linux-kernel - Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360

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Date:   Wed, 9 Sep 2020 00:25:44 +0200
From:   Pavel Machek <pavel@....cz>
To:     Gene Chen <gene.chen.richtek@...il.com>
Cc:     jacek.anaszewski@...il.com, robh+dt@...nel.org,
        matthias.bgg@...il.com, dmurphy@...com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360

Hi!

> From: Gene Chen <gene_chen@...htek.com>
> 
> Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> and 4-channel RGB LED support Register/Flash/Breath Mode
> 
> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>  drivers/leds/Kconfig       |  11 +
>  drivers/leds/Makefile      |   1 +
>  drivers/leds/leds-mt6360.c | 681 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 693 insertions(+)
>  create mode 100644 drivers/leds/leds-mt6360.c
> 
> +	help
> +	  This option enables support for dual Flash LED drivers found on
> +	  Mediatek MT6360 PMIC.
> +	  Independent current sources supply for each flash LED support torch and strobe mode.
> +	  Includes Low-VF and short protection.
> +

80 columns. And perhaps user does not need to know about protections... and actually
about independend sources, either.

"Enable this for RGB LED and flash LED support on..."?

> +static int mt6360_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{
> +	struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
> +	struct mt6360_priv *priv = led->priv;
> +	u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> +	u32 val = (level) ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> +	u32 prev = priv->fled_torch_used, curr;
> +	int ret;
> +
> +	dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
> +	if (priv->fled_strobe_used) {
> +		dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
> +		return -EINVAL;
> +	}

So... how does its userland interface look like?

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