power: reset: syscon-poweroff: Move device data into a struct

Currently all these device data elements are top level global variables.
Move these into a struct. This will be used in the next patch when
the global variable usage is removed. Doing this in two steps makes
the patches easier to read.
Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240212162831.67838-19-afd@ti.comSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/reset/syscon-poweroff.c

@@ -15,15 +15,19 @@
 #include <linux/pm.h>
 #include <linux/regmap.h>
 
-static struct regmap *map;
-static u32 offset;
-static u32 value;
-static u32 mask;
+struct syscon_poweroff_data {
+	struct regmap *map;
+	u32 offset;
+	u32 value;
+	u32 mask;
+};
+
+static struct syscon_poweroff_data *data;
 
 static void syscon_poweroff(void)
 {
 	/* Issue the poweroff */
-	regmap_update_bits(map, offset, mask, value);
+	regmap_update_bits(data->map, data->offset, data->mask, data->value);
 
 	mdelay(1000);
 
@@ -35,22 +39,26 @@ static int syscon_poweroff_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	int mask_err, value_err;
 
-	map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap");
-	if (IS_ERR(map)) {
-		map = syscon_node_to_regmap(dev->parent->of_node);
-		if (IS_ERR(map)) {
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap");
+	if (IS_ERR(data->map)) {
+		data->map = syscon_node_to_regmap(dev->parent->of_node);
+		if (IS_ERR(data->map)) {
 			dev_err(dev, "unable to get syscon");
-			return PTR_ERR(map);
+			return PTR_ERR(data->map);
 		}
 	}
 
-	if (of_property_read_u32(dev->of_node, "offset", &offset)) {
+	if (of_property_read_u32(dev->of_node, "offset", &data->offset)) {
 		dev_err(dev, "unable to read 'offset'");
 		return -EINVAL;
 	}
 
-	value_err = of_property_read_u32(dev->of_node, "value", &value);
-	mask_err = of_property_read_u32(dev->of_node, "mask", &mask);
+	value_err = of_property_read_u32(dev->of_node, "value", &data->value);
+	mask_err = of_property_read_u32(dev->of_node, "mask", &data->mask);
 	if (value_err && mask_err) {
 		dev_err(dev, "unable to read 'value' and 'mask'");
 		return -EINVAL;
@@ -58,11 +66,11 @@ static int syscon_poweroff_probe(struct platform_device *pdev)
 
 	if (value_err) {
 		/* support old binding */
-		value = mask;
-		mask = 0xFFFFFFFF;
+		data->value = data->mask;
+		data->mask = 0xFFFFFFFF;
 	} else if (mask_err) {
 		/* support value without mask*/
-		mask = 0xFFFFFFFF;
+		data->mask = 0xFFFFFFFF;
 	}
 
 	if (pm_power_off) {