linux-kernel - Re: [PATCH v3 4/4] backlight: add led-backlight driver

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Message-ID: <20190710191637.GD22995@amd>
Date:   Wed, 10 Jul 2019 21:16:37 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     jacek.anaszewski@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, lee.jones@...aro.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com, dmurphy@...com,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, tomi.valkeinen@...com
Subject: Re: [PATCH v3 4/4] backlight: add led-backlight driver

On Wed 2019-07-10 14:39:32, Jean-Jacques Hiblot wrote:
> From: Tomi Valkeinen <tomi.valkeinen@...com>
> 
> This patch adds a led-backlight driver (led_bl), which is similar to
> pwm_bl except the driver uses a LED class driver to adjust the
> brightness in the HW. Multiple LEDs can be used for a single backlight.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>

> +
> +		/*
> +		 *try to map actual LED brightness to backlight brightness
> +		 * level
> +		 */

"* Try"

> +		db = priv->default_brightness;
> +		for (i = 0 ; i < num_levels; i++) {
> +			if ((i && db > levels[i-1]) && db <= levels[i])
> +				break;
> +		}
> +		priv->default_brightness = i;
> +		priv->max_brightness = num_levels - 1;
> +		priv->levels = levels;
> +	} else if (num_levels >= 0)
> +		dev_warn(dev, "not enought levels defined\n");

"Not enough"

> +	ret = of_property_read_u32(node, "default-brightness-level", &value);
> +	if (!ret && value <= priv->max_brightness)
> +		priv->default_brightness = value;
> +	else if (!ret  && value > priv->max_brightness)
> +		dev_warn(dev, "invalid default brightness. ignoring it\n");

"Invalid... Ignoring it."

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

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

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