tree 831b5211bea866700d9b5dfb3258a29b3de15cf3
parent 84cbb8db744c9bd690452e8f30ec1d83e65cf969
author Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1527263523 +0100
committer Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1536064583 +0100

imx: imx_snvs: Add an SNVS core functionality

This patch adds snvs.c with a imx_snvs_init() function.

imx_snvs_init() sets up permissions of the RTC via the SNVS HPCOMR.

During previous work with OPTEE on the i.MX7 part we discovered that prior
to switching from secure-world to normal-world it is required to apply more
permissive permissions than are defaulted to in order for Linux to be able
to access the RTC and CAAM functionality in general.

This patch pertains to fixing the RTC permissions by way of the
HPCOMR.NPSWA_EN bit.

Once set non-privileged code aka Linux-kernel code has permissions to
access the SNVS where the RTC resides.

Perform that permissions fix in imx_snvs_init() now, with a later patch making
the call from our platform setup code.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>