[PATCH 2/2] backlight: arcxcnn: add "arctic" vendor prefix

[Brian Dodge]

The original patch adding this driver and DT bindings improperly
used "arc" as the vendor-prefix. This adds "arctic" which is the
proper prefix and retains "arc" to allow existing users of the
"arc" prefix to update to new kernels. There is at least one
(Samsung Chromebook Plus)

Signed-off-by: Brian Dodge <bdodge09 at gmail.com>
Acked-by: Daniel Thompson <daniel.thompson at linaro.org>
---
 drivers/video/backlight/arcxcnn_bl.c | 41 +++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/drivers/video/backlight/arcxcnn_bl.c b/drivers/video/backlight/arcxcnn_bl.c
index 7b1c0a0..a419554 100644
--- a/drivers/video/backlight/arcxcnn_bl.c
+++ b/drivers/video/backlight/arcxcnn_bl.c
@@ -1,9 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Backlight driver for ArcticSand ARC_X_C_0N_0N Devices
+ * Backlight driver for pSemi (formerly ArcticSand) ARC_X_C_0N_0N Devices
  *
- * Copyright 2016 ArcticSand, Inc.
- * Author : Brian Dodge <bdodge at arcticsand.com>
+ * Copyright 2016-2019  pSemi, Inc.
+ * Author : Brian Dodge <bdodge at psemi.com>
  */
 
 #include <linux/backlight.h>
@@ -191,27 +191,46 @@ static void arcxcnn_parse_dt(struct arcxcnn *lp)
 	if (ret == 0)
 		lp->pdata->initial_brightness = prog_val;
 
-	ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);
+	ret = of_property_read_u32(node, "arctic,led-config-0", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->led_config_0 = (u8)prog_val;
 
-	ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);
+	ret = of_property_read_u32(node, "arctic,led-config-1", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->led_config_1 = (u8)prog_val;
 
-	ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);
+	ret = of_property_read_u32(node, "arctic,dim-freq", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->dim_freq = (u8)prog_val;
 
-	ret = of_property_read_u32(node, "arc,comp-config", &prog_val);
+	ret = of_property_read_u32(node, "arctic,comp-config", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node, "arc,comp-config", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->comp_config = (u8)prog_val;
 
-	ret = of_property_read_u32(node, "arc,filter-config", &prog_val);
+	ret = of_property_read_u32(node, "arctic,filter-config", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node,
+				"arc,filter-config", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->filter_config = (u8)prog_val;
 
-	ret = of_property_read_u32(node, "arc,trim-config", &prog_val);
+	ret = of_property_read_u32(node, "arctic,trim-config", &prog_val);
+	if (ret)
+		ret = of_property_read_u32(node, "arc,trim-config", &prog_val);
+
 	if (ret == 0)
 		lp->pdata->trim_config = (u8)prog_val;
 
@@ -381,6 +400,8 @@ static int arcxcnn_remove(struct i2c_client *cl)
 }
 
 static const struct of_device_id arcxcnn_dt_ids[] = {
+	{ .compatible = "arctic,arc2c0608" },
+	/* here to remain compatible with an older binding, do not use */
 	{ .compatible = "arc,arc2c0608" },
 	{ }
 };
@@ -404,5 +425,5 @@ static struct i2c_driver arcxcnn_driver = {
 module_i2c_driver(arcxcnn_driver);
 
 MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Brian Dodge <bdodge at arcticsand.com>");
+MODULE_AUTHOR("Brian Dodge <bdodge at psemi.com>");
 MODULE_DESCRIPTION("ARCXCNN Backlight driver");
-- 
2.7.4