"devoted passion" is a perfectly correct and usable phrase in written English.
You can use it to talk about a strong feeling of love or commitment towards someone or something. For example, "He has a devoted passion for poetry and has been writing since he was a child."
He devoted much passion and innovation to his successful career at United Sales Concepts for 25 years.
He was the former CEO of the Postgraduate Center for Mental Health in NYC to which he devoted his passion and commitment for more than 40 years.
Its characters are irresistibly given to breaking off from discussion of cosmic truths to devote equal passion to the taste of well-cooked salmon or Lydia's riveting confessions about her love life.
Hong Kong has seen a generation of young people devote energy, passion and sacrifice into a competing dream.
In what she recalls is her lifetime's defining moment, she knew she would subsequently devote her passion to the artistic profession.
The author, a psychology professor at Pacific University in Oregon who has also written books on Diane Arbus and Truman Capote, devotes equal passion to reporting the facts and deflating the myths of his subject's life.
Passion devoted to craftsmanship is no less real than passion devoted to human affairs.
She was a devoted wife whose passion for motherhood paralleled a life devoted to friendship and philanthropy.
Judging by the amount of space they devoted to the Passion story, even the writers of the Gospels were apparently more interested in those few days of Jesus' life than they were in anything else he had said or done.
"The Two Acolytes" describes the diverging paths of two young monks: one leaves the sacred mountain for a life devoted to earthly passion while the other remains faithful to his vows.
