drivers/net/mdio/mdio-mux-meson-g12a.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2019 Baylibre, SAS.
  * Author: Jerome Brunet <jbrunet@baylibre.com>
  */

 #include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/mdio-mux.h>
 #include <linux/module.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>

 #define ETH_PLL_STS		0x40
 #define ETH_PLL_CTL0		0x44
 #define  PLL_CTL0_LOCK_DIG	BIT(30)
 #define  PLL_CTL0_RST		BIT(29)
 #define  PLL_CTL0_EN		BIT(28)
 #define  PLL_CTL0_SEL		BIT(23)
 #define  PLL_CTL0_N		GENMASK(14, 10)
 #define  PLL_CTL0_M		GENMASK(8, 0)
 #define  PLL_LOCK_TIMEOUT	1000000
 #define  PLL_MUX_NUM_PARENT	2
 #define ETH_PLL_CTL1		0x48
 #define ETH_PLL_CTL2		0x4c
 #define ETH_PLL_CTL3		0x50
 #define ETH_PLL_CTL4		0x54
 #define ETH_PLL_CTL5		0x58
 #define ETH_PLL_CTL6		0x5c
 #define ETH_PLL_CTL7		0x60

 #define ETH_PHY_CNTL0		0x80
 #define   EPHY_G12A_ID		0x33010180
 #define ETH_PHY_CNTL1		0x84
 #define  PHY_CNTL1_ST_MODE	GENMASK(2, 0)
 #define  PHY_CNTL1_ST_PHYADD	GENMASK(7, 3)
 #define   EPHY_DFLT_ADD		8
 #define  PHY_CNTL1_MII_MODE	GENMASK(15, 14)
 #define   EPHY_MODE_RMII	0x1
 #define  PHY_CNTL1_CLK_EN	BIT(16)
 #define  PHY_CNTL1_CLKFREQ	BIT(17)
 #define  PHY_CNTL1_PHY_ENB	BIT(18)
 #define ETH_PHY_CNTL2		0x88
 #define  PHY_CNTL2_USE_INTERNAL	BIT(5)
 #define  PHY_CNTL2_SMI_SRC_MAC	BIT(6)
 #define  PHY_CNTL2_RX_CLK_EPHY	BIT(9)

 #define MESON_G12A_MDIO_EXTERNAL_ID 0
 #define MESON_G12A_MDIO_INTERNAL_ID 1

 struct g12a_mdio_mux {
 	void __iomem *regs;
 	void *mux_handle;
 	struct clk *pll;
 };

 struct g12a_ephy_pll {
 	void __iomem *base;
 	struct clk_hw hw;
 };

 #define g12a_ephy_pll_to_dev(_hw)			\
 	container_of(_hw, struct g12a_ephy_pll, hw)

 static unsigned long g12a_ephy_pll_recalc_rate(struct clk_hw *hw,
 					       unsigned long parent_rate)
 {
 	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
 	u32 val, m, n;

 	val = readl(pll->base + ETH_PLL_CTL0);
 	m = FIELD_GET(PLL_CTL0_M, val);
 	n = FIELD_GET(PLL_CTL0_N, val);

 	return parent_rate * m / n;
 }

 static int g12a_ephy_pll_enable(struct clk_hw *hw)
 {
 	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
 	u32 val = readl(pll->base + ETH_PLL_CTL0);

 	/* Apply both enable an reset */
 	val |= PLL_CTL0_RST | PLL_CTL0_EN;
 	writel(val, pll->base + ETH_PLL_CTL0);

 	/* Clear the reset to let PLL lock */
 	val &= ~PLL_CTL0_RST;
 	writel(val, pll->base + ETH_PLL_CTL0);

 	/* Poll on the digital lock instead of the usual analog lock
 	 * This is done because bit 31 is unreliable on some SoC. Bit
 	 * 31 may indicate that the PLL is not lock even though the clock
 	 * is actually running
 	 */
 	return readl_poll_timeout(pll->base + ETH_PLL_CTL0, val,
 				  val & PLL_CTL0_LOCK_DIG, 0, PLL_LOCK_TIMEOUT);
 }

 static void g12a_ephy_pll_disable(struct clk_hw *hw)
 {
 	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
 	u32 val;

 	val = readl(pll->base + ETH_PLL_CTL0);
 	val &= ~PLL_CTL0_EN;
 	val |= PLL_CTL0_RST;
 	writel(val, pll->base + ETH_PLL_CTL0);
 }

 static int g12a_ephy_pll_is_enabled(struct clk_hw *hw)
 {
 	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
 	unsigned int val;

 	val = readl(pll->base + ETH_PLL_CTL0);

 	return (val & PLL_CTL0_LOCK_DIG) ? 1 : 0;
 }

 static int g12a_ephy_pll_init(struct clk_hw *hw)
 {
 	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);

