linux-kernel - Re: [PATCH v2 6/7] dt-bindings: net: realtek: Add property to configure LED mode

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Message-ID: <e8fe7baf-e4e0-c713-7b93-07a3859c33c6@gmail.com>
Date:   Wed, 3 Jul 2019 14:37:47 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 6/7] dt-bindings: net: realtek: Add property to
 configure LED mode

On 7/3/19 12:37 PM, Matthias Kaehlcke wrote:
> The LED behavior of some Realtek PHYs is configurable. Add the
> property 'realtek,led-modes' to specify the configuration of the
> LEDs.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - patch added to the series
> ---
>  .../devicetree/bindings/net/realtek.txt         |  9 +++++++++
>  include/dt-bindings/net/realtek.h               | 17 +++++++++++++++++
>  2 files changed, 26 insertions(+)
>  create mode 100644 include/dt-bindings/net/realtek.h
> 
> diff --git a/Documentation/devicetree/bindings/net/realtek.txt b/Documentation/devicetree/bindings/net/realtek.txt
> index 71d386c78269..40b0d6f9ee21 100644
> --- a/Documentation/devicetree/bindings/net/realtek.txt
> +++ b/Documentation/devicetree/bindings/net/realtek.txt
> @@ -9,6 +9,12 @@ Optional properties:
>  
>  	SSC is only available on some Realtek PHYs (e.g. RTL8211E).
>  
> +- realtek,led-modes: LED mode configuration.
> +
> +	A 0..3 element vector, with each element configuring the operating
> +	mode of an LED. Omitted LEDs are turned off. Allowed values are
> +	defined in "include/dt-bindings/net/realtek.h".

This should probably be made more general and we should define LED modes
that makes sense regardless of the PHY device, introduce a set of
generic functions for validating and then add new function pointer for
setting the LED configuration to the PHY driver. This would allow to be
more future proof where each PHY driver could expose standard LEDs class
devices to user-space, and it would also allow facilities like: ethtool
-p to plug into that.

Right now, each driver invents its own way of configuring LEDs, that
does not scale, and there is not really a good reason for that other
than reviewing drivers in isolation and therefore making it harder to
extract the commonality. Yes, I realize that since you are the latest
person submitting something in that area, you are being selected :)

> +
>  Example:
>  
>  mdio0 {
> @@ -20,5 +26,8 @@ mdio0 {
>  		reg = <1>;
>  		realtek,eee-led-mode-disable;
>  		realtek,enable-ssc;
> +		realtek,led-modes = <RTL8211E_LINK_ACTIVITY
> +				     RTL8211E_LINK_100
> +				     RTL8211E_LINK_1000>;
>  	};
>  };
> diff --git a/include/dt-bindings/net/realtek.h b/include/dt-bindings/net/realtek.h
> new file mode 100644
> index 000000000000..8d64f58d58f8
> --- /dev/null
> +++ b/include/dt-bindings/net/realtek.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _DT_BINDINGS_REALTEK_H
> +#define _DT_BINDINGS_REALTEK_H
> +
> +/* LED modes for RTL8211E PHY */
> +
> +#define RTL8211E_LINK_10		1
> +#define RTL8211E_LINK_100		2
> +#define RTL8211E_LINK_1000		4
> +#define RTL8211E_LINK_10_100		3
> +#define RTL8211E_LINK_10_1000		5
> +#define RTL8211E_LINK_100_1000		6
> +#define RTL8211E_LINK_10_100_1000	7
> +
> +#define RTL8211E_LINK_ACTIVITY		(1 << 16)
> +
> +#endif
> 


-- 
Florian