v4.19.13 snapshot.
diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c
new file mode 100644
index 0000000..1df9143
--- /dev/null
+++ b/drivers/iio/dac/ad5686-spi.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R,
+ * AD5684, AD5684R, AD5685R, AD5686, AD5686R
+ * Digital to analog converters driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#include "ad5686.h"
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+
+static int ad5686_spi_write(struct ad5686_state *st,
+ u8 cmd, u8 addr, u16 val)
+{
+ struct spi_device *spi = to_spi_device(st->dev);
+ u8 tx_len, *buf;
+
+ switch (st->chip_info->regmap_type) {
+ case AD5683_REGMAP:
+ st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+ AD5683_DATA(val));
+ buf = &st->data[0].d8[1];
+ tx_len = 3;
+ break;
+ case AD5686_REGMAP:
+ st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+ AD5686_ADDR(addr) |
+ val);
+ buf = &st->data[0].d8[1];
+ tx_len = 3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return spi_write(spi, buf, tx_len);
+}
+
+static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
+{
+ struct spi_transfer t[] = {
+ {
+ .tx_buf = &st->data[0].d8[1],
+ .len = 3,
+ .cs_change = 1,
+ }, {
+ .tx_buf = &st->data[1].d8[1],
+ .rx_buf = &st->data[2].d8[1],
+ .len = 3,
+ },
+ };
+ struct spi_device *spi = to_spi_device(st->dev);
+ u8 cmd = 0;
+ int ret;
+
+ if (st->chip_info->regmap_type == AD5686_REGMAP)
+ cmd = AD5686_CMD_READBACK_ENABLE;
+ else if (st->chip_info->regmap_type == AD5683_REGMAP)
+ cmd = AD5686_CMD_READBACK_ENABLE_V2;
+
+ st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+ AD5686_ADDR(addr));
+ st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
+
+ ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
+ if (ret < 0)
+ return ret;
+
+ return be32_to_cpu(st->data[2].d32);
+}
+
+static int ad5686_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+
+ return ad5686_probe(&spi->dev, id->driver_data, id->name,
+ ad5686_spi_write, ad5686_spi_read);
+}
+
+static int ad5686_spi_remove(struct spi_device *spi)
+{
+ return ad5686_remove(&spi->dev);
+}
+
+static const struct spi_device_id ad5686_spi_id[] = {
+ {"ad5672r", ID_AD5672R},
+ {"ad5676", ID_AD5676},
+ {"ad5676r", ID_AD5676R},
+ {"ad5681r", ID_AD5681R},
+ {"ad5682r", ID_AD5682R},
+ {"ad5683", ID_AD5683},
+ {"ad5683r", ID_AD5683R},
+ {"ad5684", ID_AD5684},
+ {"ad5684r", ID_AD5684R},
+ {"ad5685", ID_AD5685R}, /* Does not exist */
+ {"ad5685r", ID_AD5685R},
+ {"ad5686", ID_AD5686},
+ {"ad5686r", ID_AD5686R},
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
+
+static struct spi_driver ad5686_spi_driver = {
+ .driver = {
+ .name = "ad5686",
+ },
+ .probe = ad5686_spi_probe,
+ .remove = ad5686_spi_remove,
+ .id_table = ad5686_spi_id,
+};
+
+module_spi_driver(ad5686_spi_driver);
+
+MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
+MODULE_LICENSE("GPL v2");