From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH v3 2/5] leds: Add helper for getting default pattern from
 Device Tree
Date: Wed, 12 Dec 2018 13:22:27 +0100
Message-ID: <20181212122227.GB11088@amd>
References: <1544613406-27026-1-git-send-email-krzk@kernel.org>
 <1544613406-27026-3-git-send-email-krzk@kernel.org>
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In-Reply-To: <1544613406-27026-3-git-send-email-krzk@kernel.org>
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To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Baolin Wang <baolin.wang@linaro.org>, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
List-Id: linux-leds@vger.kernel.org


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On Wed 2018-12-12 12:16:43, Krzysztof Kozlowski wrote:
> Multiple LED triggers might need to access default pattern so add a
> helper for that.
>=20
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Acked-by: Pavel Machek <pavel@ucw.cz>

>=20
> New patch in the series
>=20
> ---
>  drivers/leds/led-class.c | 25 +++++++++++++++++++++++++
>  include/linux/leds.h     |  3 +++
>  2 files changed, 28 insertions(+)
>=20
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 3c7e3487b373..44b95e6480f6 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -17,6 +17,7 @@
>  #include <linux/leds.h>
>  #include <linux/list.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/slab.h>
>  #include <linux/spinlock.h>
>  #include <linux/timer.h>
> @@ -244,6 +245,30 @@ static int led_classdev_next_name(const char *init_n=
ame, char *name,
>  }
> =20
>  /**
> + * led_classdev_get_default_pattern - return default pattern
> + *
> + * @led_cdev: the led_classdev structure for this device
> + *
> + * Return: Null terminated string with default pattern from DeviceTree o=
r NULL
> + */

Is it valid kerneldoc? Note that core still owns the string so that
caller is not expected to free it?

> +const char *led_classdev_get_default_pattern(struct led_classdev *led_cd=
ev)
> +{
> +	struct device_node *np =3D dev_of_node(led_cdev->dev);
> +	const char *pattern;
> +
> +	if (!np)
> +		return NULL;
> +
> +	if (of_property_read_string(np, "led-pattern", &pattern))
> +		return NULL;
> +
> +	if (!strlen(pattern))
> +		return NULL;
> +
> +	return pattern;
> +}
> +
> +/**
>   * of_led_classdev_register - register a new object of led_classdev clas=
s.
>   *
>   * @parent: parent of LED device
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 5263f87e1d2c..9da2bfa183ea 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -129,6 +129,9 @@ struct led_classdev {
>  	struct mutex		led_access;
>  };
> =20
> +extern const char *
> +led_classdev_get_default_pattern(struct led_classdev *led_cdev);
> +
>  extern int of_led_classdev_register(struct device *parent,
>  				    struct device_node *np,
>  				    struct led_classdev *led_cdev);

--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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