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Add a binding for the arm architected timer hardware's memory mapped interface. The mmio timer hardware is made up of one base frame and a collection of up to 8 timer frames, where each of the 8 timer frames can have either one or two views. A frame typically maps to a privilege level (user/kernel, hypervisor, secure). The first view has full access to the registers within a frame, while the second view can be restricted to particular registers within a frame. Each frame must support a physical timer. It's optional for a frame to support a virtual timer. Cc: devicetree-discuss@lists.ozlabs.org Cc: Marc Zyngier <Marc.Zyngier@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Rob Herring <robherring2@gmail.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com>