 	/* Apply PLL HW settings */
 	writel(0x29c0040a, pll->base + ETH_PLL_CTL0);
 	writel(0x927e0000, pll->base + ETH_PLL_CTL1);
 	writel(0xac5f49e5, pll->base + ETH_PLL_CTL2);
 	writel(0x00000000, pll->base + ETH_PLL_CTL3);
 	writel(0x00000000, pll->base + ETH_PLL_CTL4);
 	writel(0x20200000, pll->base + ETH_PLL_CTL5);
 	writel(0x0000c002, pll->base + ETH_PLL_CTL6);
 	writel(0x00000023, pll->base + ETH_PLL_CTL7);

 	return 0;
 }

 static const struct clk_ops g12a_ephy_pll_ops = {
 	.recalc_rate	= g12a_ephy_pll_recalc_rate,
 	.is_enabled	= g12a_ephy_pll_is_enabled,
 	.enable		= g12a_ephy_pll_enable,
 	.disable	= g12a_ephy_pll_disable,
 	.init		= g12a_ephy_pll_init,
 };

 static int g12a_enable_internal_mdio(struct g12a_mdio_mux *priv)
 {
 	u32 value;
 	int ret;

 	/* Enable the phy clock */
 	if (!__clk_is_enabled(priv->pll)) {
 		ret = clk_prepare_enable(priv->pll);
 		if (ret)
 			return ret;
 	}

 	/* Initialize ephy control */
 	writel(EPHY_G12A_ID, priv->regs + ETH_PHY_CNTL0);

 	/* Make sure we get a 0 -> 1 transition on the enable bit */
 	value = FIELD_PREP(PHY_CNTL1_ST_MODE, 3) |
 		FIELD_PREP(PHY_CNTL1_ST_PHYADD, EPHY_DFLT_ADD) |
 		FIELD_PREP(PHY_CNTL1_MII_MODE, EPHY_MODE_RMII) |
 		PHY_CNTL1_CLK_EN |
 		PHY_CNTL1_CLKFREQ;
 	writel(value, priv->regs + ETH_PHY_CNTL1);
 	writel(PHY_CNTL2_USE_INTERNAL |
 	       PHY_CNTL2_SMI_SRC_MAC |
 	       PHY_CNTL2_RX_CLK_EPHY,
 	       priv->regs + ETH_PHY_CNTL2);

 	value |= PHY_CNTL1_PHY_ENB;
 	writel(value, priv->regs + ETH_PHY_CNTL1);

 	/* The phy needs a bit of time to power up */
 	mdelay(10);

 	return 0;
 }

 static int g12a_enable_external_mdio(struct g12a_mdio_mux *priv)
 {
 	/* Reset the mdio bus mux */
 	writel_relaxed(0x0, priv->regs + ETH_PHY_CNTL2);

 	/* Disable the phy clock if enabled */
 	if (__clk_is_enabled(priv->pll))
 		clk_disable_unprepare(priv->pll);

 	return 0;
 }

 static int g12a_mdio_switch_fn(int current_child, int desired_child,
 			       void *data)
 {
 	struct g12a_mdio_mux *priv = dev_get_drvdata(data);

 	if (current_child == desired_child)
 		return 0;

 	switch (desired_child) {
 	case MESON_G12A_MDIO_EXTERNAL_ID:
 		return g12a_enable_external_mdio(priv);
 	case MESON_G12A_MDIO_INTERNAL_ID:
 		return g12a_enable_internal_mdio(priv);
 	default:
 		return -EINVAL;
 	}
 }

 static const struct of_device_id g12a_mdio_mux_match[] = {
 	{ .compatible = "amlogic,g12a-mdio-mux", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, g12a_mdio_mux_match);

 static int g12a_ephy_glue_clk_register(struct device *dev)
 {
 	struct g12a_mdio_mux *priv = dev_get_drvdata(dev);
 	const char *parent_names[PLL_MUX_NUM_PARENT];
 	struct clk_init_data init;
 	struct g12a_ephy_pll *pll;
 	struct clk_mux *mux;
 	struct clk *clk;
 	char *name;
 	int i;

 	/* get the mux parents */
 	for (i = 0; i < PLL_MUX_NUM_PARENT; i++) {
 		char in_name[8];

 		snprintf(in_name, sizeof(in_name), "clkin%d", i);
 		clk = devm_clk_get(dev, in_name);
 		if (IS_ERR(clk))
 			return dev_err_probe(dev, PTR_ERR(clk),
 					     "Missing clock %s\n", in_name);

 		parent_names[i] = __clk_get_name(clk);
 	}

 	/* create the input mux */
 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 	if (!mux)
 		return -ENOMEM;

 	name = kasprintf(GFP_KERNEL, "%s#mux", dev_name(dev));
 	if (!name)
 		return -ENOMEM;

 	init.name = name;
 	init.ops = &clk_mux_ro_ops;
 	init.flags = 0;
 	init.parent_names = parent_names;
 	init.num_parents = PLL_MUX_NUM_PARENT;

 	mux->reg = priv->regs + ETH_PLL_CTL0;
 	mux->shift = __ffs(PLL_CTL0_SEL);
 	mux->mask = PLL_CTL0_SEL >> mux->shift;
 	mux->hw.init = &init;

 	clk = devm_clk_register(dev, &mux->hw);
 	kfree(name);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to register input mux\n");
 		return PTR_ERR(clk);
 	}

