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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Mon, 25 Jul 2022 10:40:32 +0200
Message-ID: <CAHp75VewxvEDGoPdRBvLSLQOQ6OZzVft1ce3DkF7MK_O1VXZkQ@mail.gmail.com>
Subject: Re: [PATCH v6 11/13] leds: rgb: mt6370: Add MediaTek MT6370 current
 sink type LED Indicator 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>,
        ChiaEn Wu <chiaen_wu@richtek.com>,
        Alice Chen <alice_chen@richtek.com>,
        cy_huang <cy_huang@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>,
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        USB <linux-usb@vger.kernel.org>,
        linux-iio <linux-iio@vger.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@vger.kernel.org>,
        szuni chen <szunichen@gmail.com>
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On Fri, Jul 22, 2022 at 12:25 PM ChiaEn Wu <peterwu.pub@gmail.com> wrote:
>
> From: ChiYuan Huang <cy_huang@richtek.com>

^^^^ (Note this and read below)

>
> The MediaTek MT6370 is a highly-integrated smart power management IC,
> which includes a single cell Li-Ion/Li-Polymer switching battery
> charger, a USB Type-C & Power Delivery (PD) controller, dual
> Flash LED current sources, a RGB LED driver, a backlight WLED driver,
> a display bias driver and a general LDO for portable devices.
>
> In MediaTek MT6370, there are four channel current-sink RGB LEDs that
> support hardware pattern for constant current, PWM, and breath mode.
> Isink4 channel can also be used as a CHG_VIN power good indicator.

> Signed-off-by: Alice Chen <alice_chen@richtek.com>
> Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>

In conjunction with above what SoB of Alice means?

You really need to take your time and (re-)read
https://www.kernel.org/doc/html/latest/process/submitting-patches.html.

...

> + * Author: Alice Chen <alice_chen@richtek.com>
> + * Author: ChiYuan Huang <cy_huang@richtek.com>

Would
 * Authors:
 *    Name_of_Author 1
 *    Name_of_Author 2

work for you?

...

> +struct mt6370_led {
> +       union {
> +               struct led_classdev isink;
> +               struct led_classdev_mc mc;
> +       };

Where is the field that makes union work?

> +       struct mt6370_priv *priv;
> +       u32 default_state;
> +       u32 index;
> +};

...

> +static int mt6370_gen_breath_pattern(struct mt6370_priv *priv,
> +                                    struct led_pattern *pattern, u32 len,
> +                                    u8 *pattern_val, u32 val_len)
> +{
> +       enum mt6370_led_ranges sel_range;
> +       struct led_pattern *curr;
> +       unsigned int sel;
> +       u8 val[P_MAX_PATTERNS / 2] = {};
> +       int i;
> +
> +       if (len < P_MAX_PATTERNS && val_len < P_MAX_PATTERNS / 2)
> +               return -EINVAL;
> +
> +       /*
> +        * Pattern list
> +        * tr1: byte 0, b'[7: 4]
> +        * tr2: byte 0, b'[3: 0]
> +        * tf1: byte 1, b'[7: 4]
> +        * tf2: byte 1, b'[3: 0]
> +        * ton: byte 2, b'[7: 4]
> +        * toff: byte 2, b'[3: 0]
> +        */
> +       for (i = 0; i < P_MAX_PATTERNS; i++) {
> +               curr = pattern + i;
> +
> +               sel_range = i == P_LED_TOFF ? R_LED_TOFF : R_LED_TRFON;
> +
> +               linear_range_get_selector_within(priv->ranges + sel_range,
> +                                                curr->delta_t, &sel);
> +
> +               val[i / 2] |= sel << (4 * ((i + 1) % 2));
> +       }
> +
> +       memcpy(pattern_val, val, 3);

Isn't it something like put_unaligned_be24()/put_unaligned_le24()?


> +       return 0;
> +}

...

> +static inline int mt6370_mc_pattern_clear(struct led_classdev *lcdev)
> +{
> +       struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
> +       struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
> +       struct mt6370_priv *priv = led->priv;
> +       struct mc_subled *subled;

> +       int i, ret = 0;

Redundant assignment.

> +       mutex_lock(&led->priv->lock);
> +
> +       for (i = 0; i < mccdev->num_colors; i++) {
> +               subled = mccdev->subled_info + i;
> +
> +               ret = mt6370_set_led_mode(priv, subled->channel,
> +                                         MT6370_LED_REG_MODE);
> +               if (ret)
> +                       break;
> +       }
> +
> +       mutex_unlock(&led->priv->lock);
> +
> +       return ret;
> +}

...

> +       if (!fwnode_property_read_string(init_data->fwnode, "default-state",
> +                                        &stat_str)) {

ret = fwnode_...(...);
if (!ret)

> +               ret = match_string(states, ARRAY_SIZE(states), stat_str);
> +               if (ret < 0)
> +                       ret = STATE_OFF;
> +
> +               led->default_state = ret;
> +       }

...

> +       int i = 0, ret;

unsigned int i = 0;
int ret;

-- 
With Best Regards,
Andy Shevchenko