[PATCH v2 3/7] iio: tsl2772: add support for reading power settings from device tree

[Brian Masney <masneyb@onstation.org>]

This patch adds support for optionally reading the prox_diode and
prox_power settings from device tree. This was tested using a LG
Nexus 5 (hammerhead) which requires a different diode than the driver
default for the IR LED.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
The next patch in the series removes the tsl2772 driver from the
trivial-devices.txt file. I separated it out so that change can go
through device tree.

 .../devicetree/bindings/iio/light/tsl2772.txt | 39 +++++++++++++++++++
 drivers/iio/light/tsl2772.c                   | 16 ++++++++
 include/dt-bindings/iio/amstaos,tsl2772.h     | 24 ++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/light/tsl2772.txt
 create mode 100644 include/dt-bindings/iio/amstaos,tsl2772.h

diff --git a/Documentation/devicetree/bindings/iio/light/tsl2772.txt b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
new file mode 100644
index 000000000000..ab553d52b9fc
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
@@ -0,0 +1,39 @@
+* AMS/TAOS ALS and proximity sensor
+
+Required properties:
+
+  - compatible: Should be one of
+		"amstaos,tsl2571"
+		"amstaos,tsl2671"
+		"amstaos,tmd2671"
+		"amstaos,tsl2771"
+		"amstaos,tmd2771"
+		"amstaos,tsl2572"
+		"amstaos,tsl2672"
+		"amstaos,tmd2672"
+		"amstaos,tsl2772"
+		"amstaos,tmd2772"
+  - reg: the I2C address of the device
+
+Optional properties:
+
+  - amstaos,prox_diode - must be TSL2772_DIODE0, TSL2772_DIODE1, or
+                         TSL2772_DIODE_BOTH.
+  - amstaos,prox_power - must be TSL2772_100_mA, TSL2772_50_mA, TSL2772_25_mA,
+                         or TSL2772_13_mA.
+  - interrupt-parent: should be the phandle for the interrupt controller
+  - interrupts: the sole interrupt generated by the device
+
+  Refer to interrupt-controller/interrupts.txt for generic interrupt client
+  node bindings.
+
+Example:
+
+#include <dt-bindings/iio/amstaos,tsl2772.h>
+
+tsl2772@39 {
+	compatible = "amstaos,tsl2772";
+	reg = <0x39>;
+	interrupts-extended = <&msmgpio 61 IRQ_TYPE_EDGE_FALLING>;
+	amstaos,prox_diode = <TSL2772_DIODE0>;
+};
diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
index 34d42a2504c9..0be57f2ecb02 100644
--- a/drivers/iio/light/tsl2772.c
+++ b/drivers/iio/light/tsl2772.c
@@ -515,6 +515,18 @@ static int tsl2772_get_prox(struct iio_dev *indio_dev)
 	return ret;
 }
 
+#ifdef CONFIG_OF
+static void tsl2772_parse_dt(struct tsl2772_chip *chip)
+{
+	struct device_node *of_node = chip->client->dev.of_node;
+
+	of_property_read_u32(of_node, "amstaos,prox_diode",
+			     &chip->settings.prox_diode);
+	of_property_read_u32(of_node, "amstaos,prox_power",
+			     &chip->settings.prox_power);
+}
+#endif
+
 /**
  * tsl2772_defaults() - Populates the device nominal operating parameters
  *                      with those provided by a 'platform' data struct or
@@ -541,6 +553,10 @@ static void tsl2772_defaults(struct tsl2772_chip *chip)
 		memcpy(chip->tsl2772_device_lux,
 		       tsl2772_default_lux_table_group[chip->id],
 		       TSL2772_DEFAULT_TABLE_BYTES);
+
+#ifdef CONFIG_OF
+	tsl2772_parse_dt(chip);
+#endif
 }
 
 /**
diff --git a/include/dt-bindings/iio/amstaos,tsl2772.h b/include/dt-bindings/iio/amstaos,tsl2772.h
new file mode 100644
index 000000000000..ad6f9fbc0845
--- /dev/null
+++ b/include/dt-bindings/iio/amstaos,tsl2772.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Device driver for monitoring ambient light intensity (lux)
+ * and proximity (prox) within the TAOS TSL2772 family of devices.
+ *
+ * Copyright (c) 2012 TAOS Corporation.
+ * Copyright (c) 2017-2018 Brian Masney <masneyb@onstation.org>
+ */
+
+#ifndef _DT_BINDINGS_AMSTAOS_TSL2772_H
+#define _DT_BINDINGS_AMSTAOS_TSL2772_H
+
+/* Proximity diode to use */
+#define TSL2772_DIODE0                  0x01
+#define TSL2772_DIODE1                  0x02
+#define TSL2772_DIODE_BOTH              0x03
+
+/* LED Power */
+#define TSL2772_100_mA                  0x00
+#define TSL2772_50_mA                   0x01
+#define TSL2772_25_mA                   0x02
+#define TSL2772_13_mA                   0x03
+
+#endif /* _DT_BINDINGS_AMSTAOS_TSL2772_H */
-- 
2.17.1