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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 1 Jun 2022 11:57:15 +0200
Message-ID: <CAHp75VdUQqihr=AX-wEUD05jY1ReL63hMCL+eaqmjkN8CsS_Vg@mail.gmail.com>
Subject: Re: [PATCH 07/14] leds: flashlight: mt6370: Add Mediatek MT6370
 flashlight support
To:     ChiaEn Wu <peterwu.pub@gmail.com>
Cc:     Lee Jones <lee.jones@linaro.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Jingoo Han <jingoohan1@gmail.com>, Pavel Machek <pavel@ucw.cz>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@linux.intel.com>,
        Helge Deller <deller@gmx.de>, cy_huang@richtek.com,
        alice_chen@richtek.com, chiaen_wu@richtek.com,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Linux LED Subsystem <linux-leds@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux PM <linux-pm@vger.kernel.org>,
        USB <linux-usb@vger.kernel.org>,
        linux-iio <linux-iio@vger.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@vger.kernel.org>
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On Tue, May 31, 2022 at 1:32 PM ChiaEn Wu <peterwu.pub@gmail.com> wrote:
>
> From: Alice Chen <alice_chen@richtek.com>
>
> Add Mediatek MT6370 flashlight support

Same comments about the commit message.

...

> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>

+ blank line?

> +#include <media/v4l2-flash-led-class.h>

+ blank line

> +enum {
> +       MT6370_LED_FLASH1,
> +       MT6370_LED_FLASH2,
> +       MT6370_MAX_LEDS
> +};

...

> +       struct mt6370_led *led = container_of(fl_cdev, struct mt6370_led,
> +                                             flash);

> +       struct mt6370_led *led = container_of(fl_cdev, struct mt6370_led,
> +                                             flash);

Make a helper out of this

  #define to_mt637_led()  container_of()

and reuse.

...

> +       /*
> +        * For the flash turn on/off, HW rampping up/down time is 5ms/500us,

ramping

> +        * respectively

Period!

> +        */

...

> +       const char * const states[] = { "off", "keep", "on" };
> +       const char *str;
> +       int ret;
> +
> +       if (!fwnode_property_read_string(init_data->fwnode,
> +                                        "default-state", &str)) {
> +               ret = match_string(states, ARRAY_SIZE(states), str);
> +               if (ret < 0)
> +                       ret = STATE_OFF;
> +
> +               led->default_state = ret;
> +       }

fwnode_property_match_string()?

...

> +       if (!count || count > MT6370_MAX_LEDS) {
> +               dev_err(&pdev->dev,
> +               "No child node or node count over max led number %lu\n", count);
> +               return -EINVAL;

return dev_err_probe(...);

> +       }


--
With Best Regards,
Andy Shevchenko