tree e6f3105e9618281f3e5be1ebda19c0a987a0bc1e
parent 2cee321f0010a877ab8ffe1f3bf0ff55bf3984c9
author Leonard Crestez <leonard.crestez@nxp.com> 1557482861 +0300
committer Leonard Crestez <leonard.crestez@nxp.com> 1558340694 +0300

plat: imx8mq: Implement IMX_SIP_GET_SOC_INFO

The manual documents that 0x3036006c should contains the soc revision
for imx8mq but this always reports A0. Work around this by parsing the
ROM header and checking if OCOTP register 0x40 is stuck at 0xff0055aa.

Determining this inside TF-A makes life easier for OS, see for example
this linux discussion: https://lkml.org/lkml/2019/5/3/465

The soc revision can also be useful inside TF-A itself, for example for
the non-upstream DDR DVFS "busfreq" feature is affected by 8mq erratas.

The clock for OCOTP block can be disabled by OS so only initialize soc
revision once at boot time.

Change-Id: I9ca3f27840229ce8a28b53870e44da29f63c73aa
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>