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SubjectRe: [PATCH v10 06/16] leds: lp50xx: Add the LP50XX family of the RGB LED driver
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Dan,

On 10/1/19 4:56 PM, Dan Murphy wrote:
> Introduce the LP5036/30/24/18/12/9 RGB LED driver.
> The difference in these parts are the number of
> LED outputs where the:
>
> LP5036 can control 36 LEDs
> LP5030 can control 30 LEDs
> LP5024 can control 24 LEDs
> LP5018 can control 18 LEDs
> LP5012 can control 12 LEDs
> LP5009 can control 9 LEDs
>
> The device has the ability to group LED output into control banks
> so that multiple LED banks can be controlled with the same mixing and
> brightness. Inversely the LEDs can also be controlled independently.
>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
> drivers/leds/Kconfig | 11 +
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-lp50xx.c | 784 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 796 insertions(+)
> create mode 100644 drivers/leds/leds-lp50xx.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index cfb1ebb6517f..84f60e35c5ee 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -363,6 +363,17 @@ config LEDS_LP3952
> To compile this driver as a module, choose M here: the
> module will be called leds-lp3952.
>
> +config LEDS_LP50XX
> + tristate "LED Support for TI LP5036/30/24/18/12/9 LED driver chip"
> + depends on LEDS_CLASS && REGMAP_I2C
> + depends on LEDS_CLASS_MULTI_COLOR
> + help
> + If you say yes here you get support for the Texas Instruments
> + LP5036, LP5030, LP5024, LP5018, LP5012 and LP5009 LED driver.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called leds-lp50xx.
> +
> config LEDS_LP55XX_COMMON
> tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
> depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 841038cfe35b..7a208a0f7b84 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
> obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
> obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
> obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o
> +obj-$(CONFIG_LEDS_LP50XX) += leds-lp50xx.o
> obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
> obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
> obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
> diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
[...]
> +static int lp50xx_probe_dt(struct lp50xx *priv)
> +{
> + u32 led_banks[LP5036_MAX_LED_MODULES];
> + struct fwnode_handle *child = NULL;
> + struct fwnode_handle *led_node = NULL;
> + struct led_init_data init_data;
> + struct lp50xx_led *led;
> + int num_colors;
> + u32 color_id;
> + int led_number;
> + size_t i = 0;
> + int ret;
> +
> + priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
> + "enable", GPIOD_OUT_LOW);
> + if (IS_ERR(priv->enable_gpio)) {
> + ret = PTR_ERR(priv->enable_gpio);
> + dev_err(&priv->client->dev, "Failed to get enable gpio: %d\n",
> + ret);
> + return ret;
> + }
> +
> + priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
> + if (IS_ERR(priv->regulator))
> + priv->regulator = NULL;
> +
> + device_for_each_child_node(&priv->client->dev, child) {
> + led = &priv->leds[i];
> + if (fwnode_property_present(child, "ti,led-bank")) {
> + ret = fwnode_property_read_u32_array(child,
> + "ti,led-bank",
> + NULL, 0);
> + ret = fwnode_property_read_u32_array(child,
> + "ti,led-bank",
> + led_banks,
> + ret);

You could check if bank numbers are within a range.

> + if (ret) {
> + dev_err(&priv->client->dev,
> + "led-bank property is missing\n");
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> +
> + priv->num_of_banked_leds = ARRAY_SIZE(led_banks);
> +
> + ret = lp50xx_set_banks(priv, led_banks);
> + if (ret) {
> + dev_err(&priv->client->dev,
> + "Cannot setup banked LEDs\n");
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> + led->ctrl_bank_enabled = 1;
> +
> + } else {
> + ret = fwnode_property_read_u32(child, "reg",
> + &led_number);

The same applies to the led_number.

> + if (ret) {
> + dev_err(&priv->client->dev,
> + "led reg property missing\n");
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> +
> + led->led_number = led_number;
> + }

--
Best regards,
Jacek Anaszewski

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