linux-kernel - Re: [PATCH 2/4] leds: axp20x: Support charger LED on AXP20x like PMICs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200226140854.GJ4080@duo.ucw.cz>
Date:   Wed, 26 Feb 2020 15:08:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Ondrej Jirman <megous@...ous.com>
Cc:     linux-sunxi@...glegroups.com,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <mripard@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] leds: axp20x: Support charger LED on AXP20x like
 PMICs

Hi!

> There is single LED that can be turned on and off by the user, or set to
> be controlled by the charger in 2 different modes.
> 
> The driver initializes the LED to be controlled by the charger, but
> allows to switch it to user control, and change the mode of charging
> indication via a sysfs.

You'd need to document new "control" file.

But hold on, it is not an only driver with this "user-or-hardware"
feature, and we want to have a common solution. And that solution is
probably to have "hw-charger" trigger _just for this_ LED.

I can easily take a driver that always handles it as a "user" LED, if
you can get ACKs from device tree people on the documentation patches. 

> +	led->regmap = axp20x->regmap;
> +
> +	led->cdev.name = "axp20x-chgarger-led";

typo.

> +static void axp20x_led_shutdown(struct platform_device *pdev)
> +{
> +	struct axp20x_led *led = platform_get_drvdata(pdev);
> +
> +	/* On shutdown, we want to give LED control back to the PMIC,
> +	 * so that it doesn't stay on, while the system is off.
> +	 */

Comment style.

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

Download attachment "signature.asc" of type "application/pgp-signature" (196 bytes)