• Russell King's avatar
    ARM: dove: create a proper PMU driver for power domains, PMU IRQs and resets · 44e259ac
    Russell King authored
    The PMU device contains an interrupt controller, power control and
    resets.  The interrupt controller is a little sub-standard in that
    there is no race free way to clear down pending interrupts, so we try
    to avoid problems by reducing the window as much as possible, and
    clearing as infrequently as possible.
    
    The interrupt support is implemented using an IRQ domain, and the
    parent interrupt referenced in the standard DT way.
    
    The power domains and reset support is closely related - there is a
    defined sequence for powering down a domain which is tightly coupled
    with asserting the reset.  Hence, it makes sense to group these two
    together, and in order to avoid any locking contention disrupting this
    sequence, we avoid the use of syscon or regmap.
    
    This patch adds the core PMU driver: power domains must be defined in
    the DT file in order to make use of them.  The reset controller can
    be referenced in the standard way for reset controllers.
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
    Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
    44e259ac
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