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Subject[PATCH leds v1 09/10] leds: lm36274: use struct led_init_data when registering
Date
By using struct led_init_data when registering we do not need to parse
`label` DT property nor `linux,default-trigger` property.

A small refactor was also done:
- with using devm_led_classdev_register_ext the driver remove method is
not needed
- since only one child node is allowed for this driver, use
device_get_next_child_node instead of device_for_each_child_node

Previously if the `label` DT property was not present, the code composed
name for the LED in the form
"parent_name::"
For backwards compatibility we therefore set
init_data->default_label = ":";
so that the LED will not get a different name if `label` property is not
present.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Dan Murphy <dmurphy@ti.com>
---
drivers/leds/leds-lm36274.c | 100 ++++++++++++++++++------------------
1 file changed, 49 insertions(+), 51 deletions(-)

diff --git a/drivers/leds/leds-lm36274.c b/drivers/leds/leds-lm36274.c
index bfeee03a0053c..7ec53b4669eac 100644
--- a/drivers/leds/leds-lm36274.c
+++ b/drivers/leds/leds-lm36274.c
@@ -67,61 +67,53 @@ static int lm36274_init(struct lm36274 *lm36274_data)
enable_val);
}

-static int lm36274_parse_dt(struct lm36274 *lm36274_data)
+static int lm36274_parse_dt(struct lm36274 *lm36274_data,
+ struct led_init_data *init_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;
+ struct fwnode_handle *fwnode;
+ int ret;

/* There should only be 1 node */
- child_cnt = device_get_child_node_count(dev);
- if (child_cnt != 1)
+ if (device_get_child_node_count(dev) != 1)
return -EINVAL;

- 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_count_u32(child, "led-sources");
- 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 ret;
- }
-
- fwnode_property_read_string(child, "linux,default-trigger",
- &lm36274_data->led_dev.default_trigger);
+ fwnode = device_get_next_child_node(dev, NULL);
+ if (!fwnode)
+ return -ENODEV;

- }
+ init_data->fwnode = fwnode;
+ init_data->devicename = lm36274_data->pdev->name;

- 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;
+ /* for backwards compatibility when `label` property is not present */
+ init_data->default_label = ":";

- 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;
+ lm36274_data->num_leds = fwnode_property_count_u32(fwnode,
+ "led-sources");
+ if (lm36274_data->num_leds <= 0) {
+ ret = -ENODEV;
+ goto err;
+ }
+
+ ret = fwnode_property_read_u32_array(fwnode, "led-sources",
+ lm36274_data->led_sources,
+ lm36274_data->num_leds);
+ if (ret) {
+ dev_err(dev, "led-sources property missing\n");
+ goto err;
+ }

return 0;
+err:
+ fwnode_handle_put(fwnode);
+ return ret;
}

static int lm36274_probe(struct platform_device *pdev)
{
struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
+ struct led_init_data init_data = {};
+ struct device *dev = lmu->dev;
struct lm36274 *lm36274_data;
int ret;

@@ -131,32 +123,39 @@ static int lm36274_probe(struct platform_device *pdev)
return -ENOMEM;

lm36274_data->pdev = pdev;
- lm36274_data->dev = lmu->dev;
+ lm36274_data->dev = dev;
lm36274_data->regmap = lmu->regmap;
platform_set_drvdata(pdev, lm36274_data);

- ret = lm36274_parse_dt(lm36274_data);
+ ret = lm36274_parse_dt(lm36274_data, &init_data);
if (ret) {
- dev_err(lm36274_data->dev, "Failed to parse DT node\n");
+ dev_err(dev, "Failed to parse DT node\n");
return ret;
}

+ 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;
+
ret = lm36274_init(lm36274_data);
if (ret) {
- dev_err(lm36274_data->dev, "Failed to init the device\n");
+ dev_err(dev, "Failed to init the device\n");
return ret;
}

- return led_classdev_register(lm36274_data->dev, &lm36274_data->led_dev);
-}
+ lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
+ lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set;

-static int lm36274_remove(struct platform_device *pdev)
-{
- struct lm36274 *lm36274_data = platform_get_drvdata(pdev);
+ ret = devm_led_classdev_register_ext(dev, &lm36274_data->led_dev,
+ &init_data);
+ if (ret)
+ dev_err(dev, "Failed to register LED for node %pfw\n",
+ init_data.fwnode);

- led_classdev_unregister(&lm36274_data->led_dev);
+ fwnode_handle_put(init_data.fwnode);

- return 0;
+ return ret;
}

static const struct of_device_id of_lm36274_leds_match[] = {
@@ -167,7 +166,6 @@ MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);

static struct platform_driver lm36274_driver = {
.probe = lm36274_probe,
- .remove = lm36274_remove,
.driver = {
.name = "lm36274-leds",
},
--
2.26.2
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