Add support for Linear Technology LTC2632 (SPI) family of·
dual 12- 10-, and 8-bits output DACs.
Signed-off-by: NMaxime Roussin-Belanger <maxime.roussinbelanger@gmail.com>
Signed-off-by: NJean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>