drm/etnaviv: add initial etnaviv DRM driver

[Dan Carpenter]

Hello The etnaviv authors,

The patch a8c21a5451d8: "drm/etnaviv: add initial etnaviv DRM driver"
from Dec 3, 2015, leads to the following static checker warning:

	drivers/gpu/drm/etnaviv/etnaviv_gpu.c:254 etnaviv_hw_identify()
	warn: masked condition '(((chipIdentity) << 24) & 4278190080) == 1' is always false.

drivers/gpu/drm/etnaviv/etnaviv_gpu.c
   247  static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
   248  {
   249          u32 chipIdentity;
   250  
   251          chipIdentity = gpu_read(gpu, VIVS_HI_CHIP_IDENTITY);
   252  
   253          /* Special case for older graphic cores. */
   254          if (VIVS_HI_CHIP_IDENTITY_FAMILY(chipIdentity) ==  0x01) {
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Not possibly true.

   255                  gpu->identity.model    = 0x500; /* gc500 */
   256                  gpu->identity.revision = VIVS_HI_CHIP_IDENTITY_REVISION(chipIdentity);
   257          } else {
   258  

regards,
dan carpenter