• Wolfram Sang's avatar
    lib: add support for stmp-style devices · 4ccf4bea
    Wolfram Sang authored
    MX23/28 use IP cores which follow a register layout I have first seen on
    STMP3xxx SoCs. In this layout, every register actually has four u32:
     1.) to store a value directly
     2.) a SET register where every 1-bit sets the corresponding bit,
         others are unaffected
     3.) same with a CLR register
     4.) same with a TOG (toggle) register
    Also, the 2 MSBs in register 0 are always the same and can be used to reset
    the IP core.
    All this is strictly speaking not mach-specific (but IP core specific) and,
    thus, doesn't need to be in mach-mxs/include. At least mx6 also uses IP cores
    following this stmp-style. So:
    Introduce a stmp-style device, put the code and defines for that in a public
    place (lib/), and let drivers for stmp-style devices select that code.
    To avoid regressions and ease reviewing, the actual code is simply copied from
    mach-mxs. It definately wants updates, but those need a seperate patch series.
    Voila, mach dependency gone, reusable code introduced. Note that I didn't
    remove the duplicated code from mach-mxs yet, first the drivers have to be
    Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
    Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
    Acked-by: default avatarDong Aisheng <dong.aisheng@linaro.org>
stmp_device.c 2.08 KB