netdev - [PATCH] drivers: net: phy: mdio-mux: Add support for Generic Mux controls

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Date:   Thu, 21 Feb 2019 13:00:44 +0000
From:   Pankaj Bansal <pankaj.bansal@....com>
To:     Leo Li <leoyang.li@....com>, Peter Rosin <peda@...ntia.se>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Pankaj Bansal <pankaj.bansal@....com>
Subject: [PATCH] drivers: net: phy: mdio-mux: Add support for Generic Mux
 controls

Add support for Generic Mux controls, when Mdio mux node is a consumer
of mux produced by some other device.

Signed-off-by: Pankaj Bansal <pankaj.bansal@....com>
---
 drivers/net/phy/Kconfig    |  1 +
 drivers/net/phy/mdio-mux.c | 81 ++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 3d187cd50eb0..e0e6b2b33d6d 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -47,6 +47,7 @@ config MDIO_BITBANG
 config MDIO_BUS_MUX
 	tristate
 	depends on OF_MDIO
+	select MULTIPLEXER
 	help
 	  This module provides a driver framework for MDIO bus
 	  multiplexers which connect one of several child MDIO busses
diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 0a86f1e4c02f..c49e4ae9c174 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -11,6 +11,7 @@
 #include <linux/of_mdio.h>
 #include <linux/device.h>
 #include <linux/module.h>
+#include <linux/mux/consumer.h>
 #include <linux/phy.h>
 
 #define DRV_DESCRIPTION "MDIO bus multiplexer driver"
@@ -35,6 +36,11 @@ struct mdio_mux_child_bus {
 	int bus_number;
 };
 
+struct mdio_mux_state {
+	struct mux_control *muxc;
+	void *mux_handle;
+};
+
 /*
  * The parent bus' lock is used to order access to the switch_fn.
  */
@@ -208,6 +214,81 @@ void mdio_mux_uninit(void *mux_handle)
 }
 EXPORT_SYMBOL_GPL(mdio_mux_uninit);
 
+static int mdio_mux_switch_fn(int current_child, int desired_child, void *data)
+{
+	struct platform_device *pdev;
+	struct mdio_mux_state *s;
+	int ret = 0;
+
+	pdev = (struct platform_device *)data;
+	s = (struct mdio_mux_state *)platform_get_drvdata(pdev);
+	if (current_child ^ desired_child) {
+		if (current_child != -1)
+			ret = mux_control_deselect(s->muxc);
+		if (ret)
+			return ret;
+
+		ret =  mux_control_select(s->muxc, desired_child);
+		if (!ret)
+			dev_dbg(&pdev->dev, "%s %d -> %d\n", __func__,
+				current_child, desired_child);
+	}
+
+	return ret;
+}
+
+static int mdio_mux_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mdio_mux_state *s;
+	int ret = 0;
+
+	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	s->muxc = devm_mux_control_get(dev, NULL);
+	if (IS_ERR(s->muxc)) {
+		ret = PTR_ERR(s->muxc);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get mux: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, s);
+
+	ret = mdio_mux_init(&pdev->dev, pdev->dev.of_node, mdio_mux_switch_fn,
+			    &s->mux_handle, pdev, NULL);
+
+	return ret;
+}
+
+static int mdio_mux_remove(struct platform_device *pdev)
+{
+	struct mdio_mux_state *s = platform_get_drvdata(pdev);
+
+	mdio_mux_uninit(s->mux_handle);
+
+	return 0;
+}
+
+static const struct of_device_id mdio_mux_match[] = {
+	{ .compatible = "mdio-mux", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mdio_mux_match);
+
+static struct platform_driver mdio_mux_driver = {
+	.driver = {
+		.name		= "mdio-mux",
+		.of_match_table	= mdio_mux_match,
+	},
+	.probe		= mdio_mux_probe,
+	.remove		= mdio_mux_remove,
+};
+
+module_platform_driver(mdio_mux_driver);
+
 MODULE_DESCRIPTION(DRV_DESCRIPTION);
 MODULE_AUTHOR("David Daney");
 MODULE_LICENSE("GPL");
-- 
2.17.1