linux-kernel - Re: [PATCH v1 1/2] leds: rt4505: Add support for Richtek RT4505 flash led controller

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Date:   Tue, 27 Oct 2020 09:29:00 +0100
From:   Pavel Machek <pavel@....cz>
To:     cy_huang <u0084500@...il.com>
Cc:     dmurphy@...com, robh+dt@...nel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, cy_huang@...htek.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v1 1/2] leds: rt4505: Add support for Richtek RT4505
 flash led controller

Hi!

> From: ChiYuan Huang <cy_huang@...htek.com>
> 
> Add support for RT4505 flash led controller. It can support up to 1.5A
> flash current with hardware timeout and low input voltage
> protection.

Please use upper-case "LED" everywhere.

This should be 2nd in the series, after DT changes.

> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> ---
>  drivers/leds/Kconfig       |  11 ++
>  drivers/leds/Makefile      |   1 +
>  drivers/leds/leds-rt4505.c | 397 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 409 insertions(+)
>  create mode 100644 drivers/leds/leds-rt4505.c

Lets put this into drivers/leds/flash/. (Yes, you'll have to create
it).


> +	help
> +	  This option enables support for the RT4505 flash led controller.

Information where it is used would be welcome here.

> +	  It can support up to 1.5A flash strobe current with hardware timeout
> +	  and low input voltage protection.

This does not / should not be here.
> +
> +static int rt4505_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{

80 columns, where easy.

> +	struct rt4505_priv *priv = container_of(lcdev, struct rt4505_priv, flash.led_cdev);
> +	u32 val = 0;
> +	int ret;
> +
> +	mutex_lock(&priv->lock);
> +
> +	if (level != LED_OFF) {
> +		ret = regmap_update_bits(priv->regmap, RT4505_REG_ILED, RT4505_ITORCH_MASK,
> +					 (level - 1) << RT4505_ITORCH_SHIFT);
> +		if (ret)
> +			goto unlock;
> +
> +		val = RT4505_TORCH_SET;
> +	}
> +
> +	ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE, RT4505_ENABLE_MASK, val);
> +
> +unlock:
> +	mutex_unlock(&priv->lock);
> +	return ret;
> +}

Why is the locking needed? What will the /sys/class/leds interface
look like on system with your flash?

> +static int rt4505_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
> +{
> +	struct rt4505_priv *priv = container_of(fled_cdev, struct rt4505_priv, flash);
> +	u32 val;
> +	int ret;
> +
> +	mutex_lock(&priv->lock);
> +
> +	ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
> +	if (ret)
> +		goto unlock;
> +
> +	*state = ((val & RT4505_FLASH_GET) == RT4505_FLASH_GET) ? true : false;

No need for ? ... part.

> +static bool rt4505_is_accessible_reg(struct device *dev, unsigned int reg)
> +{
> +	if (reg == RT4505_REG_RESET || (reg >= RT4505_REG_CONFIG  && reg <= RT4505_REG_FLAGS))
> +		return true;

Make this two stagements.

Otherwise... looks like easy simple driver, thanks.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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