linux-kernel - Re: [PATCH v2 1/4] dt-bindings: mfd: bd9571mwv: Document DDR Backup Mode properties

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Date:   Sun, 18 Mar 2018 07:49:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: mfd: bd9571mwv: Document DDR Backup
 Mode properties

On Wed, Mar 14, 2018 at 12:08:39PM +0100, Geert Uytterhoeven wrote:
> Document the new optional properties related to DDR Backup Mode and
> toggle/momentary power switches.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2:
>   - Improve property description,
>   - Add properties for power switch type.
> ---
>  Documentation/devicetree/bindings/mfd/bd9571mwv.txt | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/bd9571mwv.txt b/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
> index 9ab216a851d5619b..8804a214759845c5 100644
> --- a/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
> +++ b/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
> @@ -25,6 +25,25 @@ Required properties:
>  			    Each child node is defined using the standard
>  			    binding for regulators.
>  
> +Optional properties:
> +  - rohm,ddr-backup-power : Value to use for DDR-Backup Power (default 0).
> +			    This is a bitmask that specifies which DDR power
> +			    rails need to be kept powered when backup mode is
> +			    entered, for system suspend:
> +			      - bit 0: DDR0
> +			      - bit 1: DDR1
> +			      - bit 2: DDR0C
> +			      - bit 3: DDR1C
> +			    These bits match the KEEPON_DDR* bits in the
> +			    documentation for the "BKUP Mode Cnt" register.
> +  - rohm,rstbmode-level: The RSTB signal is configured for level mode, to
> +			 accommodate a toggle power switch (the RSTBMODE pin is
> +			 strapped low).
> +  - rohm,rstbmode-pulse: The RSTB signal is configured for pulse mode, to
> +			 accommodate a momentary power switch (the RSTBMODE pin
> +			 is strapped high).
> +			 The two properties above are mutually exclusive.
> +
>  Example:
>  
>  	pmic: pmic@30 {
> @@ -36,6 +55,8 @@ Example:
>  		#interrupt-cells = <2>;
>  		gpio-controller;
>  		#gpio-cells = <2>;
> +		rohm,ddr-backup-power = <15>;

Would be better to use hex for a bit mask. Otherwise,

Reviewed-by: Rob Herring <robh@...nel.org>


> +		rohm,rstbmode-pulse;
>  
>  		regulators {
>  			dvfs: dvfs {
> -- 
> 2.7.4
>