstanding images (plus a little post-processing know-how).
So I'm not going to say you should or should not take a DSLR, but if you do, take the smallest and lightest body you have or are willing to purchase, with no more than two lenses -- a medium range zoom for general shots and fast, wide prime for interiors of the amazing cathedrals along the way. Or maybe, as I have done in my more recent travels, opted for a micro four thirds body and a single do-it-all travel lens. In my case that is an Olympus OMD E_M5 and 14-150mm lens.
Good luck on your decision and Buen Camino.