linux-kernel - Re: [PATCH v3 02/10] dt-bindings: serial: add optional pinctrl states

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Message-ID: <20190709143838.GA5665@bogus>
Date:   Tue, 9 Jul 2019 08:38:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Erwan Le Ray <erwan.leray@...com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Mark Rutland <mark.rutland@....com>,
        linux-serial@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Bich Hemon <bich.hemon@...com>
Subject: Re: [PATCH v3 02/10] dt-bindings: serial: add optional pinctrl states

On Thu, Jun 13, 2019 at 03:49:52PM +0200, Erwan Le Ray wrote:
> From: Bich Hemon <bich.hemon@...com>
> 
> Add options for pinctrl states:
> - "sleep" for low power
> - "idle" for low power and wakeup capabilities enabled
> - "no_console_suspend" for enabling console messages in low power
> 
> Signed-off-by: Bich Hemon <bich.hemon@...com>
> Signed-off-by: Erwan Le Ray <erwan.leray@...com>
> 
> diff --git a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
> index 5ec80c1..64a5ea9 100644
> --- a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
> +++ b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
> @@ -13,7 +13,14 @@ Required properties:
>  - clocks: The input clock of the USART instance
>  
>  Optional properties:
> -- pinctrl: The reference on the pins configuration
> +- pinctrl-names: Set to "default". An additional "sleep" state can be defined
> +  to set pins in sleep state when in low power. In case the device is used as
> +  a wakeup source, "idle" state is defined in order to keep RX pin active.
> +  For a console device, an optional state "no_console_suspend" can be defined
> +  to enable console messages during suspend. Typically, "no_console_suspend" and
> +  "default" states can refer to the same pin configuration.

no_console_suspend is a linux thing and doesn't belong in DT.

Rob