Re: [PATCH] can: flexcan: Implement CAN Runtime PM

[Marc Kleine-Budde]

On 10/19/18 11:45 AM, Joakim Zhang wrote:
> From: Dong Aisheng <aisheng.dong@xxxxxxx>
> 
> Flexcan will be disabled during suspend if no wakeup function required
> and enabled after resume accordingly. During this period, we could
> explicitly disable clocks.
> 
> Implement Runtime PM which will:
> 1) Keep device in suspend state (clocks disabled) if it's not openned
> 2) Make Power Domain framework be able to shutdown the corresponding power
> domain of this device.

Without CONFIG_PM the device fails to probe:

> [  214.420606] flexcan 2090000.flexcan: 2090000.flexcan supply xceiver not found, using dummy regulator
> [  214.445952] flexcan 2090000.flexcan: Linked as a consumer to regulator.0
> [  214.453448] flexcan 2090000.flexcan: registering netdev failed
> [  214.459666] flexcan 2090000.flexcan: Dropping the link to regulator.0
> [  214.472066] flexcan: probe of 2090000.flexcan failed with error -110

Marc

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