Eric Lee / smarc-fsl-linux-kernel

01 Oct, 2014

1 commit

  • bda003036   clk: add pxa clocks infrastructure ... Browse Code ยป

    Add a the common code used by all PXA variants.

    This is the first step in the transition from architecture defined
    clocks (in arch/arm/mach-pxa) towards clock framework. The goal is to
    have the same features (and not all the features) of the existing
    clocks, and enable the transition of PXA to device-tree.

    All PXA rely on a "CKEN" type clock, which :
    - has a gate (bit in CKEN register)
    - is generated from a PLL, generally divided
    - has an alternate low power clock

    Each variant will specialize the CKEN clock :
    - pxa25x have no low power clock
    - pxa27x in low power use always the 13 MHz ring oscillator
    - pxa3xx in low power have specific dividers for each clock

    The device-tree provides a list of CLK_* (ex: CLK_USB or CLK_I2C) to get
    a handle on the clock. While pxa-clock.h will describe all the clocks of
    all the variants, each variant will only use a subset of it.

    Signed-off-by: Robert Jarzmik
    Signed-off-by: Mike Turquette

    Robert Jarzmik