Yes, in the sense that (a) all MIPI members are obligated to license essential patent claims to other MIPI members on a royalty-free basis, and (b) MIPI itself does not charge royalties.
The royalty free license obligation is subject to important definitions, limitations and caveats, described and defined in the Membership Agreement. MIPI Alliance encourages all parties to carefully review the Membership Agreement.
The license obligations of the MIPI Membership Agreement apply only to those parties that have agreed to its terms. MIPI Alliance cannot and does not evaluate whether third parties control essential patent claims, and accordingly cannot guarantee that specification implementations are in fact free from patent-related claims.