can: flexcan: implement can Runtime PM

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Flexcan will be disabled during suspend if no wakeup function required and
enabled after resume accordingly. During this period, we could explicitly
disable clocks.
Since PM is optional, the clock is enabled at probe to guarante the
clock is running when PM is not enabled in the kernel.

Implement Runtime PM which will:
1) Without CONFIG_PM, clock is running whether Flexcan up or down.
2) With CONFIG_PM, clock enabled while Flexcan up and disabled when
   Flexcan down.
3) Disable clock when do system suspend and enable clock while system
   resume.
4) Make Power Domain framework be able to shutdown the corresponding
   power domain of this device.

Signed-off-by: Aisheng Dong <aisheng.dong@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

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Aisheng Dong 2018-11-30 08:53:26 +00:00 • committed by Marc Kleine-Budde

parent 26bca9fe5f

commit ca10989632

1 changed files with 81 additions and 38 deletions

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119

drivers/net/can/flexcan.c

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