linux-kernel - Re: [PATCH v2 6/6] leds: lm3692x: Make sure we don't exceed the maximum led current

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Message-ID: <20191226101336.GD4033@amd>
Date:   Thu, 26 Dec 2019 11:13:36 +0100
From:   Pavel Machek <pavel@....cz>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] leds: lm3692x: Make sure we don't exceed the
 maximum led current

On Wed 2019-12-25 12:07:19, Guido Günther wrote:
1;2802;0c> The current is given by the formular from page 12 of
> https://www.ti.com/lit/ds/symlink/lm36922.pdf. We use this to limit the
> led's max_brightness using the led-max-microamp DT property.
> 
> The formular for the lm36923 is identical according to the data
sheet.

formula?

>  static int lm3692x_probe_dt(struct lm3692x_led *led)
>  {
>  	struct fwnode_handle *child = NULL;
>  	struct led_init_data init_data = {};
> -	u32 ovp;
> +	u32 ovp, max_cur;
>  	bool exp_mode;
>  	int ret;
>  
> @@ -397,6 +416,10 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>  		return ret;
>  	}
>  
> +	fwnode_property_read_u32(child, "led-max-microamp", &max_cur);
> +	led->led_dev.max_brightness = ret ? LED_FULL :
> +		lm3692x_max_brightness(led, max_cur);
> +

Umm. Should ret come from this fwnode_property_read_u32()?

With that fixed,

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

(Feel free to wait for Rob before resending the series, and I guess
you can merge it with the next one).

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

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