linux-kernel - Re: [PATCHv4 2/2] dt-bindings: regulator: Add regulator suspend state for PM state

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Date:	Thu, 4 Sep 2014 23:53:03 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	lgirdwood@...il.com, grant.likely@...aro.org, robh+dt@...nel.org,
	kyungmin.park@...sung.com, k.kozlowski@...sung.com,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCHv4 2/2] dt-bindings: regulator: Add regulator suspend
 state for PM state

On Mon, Aug 18, 2014 at 03:27:03PM +0900, Chanwoo Choi wrote:

> +- regulator-initial-state: initial state for suspend state, cnd set initial
> +  state among following defined suspend states:
> +  <3>: PM_SUSPEND_MEM - Setup regulator according to regulator-state-mem
> +  <4>: PM_SUSPEND_MAX - Setup regulator according to regulator-state-disk

Please add defines for these in include/dt-bindings.  Probably worth
pointing out that if absent the state is the hardware default (same for
most of these.

> +- regulator-state-[mem/disk] node has following common properties:
> +	- regulator-volt: voltage consumers may set in suspend state.

We use -uV rather than -volt in other bits of the bindings.

> +	- regulator-on-in-suspend: regulator should be on in suspend state.
> +	- regulator-off-in-suspend: regulator should be off in suspend state.
> +	If node don't include regulator-[on/off]-in-suspend, can't change
> +	regulator state in suspend mode and only should sustain the regulator
> +	state of normal state.

Probably better to say that the OS will not manage the state here -
otherwise we have to explicitly override any hardware default that's
there which drivers and the core don't do right now.

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