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From:   Dmitry Rokosov <ddrokosov@salutedevices.com>
To:     <lee@kernel.org>, <pavel@ucw.cz>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
        <andy.shevchenko@gmail.com>
CC:     <kernel@sberdevices.ru>, <rockosov@gmail.com>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-leds@vger.kernel.org>,
        George Stark <gnstark@salutedevices.com>,
        Dmitry Rokosov <ddrokosov@salutedevices.com>
Subject: [PATCH v2 04/11] leds: aw200xx: calculate dts property display_rows in driver
Date:   Wed, 18 Oct 2023 21:29:36 +0300
Message-ID: <20231018182943.18700-5-ddrokosov@salutedevices.com>
In-Reply-To: <20231018182943.18700-1-ddrokosov@salutedevices.com>
References: <20231018182943.18700-1-ddrokosov@salutedevices.com>
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From: George Stark <gnstark@salutedevices.com>

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@salutedevices.com>
Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
---
 drivers/leds/leds-aw200xx.c | 39 +++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index 911c3154585f..a2a31b8e623e 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -379,6 +379,31 @@ static void aw200xx_disable(const struct aw200xx *const chip)
 	return gpiod_set_value_cansleep(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;
+
+		max_source = max(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;
@@ -386,18 +411,8 @@ 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