linux-kernel - Re: [PATCH 1/2] dt-bindings: wkup-m3-ipc: Add ti,scale-data-fw property

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Date:   Mon, 25 Apr 2022 11:22:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Drew Fustini <dfustini@...libre.com>
Cc:     Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Dave Gerlach <d-gerlach@...com>,
        Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Keerthy <j-keerthy@...com>
Subject: Re: [PATCH 1/2] dt-bindings: wkup-m3-ipc: Add ti,scale-data-fw
 property

On Sun, Apr 24, 2022 at 10:28:05PM -0700, Drew Fustini wrote:
> From: Dave Gerlach <d-gerlach@...com>
> 
> Add documentation for ti,scale-data-fw property to enable I2C PMIC
> voltage scaling during deep sleep. The property contains the name of a
> binary file for the CM3 firmware to load.
> 
> Based on previous work by Russ Dill.
> 
> Signed-off-by: Dave Gerlach <d-gerlach@...com>
> Signed-off-by: Keerthy <j-keerthy@...com>
> [dfustini: split from driver patch and convert to json-schema]
> Signed-off-by: Drew Fustini <dfustini@...libre.com>
> ---
>  .../devicetree/bindings/soc/ti/wkup-m3-ipc.yaml       | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
> index 88d690de050c..d2c248d82384 100644
> --- a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
> +++ b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
> @@ -40,6 +40,12 @@ description: |+
>    override the pin's existing bias (pull-up/pull-down) and value (high/low) when
>    IO isolation is active.
>  
> +  Support for I2C PMIC Voltage Scaling
> +  ====================================
> +  It is possible to pass the name of a binary file to load into the CM3 memory.
> +  The binary data is the I2C sequences for the CM3 to send out to the PMIC
> +  during low power mode entry.
> +
>  properties:
>    compatible:
>      enum:
> @@ -67,6 +73,11 @@ properties:
>        mbox_wkupm3 child node.
>      maxItems: 1
>  
> +  ti,scale-data-fw:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description:
> +      Name of the firmware binary in /lib/firmware to copy to CM3 aux data

The location of firmware files is up to the OS.

Is there other firmware? If not, 'firmware-name' is the somewhat 
standard property for this.

What's the default name?

> +
>    ti,vtt-gpio-pin:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description: GPIO pin connected to enable pin on VTT regulator
> -- 
> 2.32.0
> 
>