imxpcie_decompose_tag
pc->pc_decompose_tag = imxpcie_decompose_tag;
imxpcie_decompose_tag(v, tag, &b, &d, &f);
imxpcie_decompose_tag(v, tag, &b, &d, &f);
static void imxpcie_decompose_tag(void *, pcitag_t, int *, int *, int *);