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Date:   Thu, 6 Jun 2019 12:07:06 +0200
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     jacek.anaszewski@...il.com, broonie@...nel.org,
        lgirdwood@...il.com, lee.jones@...aro.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 5/5] leds: lm36274: Introduce the TI LM36274 LED driver

Hi!

> Introduce the LM36274 LED driver.  This driver uses the ti-lmu
> MFD driver to probe this LED driver.  The driver configures only the
> LED registers and enables the outputs according to the config file.
> 
> The driver utilizes the TI LMU (Lighting Management Unit) LED common
> framework to set the brightness bits.

Nothing too bad, but...

> +static int lm36274_parse_dt(struct lm36274 *lm36274_data)
> +{
> +	struct fwnode_handle *child = NULL;
> +	char label[LED_MAX_NAME_SIZE];
> +	struct device *dev = &lm36274_data->pdev->dev;
> +	const char *name;
> +	int child_cnt;
> +	int ret = -EINVAL;
> +
> +	/* There should only be 1 node */
> +	child_cnt = device_get_child_node_count(dev);
> +	if (child_cnt != 1)
> +		return ret;

I'd do direct "return -EINVAL" here.

> +	device_for_each_child_node(dev, child) {
> +		ret = fwnode_property_read_string(child, "label", &name);
> +		if (ret)
> +			snprintf(label, sizeof(label),
> +				"%s::", lm36274_data->pdev->name);
> +		else
> +			snprintf(label, sizeof(label),
> +				 "%s:%s", lm36274_data->pdev->name, name);
> +
> +		lm36274_data->num_leds = fwnode_property_read_u32_array(child,
> +							  "led-sources",
> +							  NULL, 0);
> +		if (lm36274_data->num_leds <= 0)
> +			return -ENODEV;
> +
> +		ret = fwnode_property_read_u32_array(child, "led-sources",
> +						     lm36274_data->led_sources,
> +						     lm36274_data->num_leds);
> +		if (ret) {
> +			dev_err(dev, "led-sources property missing\n");
> +			return -EINVAL;

Should it return ret here? If read array failed with -ENOMEM, we may
want to propagate that.

> +		}
> +
> +		fwnode_property_read_string(child, "linux,default-trigger",
> +					&lm36274_data->led_dev.default_trigger);
> +
> +	}
> +
> +	lm36274_data->lmu_data.regmap = lm36274_data->regmap;
> +	lm36274_data->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
> +	lm36274_data->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
> +	lm36274_data->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;
> +
> +	lm36274_data->led_dev.name = label;
> +	lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
> +	lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set;
> +
> +	return ret;

I'd do "return 0" here. It is success. Yes, ret will always have that
value at this moment, but...

> +static int lm36274_probe(struct platform_device *pdev)
> +{
> +	struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
> +	struct lm36274 *lm36274_data;
> +	int ret;
> +
> +	lm36274_data = devm_kzalloc(&pdev->dev, sizeof(*lm36274_data),
> +				    GFP_KERNEL);
> +	if (!lm36274_data) {
> +		ret = -ENOMEM;
> +		return ret;
> +	}

Just do return -ENOMEM;

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

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