irqchip/imx-intmux: Implement intmux runtime power management

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When the system is suspended, we can explicitly disable clock to save
power. To achieve this, we need save registers' state since it could be
lost after power off.

Implement power management which will:
- Turn the clock off after probing
- Disable clock and save registers' state on system suspend, as
  well as enable clock and restore registers' state on resume
- Rely on the Power Domain framework to shutdown the intmux
  power domain

Without CONFIG_PM, the clock is always on after probe stage.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
[maz: revamped commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200727141734.24890-2-qiangqing.zhang@nxp.com

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Joakim Zhang 2020-07-27 22:17:34 +08:00 • committed by Marc Zyngier

parent d1bd7e0ba5

commit bb403111e0

1 changed files with 65 additions and 2 deletions

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drivers/irqchip/irq-imx-intmux.c

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