netdev - [PATCH 6/6] net: sfp: add support for fwnode

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Date:   Fri, 18 Mar 2022 17:00:52 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "'Rafael J . Wysocki '" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, netdev@...r.kernel.org,
        Clément Léger <clement.leger@...tlin.com>
Subject: [PATCH 6/6] net: sfp: add support for fwnode

Add support to retrieve a i2c bus in sfp with a fwnode. This support
is using the fwnode API which also works with device-tree and ACPI.
For this purpose, the device-tree and ACPI code handling the i2c
adapter retrieval was factorized with the new code. This also allows
i2c devices using a software_node description to be used by sfp code.

Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 drivers/net/phy/sfp.c | 46 +++++++++++++------------------------------
 1 file changed, 14 insertions(+), 32 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 4720b24ca51b..3f57b1fbf413 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -2483,7 +2483,7 @@ static void sfp_cleanup(void *data)
 static int sfp_probe(struct platform_device *pdev)
 {
 	const struct sff_data *sff;
-	struct i2c_adapter *i2c;
+	struct i2c_adapter *i2c = NULL;
 	char *sfp_irq_name;
 	struct sfp *sfp;
 	int err, i;
@@ -2499,43 +2499,25 @@ static int sfp_probe(struct platform_device *pdev)
 		return err;
 
 	sff = sfp->type = &sfp_data;
+	if (dev_fwnode(&pdev->dev)) {
+		struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
+		struct fwnode_handle *np;
 
-	if (pdev->dev.of_node) {
-		struct device_node *node = pdev->dev.of_node;
-		const struct of_device_id *id;
-		struct device_node *np;
-
-		id = of_match_node(sfp_of_match, node);
-		if (WARN_ON(!id))
-			return -EINVAL;
+		if (!is_acpi_device_node(fwnode)) {
+			sff = device_get_match_data(&pdev->dev);
+			if (WARN_ON(!sff))
+				return -EINVAL;
 
-		sff = sfp->type = id->data;
-
-		np = of_parse_phandle(node, "i2c-bus", 0);
-		if (!np) {
-			dev_err(sfp->dev, "missing 'i2c-bus' property\n");
-			return -ENODEV;
+			sfp->type = sff;
 		}
 
-		i2c = of_find_i2c_adapter_by_node(np);
-		of_node_put(np);
-	} else if (has_acpi_companion(&pdev->dev)) {
-		struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
-		struct fwnode_handle *fw = acpi_fwnode_handle(adev);
-		struct fwnode_reference_args args;
-		struct acpi_handle *acpi_handle;
-		int ret;
-
-		ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
-		if (ret || !is_acpi_device_node(args.fwnode)) {
-			dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
+		np = fwnode_find_reference(fwnode, "i2c-bus", 0);
+		if (!np) {
+			dev_err(&pdev->dev, "Cannot parse i2c-bus\n");
 			return -ENODEV;
 		}
-
-		acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
-		i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
-	} else {
-		return -EINVAL;
+		i2c = fwnode_find_i2c_adapter_by_node(np);
+		fwnode_handle_put(np);
 	}
 
 	if (!i2c)
-- 
2.34.1