v4.19.13 snapshot.
diff --git a/drivers/leds/leds-syscon.c b/drivers/leds/leds-syscon.c
new file mode 100644
index 0000000..3be40f7
--- /dev/null
+++ b/drivers/leds/leds-syscon.c
@@ -0,0 +1,155 @@
+/*
+ * Generic Syscon LEDs Driver
+ *
+ * Copyright (c) 2014, Linaro Limited
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/leds.h>
+
+/**
+ * struct syscon_led - state container for syscon based LEDs
+ * @cdev: LED class device for this LED
+ * @map: regmap to access the syscon device backing this LED
+ * @offset: the offset into the syscon regmap for the LED register
+ * @mask: the bit in the register corresponding to the LED
+ * @state: current state of the LED
+ */
+struct syscon_led {
+ struct led_classdev cdev;
+ struct regmap *map;
+ u32 offset;
+ u32 mask;
+ bool state;
+};
+
+static void syscon_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct syscon_led *sled =
+ container_of(led_cdev, struct syscon_led, cdev);
+ u32 val;
+ int ret;
+
+ if (value == LED_OFF) {
+ val = 0;
+ sled->state = false;
+ } else {
+ val = sled->mask;
+ sled->state = true;
+ }
+
+ ret = regmap_update_bits(sled->map, sled->offset, sled->mask, val);
+ if (ret < 0)
+ dev_err(sled->cdev.dev, "error updating LED status\n");
+}
+
+static int syscon_led_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct device *parent;
+ struct regmap *map;
+ struct syscon_led *sled;
+ const char *state;
+ int ret;
+
+ parent = dev->parent;
+ if (!parent) {
+ dev_err(dev, "no parent for syscon LED\n");
+ return -ENODEV;
+ }
+ map = syscon_node_to_regmap(parent->of_node);
+ if (IS_ERR(map)) {
+ dev_err(dev, "no regmap for syscon LED parent\n");
+ return PTR_ERR(map);
+ }
+
+ sled = devm_kzalloc(dev, sizeof(*sled), GFP_KERNEL);
+ if (!sled)
+ return -ENOMEM;
+
+ sled->map = map;
+
+ if (of_property_read_u32(np, "offset", &sled->offset))
+ return -EINVAL;
+ if (of_property_read_u32(np, "mask", &sled->mask))
+ return -EINVAL;
+ sled->cdev.name =
+ of_get_property(np, "label", NULL) ? : np->name;
+ sled->cdev.default_trigger =
+ of_get_property(np, "linux,default-trigger", NULL);
+
+ state = of_get_property(np, "default-state", NULL);
+ if (state) {
+ if (!strcmp(state, "keep")) {
+ u32 val;
+
+ ret = regmap_read(map, sled->offset, &val);
+ if (ret < 0)
+ return ret;
+ sled->state = !!(val & sled->mask);
+ } else if (!strcmp(state, "on")) {
+ sled->state = true;
+ ret = regmap_update_bits(map, sled->offset,
+ sled->mask,
+ sled->mask);
+ if (ret < 0)
+ return ret;
+ } else {
+ sled->state = false;
+ ret = regmap_update_bits(map, sled->offset,
+ sled->mask, 0);
+ if (ret < 0)
+ return ret;
+ }
+ }
+ sled->cdev.brightness_set = syscon_led_set;
+
+ ret = led_classdev_register(dev, &sled->cdev);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, sled);
+ dev_info(dev, "registered LED %s\n", sled->cdev.name);
+
+ return 0;
+}
+
+static const struct of_device_id of_syscon_leds_match[] = {
+ { .compatible = "register-bit-led", },
+ {},
+};
+
+static struct platform_driver syscon_led_driver = {
+ .probe = syscon_led_probe,
+ .driver = {
+ .name = "leds-syscon",
+ .of_match_table = of_syscon_leds_match,
+ .suppress_bind_attrs = true,
+ },
+};
+builtin_platform_driver(syscon_led_driver);