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

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Date:   Thu, 10 Sep 2020 07:49:33 +0800
From:   Gene Chen <gene.chen.richtek@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     jacek.anaszewski@...il.com, robh+dt@...nel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Dan Murphy <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 <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

Pavel Machek <pavel@....cz> 於 2020年9月9日 週三 上午6:25寫道：
>
> 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.
>

ACK

> "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?
>

1. set FLED1 brightness
# echo 1 > /sys/class/leds/white:flash1/flash_brightness
2. enable FLED1 strobe
# echo 1 > /sys/class/leds/white:flash1/flash_strobe
3 . turn off FLED1 strobe (just used to gaurantee the strobe mode
flash leds must be turned off)
# echo 0 > /sys/class/leds/white:flash1/flash_strobe

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