linux-kernel - Re: [PATCH v2 1/3] dt-bindings: leds: common: Drop enumeration for linux,default-triggers

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Date:   Mon, 11 May 2020 18:12:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: leds: common: Drop enumeration for
 linux,default-triggers

On Mon, Apr 27, 2020 at 03:31:30PM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
> 
> The bindings currently list a very small subset of valid triggers for
> LEDs. Since many drivers or subsystems in Linux register custom
> triggers, the list would become very hard to maintain.

The idea was we'll consolidate around standardized names and that new 
users should use 'function' instead.

There was discussion around this when adding 'function'.

> 
> Instead, just drop the list and allow free form strings.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  .../devicetree/bindings/leds/common.yaml      | 21 +------------------
>  1 file changed, 1 insertion(+), 20 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml
> index 4c270fde4567..3b3cdab3fc15 100644
> --- a/Documentation/devicetree/bindings/leds/common.yaml
> +++ b/Documentation/devicetree/bindings/leds/common.yaml
> @@ -79,26 +79,7 @@ properties:
>      description:
>        This parameter, if present, is a string defining the trigger assigned to
>        the LED.
> -    allOf:
> -      - $ref: /schemas/types.yaml#definitions/string
> -    enum:
> -        # LED will act as a back-light, controlled by the framebuffer system
> -      - backlight
> -        # LED will turn on (but for leds-gpio see "default-state" property in
> -        # Documentation/devicetree/bindings/leds/leds-gpio.yaml)
> -      - default-on
> -        # LED "double" flashes at a load average based rate
> -      - heartbeat
> -        # LED indicates disk activity
> -      - disk-activity
> -        # LED indicates IDE disk activity (deprecated), in new implementations
> -        # use "disk-activity"
> -      - ide-disk
> -        # LED flashes at a fixed, configurable rate
> -      - timer
> -        # LED alters the brightness for the specified duration with one software
> -        # timer (requires "led-pattern" property)
> -      - pattern
> +    $ref: /schemas/types.yaml#definitions/string
>  
>    led-pattern:
>      description: |
> -- 
> 2.26.0
>