[PATCH v2 3/6] imx8: add rom api wrappers

[sbabic at denx.de]

> The ROM API is thoroughly undocumented, but apparently passing the xor
> of the real arguments as an extra argument is required [1]. Also, we
> need to do the "save gd/restore gd" dance. These are both error-prone,
> and lead to a lot of code duplication.
> Since both imx8m[np] and imx8ulp SOCs have this, add a separate
> translation unit which is included precisely when the new
> CONFIG_IMX8_ROMAPI symbol is set, which provide convenience wrappers
> that take care of computing the xor value as well as doing the gd
> dance, and that thus have a more intuitive API. Subsequent patches
> will make use of these to reduce boilerplate.
> [1] One wonders, for example, if the check is only applied to the
> lower 32 bits, or if we're implicitly relying on all 64-bit pointer
> values we're passing effectively have 0 in the upper 32 bits.
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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