tty: serial: lpuart: add imx7ulp support
authorDong Aisheng <aisheng.dong@nxp.com>
Tue, 13 Jun 2017 02:55:52 +0000 (10:55 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 29 Jun 2017 15:12:34 +0000 (17:12 +0200)
commit24b1e5f0e83c2aced8096473d20c4cf6c1355f30
treed2e12a752f6d06393830f6ad44facecb511e5187
parentf2422fe43790204b98d3de823c332477b38242f7
tty: serial: lpuart: add imx7ulp support

The lpuart of imx7ulp is basically the same as ls1021a. It's also
32 bit width register, but unlike ls1021a, it's little endian.
Besides that, imx7ulp lpuart has a minor different register layout
from ls1021a that it has four extra registers (verid, param, global,
pincfg) located at the beginning of register map, which are currently
not used by the driver and less to be used later.

To ease the register difference handling, we add a reg_off member
in lpuart_soc_data structure to represent if the normal
lpuart32_{read|write} requires plus a offset to hide the issue.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Mingkai Hu <Mingkai.Hu@nxp.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Cc: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/fsl_lpuart.c