This patch adds support for the ES581.4 interface from ETAS
GmbH (https://www.etas.com/en/products/es58x.php).

Link: https://lore.kernel.org/r/20210410095948.233305-3-mailhol.vincent@wanadoo.frCo-developed-by: NArunachalam Santhanam <arunachalam.santhanam@in.bosch.com>
Signed-off-by: NArunachalam Santhanam <arunachalam.santhanam@in.bosch.com>
Signed-off-by: NVincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>