spi: cs42l43: Refactor accessing the SDCA extension properties

Refactor accessing the SDCA extension properties to make it easier to
access multiple properties to assist with future features. Return the
node itself and allow the caller to read the actual properties.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://msgid.link/r/20240611132556.1557075-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: charleskeepax

drivers/spi/spi-cs42l43.c

@@ -246,11 +246,10 @@ static size_t cs42l43_spi_max_length(struct spi_device *spi)
 	return CS42L43_SPI_MAX_LENGTH;
 }
 
-static bool cs42l43_has_sidecar(struct fwnode_handle *fwnode)
+static struct fwnode_handle *cs42l43_find_xu_node(struct fwnode_handle *fwnode)
 {
 	static const u32 func_smart_amp = 0x1;
 	struct fwnode_handle *child_fwnode, *ext_fwnode;
-	unsigned int val;
 	u32 function;
 	int ret;
 
@@ -266,21 +265,12 @@ static bool cs42l43_has_sidecar(struct fwnode_handle *fwnode)
 		if (!ext_fwnode)
 			continue;
 
-		ret = fwnode_property_read_u32(ext_fwnode,
-					       "01fa-sidecar-instances",
-					       &val);
-
-		fwnode_handle_put(ext_fwnode);
-
-		if (ret)
-			continue;
-
 		fwnode_handle_put(child_fwnode);
 
-		return !!val;
+		return ext_fwnode;
 	}
 
-	return false;
+	return NULL;
 }
 
 static void cs42l43_release_of_node(void *data)
@@ -298,7 +288,8 @@ static int cs42l43_spi_probe(struct platform_device *pdev)
 	struct cs42l43 *cs42l43 = dev_get_drvdata(pdev->dev.parent);
 	struct cs42l43_spi *priv;
 	struct fwnode_handle *fwnode = dev_fwnode(cs42l43->dev);
-	bool has_sidecar = cs42l43_has_sidecar(fwnode);
+	struct fwnode_handle *xu_fwnode __free(fwnode_handle) = cs42l43_find_xu_node(fwnode);
+	int nsidecars = 0;
 	int ret;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -350,7 +341,9 @@ static int cs42l43_spi_probe(struct platform_device *pdev)
 			return ret;
 	}
 
-	if (has_sidecar) {
+	fwnode_property_read_u32(xu_fwnode, "01fa-sidecar-instances", &nsidecars);
+
+	if (nsidecars) {
 		ret = software_node_register(&cs42l43_gpiochip_swnode);
 		if (ret)
 			return dev_err_probe(priv->dev, ret,
@@ -373,7 +366,7 @@ static int cs42l43_spi_probe(struct platform_device *pdev)
 		return dev_err_probe(priv->dev, ret,
 				     "Failed to register SPI controller\n");
 
-	if (has_sidecar) {
+	if (nsidecars) {
 		if (!spi_new_device(priv->ctlr, &ampl_info))
 			return dev_err_probe(priv->dev, -ENODEV,
 					     "Failed to create left amp slave\n");