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SubjectRe: [PATCH 4/4] leds: trigger: Add pattern initialization from Device Tree
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Hi Krzysztof,

Thank you for the patch set.

Applied 1/4 and 2/4.

I'll hold on merging 3/4 until we sort out the issues
I have with this one. Please refer to my comment below.

On 12/7/18 1:32 PM, Krzysztof Kozlowski wrote:
> Allow initialization of pattern used in pattern trigger from Device Tree
> property.
>
> This is especially useful for embedded systems where the pattern trigger
> would be used to indicate the process of boot status in a nice,
> user-friendly blinking way. This initialization pattern will be used
> till user-space is brought up and sets its own pattern, indicating the
> boot status is for example finished.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
> drivers/leds/trigger/ledtrig-pattern.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
> index 1870cf87afe1..96309d3bc43c 100644
> --- a/drivers/leds/trigger/ledtrig-pattern.c
> +++ b/drivers/leds/trigger/ledtrig-pattern.c
> @@ -11,6 +11,7 @@
> #include <linux/leds.h>
> #include <linux/module.h>
> #include <linux/mutex.h>
> +#include <linux/of.h>
> #include <linux/slab.h>
> #include <linux/timer.h>
>
> @@ -331,6 +332,21 @@ static const struct attribute_group *pattern_trig_groups[] = {
> NULL,
> };
>
> +static void pattern_init(struct led_classdev *led_cdev)
> +{
> + struct device_node *np = dev_of_node(led_cdev->dev);
> + const char *pattern;
> +
> + if (!np)
> + return;
> +
> + if (!of_property_read_string(np, "linux,trigger-pattern", &pattern)) {
> + if (strlen(pattern))
> + pattern_trig_store_patterns(led_cdev, pattern,
> + strlen(pattern), false);
> + }
> +}
> +
> static int pattern_trig_activate(struct led_classdev *led_cdev)
> {
> struct pattern_trig_data *data;
> @@ -354,6 +370,8 @@ static int pattern_trig_activate(struct led_classdev *led_cdev)
> timer_setup(&data->timer, pattern_trig_timer_function, 0);
> led_cdev->activated = true;
>
> + pattern_init(led_cdev);

It means that the pattern defined in DT would be applied
whenever the pattern trigger is set for a LED class device,
whereas it should happen only on LED class device initialization,
if linux,default-trigger is set to "pattern".

What we would need for making that work is a generic support for
parsing trigger specific initialization data in the
of_led_classdev_register().

> +
> return 0;
> }
>
>

--
Best regards,
Jacek Anaszewski

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