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

[Jacek Anaszewski]

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@30000 {
     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.be...@nic.cz>
Cc: Rob Herring <robh...@kernel.org>
Cc: devicet...@vger.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