netdev - [RFC 09/10] i2c: mux: add support for fwnode

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Date:   Mon, 21 Feb 2022 17:26:51 +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>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, netdev@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>
Subject: [RFC 09/10] i2c: mux: add support for fwnode

Modify i2c_mux_add_adapter() to use with fwnode API to allow creating
mux adapters with fwnode based devices. This allows to have a node
independent support for i2c muxes.

Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 drivers/i2c/i2c-mux.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 774507b54b57..93c916220da5 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -24,7 +24,7 @@
 #include <linux/i2c-mux.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 
@@ -347,38 +347,35 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
 	else
 		priv->adap.class = class;
 
-	/*
-	 * Try to populate the mux adapter's of_node, expands to
-	 * nothing if !CONFIG_OF.
-	 */
-	if (muxc->dev->of_node) {
-		struct device_node *dev_node = muxc->dev->of_node;
-		struct device_node *mux_node, *child = NULL;
+	/* Try to populate the mux adapter's device node */
+	if (dev_fwnode(muxc->dev) && !has_acpi_companion(muxc->dev)) {
+		struct fwnode_handle *dev_node = dev_fwnode(muxc->dev);
+		struct fwnode_handle *mux_node, *child = NULL;
 		u32 reg;
 
 		if (muxc->arbitrator)
-			mux_node = of_get_child_by_name(dev_node, "i2c-arb");
+			mux_node = fwnode_get_named_child_node(dev_node, "i2c-arb");
 		else if (muxc->gate)
-			mux_node = of_get_child_by_name(dev_node, "i2c-gate");
+			mux_node = fwnode_get_named_child_node(dev_node, "i2c-gate");
 		else
-			mux_node = of_get_child_by_name(dev_node, "i2c-mux");
+			mux_node = fwnode_get_named_child_node(dev_node, "i2c-mux");
 
 		if (mux_node) {
 			/* A "reg" property indicates an old-style DT entry */
-			if (!of_property_read_u32(mux_node, "reg", &reg)) {
-				of_node_put(mux_node);
+			if (!fwnode_property_read_u32(mux_node, "reg", &reg)) {
+				fwnode_handle_put(mux_node);
 				mux_node = NULL;
 			}
 		}
 
 		if (!mux_node)
-			mux_node = of_node_get(dev_node);
+			mux_node = fwnode_handle_get(dev_node);
 		else if (muxc->arbitrator || muxc->gate)
-			child = of_node_get(mux_node);
+			child = fwnode_handle_get(mux_node);
 
 		if (!child) {
-			for_each_child_of_node(mux_node, child) {
-				ret = of_property_read_u32(child, "reg", &reg);
+			fwnode_for_each_child_node(mux_node, child) {
+				ret = fwnode_property_read_u32(child, "reg", &reg);
 				if (ret)
 					continue;
 				if (chan_id == reg)
@@ -386,8 +383,8 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
 			}
 		}
 
-		priv->adap.dev.of_node = child;
-		of_node_put(mux_node);
+		device_set_node(&priv->adap.dev, child);
+		fwnode_handle_put(mux_node);
 	}
 
 	/*
@@ -444,7 +441,7 @@ void i2c_mux_del_adapters(struct i2c_mux_core *muxc)
 	while (muxc->num_adapters) {
 		struct i2c_adapter *adap = muxc->adapter[--muxc->num_adapters];
 		struct i2c_mux_priv *priv = adap->algo_data;
-		struct device_node *np = adap->dev.of_node;
+		struct fwnode_handle *np = dev_fwnode(&adap->dev);
 
 		muxc->adapter[muxc->num_adapters] = NULL;
 
@@ -454,7 +451,7 @@ void i2c_mux_del_adapters(struct i2c_mux_core *muxc)
 
 		sysfs_remove_link(&priv->adap.dev.kobj, "mux_device");
 		i2c_del_adapter(adap);
-		of_node_put(np);
+		fwnode_handle_put(np);
 		kfree(priv);
 	}
 }
-- 
2.34.1