linux-kernel - Re: [PATCH leds + devicetree v2 2/2] leds: trigger: netdev: parse `trigger-sources` from device tree

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Date:   Tue, 15 Sep 2020 23:35:25 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Marek Behún <marek.behun@....cz>,
        linux-leds@...r.kernel.org
Cc:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH leds + devicetree v2 2/2] leds: trigger: netdev: parse
 `trigger-sources` from device tree

Hi Marek,

On 9/15/20 5:26 PM, Marek Behún wrote:
> Allow setting netdev LED trigger as default when given LED DT node has
> the `trigger-sources` property pointing to a node corresponding to a
> network device.
> 
> The specific netdev trigger mode is determined from the `function` LED
> property.
> 
> Example:
>    eth0: ethernet@...00 {
>      compatible = "xyz";
>      #trigger-source-cells = <0>;
>    };
> 
>    led {
>      color = <LED_COLOR_ID_GREEN>;
>      function = LED_FUNCTION_LINK;
>      trigger-sources = <&eth0>;
>    };
> 
> Signed-off-by: Marek Behún <marek.behun@....cz>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> ---
>   drivers/leds/trigger/ledtrig-netdev.c | 80 ++++++++++++++++++++++++++-
>   include/dt-bindings/leds/common.h     |  1 +
>   2 files changed, 80 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
> index d5e774d830215..99fc2f0c68e12 100644
> --- a/drivers/leds/trigger/ledtrig-netdev.c
> +++ b/drivers/leds/trigger/ledtrig-netdev.c
> @@ -20,6 +20,7 @@
[...]

>   static int netdev_trig_activate(struct led_classdev *led_cdev)
>   {
>   	struct led_netdev_data *trigger_data;
> @@ -414,10 +479,17 @@ static int netdev_trig_activate(struct led_classdev *led_cdev)
>   	trigger_data->last_activity = 0;
>   
>   	led_set_trigger_data(led_cdev, trigger_data);
> +	netdev_trig_of_parse(led_cdev, trigger_data);

Please be aware of LED_INIT_DEFAULT_TRIGGER flag - it would make
sense to use it here so as not to unnecessarily call
netdev_trig_of_parse(), which makes sense only if trigger will be
default, I presume.

See timer_trig_activate() in  drivers/leds/trigger/ledtrig-timer.c
for reference.

-- 
Best regards,
Jacek Anaszewski