linux-kernel - Re: [PATCH 1/5] dt-bindings: reset: ocelot: Add documentation for 'microchip,reset-switch-core' property

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Message-ID: <20201118105945.GF4556@piout.net>
Date:   Wed, 18 Nov 2020 11:59:45 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>
Cc:     Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen.Hegelund@...rochip.com
Subject: Re: [PATCH 1/5] dt-bindings: reset: ocelot: Add documentation for
 'microchip,reset-switch-core' property

On 16/11/2020 18:11:55+0100, Gregory CLEMENT wrote:
> From: Lars Povlsen <lars.povlsen@...rochip.com>
> 
> This documents the 'microchip,reset-switch-core' property in the
> ocelot-reset driver.
> 
> Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
> ---
>  .../devicetree/bindings/power/reset/ocelot-reset.txt        | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> index 4d530d815484..20fff03753ad 100644
> --- a/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> +++ b/Documentation/devicetree/bindings/power/reset/ocelot-reset.txt
> @@ -9,9 +9,15 @@ microchip Sparx5 armv8 SoC's.
>  Required Properties:
>   - compatible: "mscc,ocelot-chip-reset" or "microchip,sparx5-chip-reset"
>  
> +Optional properties:
> +- microchip,reset-switch-core : Perform a switch core reset at the
> +  time of driver load. This is may be used to initialize the switch
> +  core to a known state (before other drivers are loaded).
> +

If this is to be used by the switchdev driver, then I would simply
register this reset as a proper reset controller (with the  driver/reset
API) and consume that from the switchdev driver.

However, the switch may also be configured from userspace in existing
products. In this case you'd have to expose a reset interface, either
from the drivers/reset core or with a specific consumer.

My point is that this property is not necessary.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com