drivers: led: Add lp5569 led controller driver

Add a minimal driver for the ti lp5569 led controller. The driver supports
multiple instances. Commands on|off|set_brightness are supported.

Signed-off-by: Jonas Remmert <j.remmert@phytec.de>

drivers/led/CMakeLists.txt

@@ -11,6 +11,7 @@ zephyr_library_sources_ifdef(CONFIG_LED_XEC led_mchp_xec.c)
 zephyr_library_sources_ifdef(CONFIG_LP3943 lp3943.c)
 zephyr_library_sources_ifdef(CONFIG_LP503X lp503x.c)
 zephyr_library_sources_ifdef(CONFIG_LP5562 lp5562.c)
+zephyr_library_sources_ifdef(CONFIG_LP5569 lp5569.c)
 zephyr_library_sources_ifdef(CONFIG_PCA9633 pca9633.c)
 zephyr_library_sources_ifdef(CONFIG_TLC59108 tlc59108.c)
 

drivers/led/Kconfig

@@ -31,6 +31,7 @@ source "drivers/led/Kconfig.ht16k33"
 source "drivers/led/Kconfig.lp3943"
 source "drivers/led/Kconfig.lp503x"
 source "drivers/led/Kconfig.lp5562"
+source "drivers/led/Kconfig.lp5569"
 source "drivers/led/Kconfig.pca9633"
 source "drivers/led/Kconfig.pwm"
 source "drivers/led/Kconfig.tlc59108"

drivers/led/Kconfig.lp5569

@@ -0,0 +1,11 @@
+# Copyright (c) 2023 Phytec Messtechnik GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config LP5569
+	bool "LP5569 LED driver"
+	default y
+	depends on DT_HAS_TI_LP5569_ENABLED
+	select I2C
+	help
+	  Enable LED driver for LP5569. LP5569 LED driver has 9 channels.
+	  Each channel can drive up to 25.5 mA per LED.

drivers/led/lp5569.c

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2023 Phytec Messtechnik GmbH.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT ti_lp5569
+
+/**
+ * @file
+ * @brief LP5569 LED controller
+ *
+ * The LP5569 is a 9-channel LED driver that communicates over I2C.
+ */
+
+#include <zephyr/drivers/i2c.h>
+#include <zephyr/drivers/led.h>
+#include <zephyr/device.h>
+#include <zephyr/kernel.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(lp5569, CONFIG_LED_LOG_LEVEL);
+
+#define LP5569_NUM_LEDS			9
+
+/* General Registers */
+#define LP5569_CONFIG			0x00
+#define LP5569_CHIP_EN			BIT(6)
+
+#define LP5569_MISC			0x2F
+#define LP5569_POWERSAVE_EN		BIT(5)
+
+/* PWM base Register for controlling the duty-cycle */
+#define LP5569_LED0_PWM			0x16
+
+struct lp5569_config {
+	struct i2c_dt_spec bus;
+};
+
+static int lp5569_led_set_brightness(const struct device *dev, uint32_t led,
+				     uint8_t brightness)
+{
+	const struct lp5569_config *config = dev->config;
+	uint8_t val;
+	int ret;
+
+	if (led >= LP5569_NUM_LEDS || brightness > 100) {
+		return -EINVAL;
+	}
+
+	/* Map 0-100 % to 0-255 pwm register value */
+	val = brightness * 255 / 100;
+
+	ret = i2c_reg_write_byte_dt(&config->bus, LP5569_LED0_PWM + led, val);
+	if (ret < 0) {
+		LOG_ERR("LED reg update failed");
+		return ret;
+	}
+
+	return 0;
+}
+
+static inline int lp5569_led_on(const struct device *dev, uint32_t led)
+{
+	/* Set LED brightness to 100 % */
+	return lp5569_led_set_brightness(dev, led, 100);
+}
+
+static inline int lp5569_led_off(const struct device *dev, uint32_t led)
+{
+	/* Set LED brightness to 0 % */
+	return lp5569_led_set_brightness(dev, led, 0);
+}
+
+static int lp5569_init(const struct device *dev)
+{
+	const struct lp5569_config *config = dev->config;
+	int ret;
+
+	if (!i2c_is_ready_dt(&config->bus)) {
+		LOG_ERR("I2C device not ready");
+		return -ENODEV;
+	}
+
+	ret = i2c_reg_write_byte_dt(&config->bus, LP5569_CONFIG,
+				    LP5569_CHIP_EN);
+	if (ret < 0) {
+		LOG_ERR("Enable LP5569 failed");
+		return ret;
+	}
+
+	ret = i2c_reg_write_byte_dt(&config->bus, LP5569_MISC,
+				    LP5569_POWERSAVE_EN);
+	if (ret < 0) {
+		LOG_ERR("LED reg update failed");
+		return ret;
+	}
+
+	return 0;
+}
+
+
+static const struct led_driver_api lp5569_led_api = {
+	.set_brightness = lp5569_led_set_brightness,
+	.on = lp5569_led_on,
+	.off = lp5569_led_off,
+};
+
+#define LP5569_DEFINE(id)						\
+	static const struct lp5569_config lp5569_config_##id = {	\
+		.bus = I2C_DT_SPEC_INST_GET(id),			\
+	};								\
+									\
+	DEVICE_DT_INST_DEFINE(id, &lp5569_init,				\
+			      NULL,					\
+			      NULL,					\
+			      &lp5569_config_##id, POST_KERNEL,		\
+			      CONFIG_LED_INIT_PRIORITY,			\
+			      &lp5569_led_api);
+
+DT_INST_FOREACH_STATUS_OKAY(LP5569_DEFINE)

dts/bindings/led/ti,lp5569.yaml

@@ -0,0 +1,5 @@
+description: TI LP5569 LED
+
+compatible: "ti,lp5569"
+
+include: i2c-device.yaml