[PATCH v1 05/11] leds: aw200xx: calculate dts property display_rows in driver

[Dmitry Rokosov]

From: George Stark <gnstark@xxxxxxxxxxxxxxxxx>

Get rid of device tree property "awinic,display-rows" and calculate it
in driver using led definition nodes. display-row actually means number
of current switches and depends on how leds are connected to the device.

Signed-off-by: George Stark <gnstark@xxxxxxxxxxxxxxxxx>
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
---
 drivers/leds/leds-aw200xx.c | 40 ++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index d92c082d4ab3..5b6907eb6299 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -383,6 +383,32 @@ static void aw200xx_disable(const struct aw200xx *const chip)
 		gpio_set_value(chip->hwen, 0);
 }
 
+static int aw200xx_probe_get_display_rows(struct device *dev, struct aw200xx *chip)
+{
+	struct fwnode_handle *child;
+	u32 max_source = 0;
+
+	device_for_each_child_node(dev, child) {
+		u32 source;
+		int ret;
+
+		ret = fwnode_property_read_u32(child, "reg", &source);
+		if (ret || source >= chip->cdef->channels)
+			continue;
+
+		if (max_source < source)
+			max_source = source;
+	}
+
+	chip->display_rows = max_source / chip->cdef->display_size_columns + 1;
+	if (!chip->display_rows) {
+		dev_err(dev, "No valid led definitions found\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip)
 {
 	struct fwnode_handle *child;
@@ -390,18 +416,8 @@ static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip)
 	int ret;
 	int i;
 
-	ret = device_property_read_u32(dev, "awinic,display-rows",
-				       &chip->display_rows);
-	if (ret)
-		return dev_err_probe(dev, ret,
-				     "Failed to read 'display-rows' property\n");
-
-	if (!chip->display_rows ||
-	    chip->display_rows > chip->cdef->display_size_rows_max) {
-		return dev_err_probe(dev, ret,
-				     "Invalid leds display size %u\n",
-				     chip->display_rows);
-	}
+	if (aw200xx_probe_get_display_rows(dev, chip))
+		return -EINVAL;
 
 	current_max = aw200xx_imax_from_global(chip, AW200XX_IMAX_MAX_uA);
 	current_min = aw200xx_imax_from_global(chip, AW200XX_IMAX_MIN_uA);
-- 
2.36.0