• Gerhard Sittig's avatar
    clk: mpc5xxx: switch to COMMON_CLK, retire PPC_CLOCK · 7d71d5b2
    Gerhard Sittig authored
    the setup before the change was
    - arch/powerpc/Kconfig had the PPC_CLOCK option, off by default
    - depending on the PPC_CLOCK option the arch/powerpc/kernel/clock.c file
      was built, which implements the clk.h API but always returns -ENOSYS
      unless a platform registers specific callbacks
    - the MPC52xx platform selected PPC_CLOCK but did not register any
      callbacks, thus all clk.h API calls keep resulting in -ENOSYS errors
      (which is OK, all peripheral drivers deal with the situation)
    - the MPC512x platform selected PPC_CLOCK and registered specific
      callbacks implemented in arch/powerpc/platforms/512x/clock.c, thus
      provided real support for the clock API
    - no other powerpc platform did select PPC_CLOCK
    
    the situation after the change is
    - the MPC512x platform implements the COMMON_CLK interface, and thus the
      PPC_CLOCK approach in arch/powerpc/platforms/512x/clock.c has become
      obsolete
    - the MPC52xx platform still lacks genuine support for the clk.h API
      while this is not a change against the previous situation (the error
      code returned from COMMON_CLK stubs differs but every call still
      results in an error)
    - with all references gone, the arch/powerpc/kernel/clock.c wrapper and
      the PPC_CLOCK option have become obsolete, as did the clk_interface.h
      header file
    
    the switch from PPC_CLOCK to COMMON_CLK is done for all platforms within
    the same commit such that multiplatform kernels (the combination of 512x
    and 52xx within one executable) keep working
    
    Cc: Mike Turquette <mturquette@linaro.org>
    Cc: Anatolij Gustschin <agust@denx.de>
    Cc: linux-arm-kernel@lists.infradead.org
    Cc: linuxppc-dev@lists.ozlabs.org
    Signed-off-by: default avatarGerhard Sittig <gsi@denx.de>
    Signed-off-by: default avatarAnatolij Gustschin <agust@denx.de>
    7d71d5b2
Kconfig 1.68 KB