linux-kernel - Re: [PATCH v3 2/2] leds: add sgm3140 driver

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Date:   Mon, 27 Apr 2020 11:51:02 +0200
From:   Pavel Machek <pavel@....cz>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     linux-leds@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        Heiko Stuebner <heiko@...ech.de>,
        Icenowy Zheng <icenowy@...c.io>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 2/2] leds: add sgm3140 driver

Hi!

> Add a driver for the SGMICRO SGM3140 Buck/Boost Charge Pump LED driver.
> 
> This device is controlled by two GPIO pins, one for enabling and the
> second one for switching between torch and flash mode.
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>

Thanks, applied, but... I may remove it again.

> +++ b/drivers/leds/leds-sgm3140.c
> @@ -0,0 +1,320 @@
> +// SPDX-License-Identifier: GPL-2.0

Would you consider GPL-2+?

> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,

Ok.

> +static int sgm3140_probe(struct platform_device *pdev)
> +{
...
> +	led_cdev->brightness_set_blocking = sgm3140_brightness_set;
> +	led_cdev->max_brightness = LED_ON;

Don't do this, unless you really have 255 levels of brightness.

> +	/* Create V4L2 Flash subdev */
> +	priv->v4l2_flash = v4l2_flash_init(&pdev->dev,
> +					   child_node,
> +					   fled_cdev, NULL,
> +					   &v4l2_sd_cfg);
> +	if (IS_ERR(priv->v4l2_flash)) {

Does this need some #ifdef guards?

> +		ret = PTR_ERR(priv->v4l2_flash);
> +		goto err;
> +	}
> +
> +	return ret;

Should this return 0?

> +err:
> +	fwnode_handle_put(child_node);
> +	return ret;
> +}

Does non-error path needs handle_put, too?

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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