linux-kernel - Re: [PATCH v3 1/5] bindings: regulator: added support for suspend states

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Message-ID: <20180119221108.nndgk3ln573n6zew@rob-hp-laptop>
Date:   Fri, 19 Jan 2018 16:11:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH v3 1/5] bindings: regulator: added support for suspend
 states

On Fri, Jan 12, 2018 at 06:18:21PM +0800, Chunyan Zhang wrote:
> Some systems need to set regulators to specific states when they enter
> low power modes, especially around CPUs. There are many of these modes
> depending on the particular runtime state.
> 
> Currently the regulator consumers are not granted permission to change
> suspend state of regulator devices, the constraints are configured at
> startup.  In order to allow changes in a vlotage range, we need to add
> new properties for voltage range and a flag to give permission to
> change the suspend voltage and suspend on/off in suspend mode.
> 
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
> ---
>  Documentation/devicetree/bindings/regulator/regulator.txt | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
> index 378f6dc..532e286 100644
> --- a/Documentation/devicetree/bindings/regulator/regulator.txt
> +++ b/Documentation/devicetree/bindings/regulator/regulator.txt
> @@ -42,8 +42,19 @@ Optional properties:
>  - regulator-state-[mem/disk] node has following common properties:
>  	- regulator-on-in-suspend: regulator should be on in suspend state.
>  	- regulator-off-in-suspend: regulator should be off in suspend state.
> -	- regulator-suspend-microvolt: regulator should be set to this voltage
> -	  in suspend.
> +	- regulator-suspend-min-microvolt: minimum voltage may be set in
> +	  suspend state.
> +	- regulator-suspend-max-microvolt: maximum voltage may be set in
> +	  suspend state.
> +	- regulator-suspend-microvolt: the default voltage which regulator
> +	  would be set in suspend. The voltage for suspend also can be
> +	  adjusted among {regulator-suspend-min-microvolt,
> +	  regulator-suspend-max-microvolt} by calling
> +	  regulator_set_suspend_voltage(). This property is now deprecated,
> +	  setting voltage for suspend mode via API the regulator driver
> +	  provides is recommended.

Please reword. This is Linux implementation details that shouldn't be in 
the binding.

> +	- regulator-changeable-in-suspend: whether the default voltage and
> +	  the regulator on/off in suspend can be changed in runtime.
>  	- regulator-mode: operating mode in the given suspend state.
>  	  The set of possible operating modes depends on the capabilities of
>  	  every hardware so the valid modes are documented on each regulator
> -- 
> 2.7.4
>