  We present a preliminary study of the pion, kaon and D-meson masses and decay
constants in isosymmetric QCD, as well as a preliminary result for the
light-quark renormalized mass. The analysis is based on the gauge ensembles
produced by ETMC with $N_f=2+1+1$ flavours of Wilson-clover twisted mass
quarks, spanning a range of lattice spacings from $\sim0.10$ to $0.07$ fm and
include configurations at the physical pion point on lattices with linear size
up to $L~\sim~5.6$~fm