 	/* create the pll */
 	pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
 	if (!pll)
 		return -ENOMEM;

 	name = kasprintf(GFP_KERNEL, "%s#pll", dev_name(dev));
 	if (!name)
 		return -ENOMEM;

 	init.name = name;
 	init.ops = &g12a_ephy_pll_ops;
 	init.flags = 0;
 	parent_names[0] = __clk_get_name(clk);
 	init.parent_names = parent_names;
 	init.num_parents = 1;

 	pll->base = priv->regs;
 	pll->hw.init = &init;

 	clk = devm_clk_register(dev, &pll->hw);
 	kfree(name);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to register input mux\n");
 		return PTR_ERR(clk);
 	}

 	priv->pll = clk;

 	return 0;
 }

 static int g12a_mdio_mux_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct g12a_mdio_mux *priv;
 	struct clk *pclk;
 	int ret;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, priv);

 	priv->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->regs))
 		return PTR_ERR(priv->regs);

 	pclk = devm_clk_get_enabled(dev, "pclk");
 	if (IS_ERR(pclk))
 		return dev_err_probe(dev, PTR_ERR(pclk),
 				     "failed to get peripheral clock\n");

 	/* Register PLL in CCF */
 	ret = g12a_ephy_glue_clk_register(dev);
 	if (ret)
 		return ret;

 	ret = mdio_mux_init(dev, dev->of_node, g12a_mdio_switch_fn,
 			    &priv->mux_handle, dev, NULL);
 	if (ret)
 		dev_err_probe(dev, ret, "mdio multiplexer init failed\n");

 	return ret;
 }

 static void g12a_mdio_mux_remove(struct platform_device *pdev)
 {
 	struct g12a_mdio_mux *priv = platform_get_drvdata(pdev);

 	mdio_mux_uninit(priv->mux_handle);

 	if (__clk_is_enabled(priv->pll))
 		clk_disable_unprepare(priv->pll);
 }

 static struct platform_driver g12a_mdio_mux_driver = {
 	.probe		= g12a_mdio_mux_probe,
 	.remove_new	= g12a_mdio_mux_remove,
 	.driver		= {
 		.name	= "g12a-mdio_mux",
 		.of_match_table = g12a_mdio_mux_match,
 	},
 };
 module_platform_driver(g12a_mdio_mux_driver);

 MODULE_DESCRIPTION("Amlogic G12a MDIO multiplexer driver");
 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/* Copyright (c) 2019 Baylibre, SAS.
	* Author: Jerome Brunet <jbrunet@baylibre.com>
	*/

	#include <linux/bitfield.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/device.h>
	#include <linux/io.h>
	#include <linux/iopoll.h>
	#include <linux/mdio-mux.h>
	#include <linux/module.h>
	#include <linux/phy.h>
	#include <linux/platform_device.h>

	#define ETH_PLL_STS 0x40
	#define ETH_PLL_CTL0 0x44
	#define PLL_CTL0_LOCK_DIG BIT(30)
	#define PLL_CTL0_RST BIT(29)
	#define PLL_CTL0_EN BIT(28)
	#define PLL_CTL0_SEL BIT(23)
	#define PLL_CTL0_N GENMASK(14, 10)
	#define PLL_CTL0_M GENMASK(8, 0)
	#define PLL_LOCK_TIMEOUT 1000000
	#define PLL_MUX_NUM_PARENT 2
	#define ETH_PLL_CTL1 0x48
	#define ETH_PLL_CTL2 0x4c
	#define ETH_PLL_CTL3 0x50
	#define ETH_PLL_CTL4 0x54
	#define ETH_PLL_CTL5 0x58
	#define ETH_PLL_CTL6 0x5c
	#define ETH_PLL_CTL7 0x60

	#define ETH_PHY_CNTL0 0x80
	#define EPHY_G12A_ID 0x33010180
	#define ETH_PHY_CNTL1 0x84
	#define PHY_CNTL1_ST_MODE GENMASK(2, 0)
	#define PHY_CNTL1_ST_PHYADD GENMASK(7, 3)
	#define EPHY_DFLT_ADD 8
	#define PHY_CNTL1_MII_MODE GENMASK(15, 14)
	#define EPHY_MODE_RMII 0x1
	#define PHY_CNTL1_CLK_EN BIT(16)
	#define PHY_CNTL1_CLKFREQ BIT(17)
	#define PHY_CNTL1_PHY_ENB BIT(18)
	#define ETH_PHY_CNTL2 0x88
	#define PHY_CNTL2_USE_INTERNAL BIT(5)
	#define PHY_CNTL2_SMI_SRC_MAC BIT(6)
	#define PHY_CNTL2_RX_CLK_EPHY BIT(9)

	#define MESON_G12A_MDIO_EXTERNAL_ID 0
	#define MESON_G12A_MDIO_INTERNAL_ID 1

	struct g12a_mdio_mux {
	void __iomem *regs;
	void *mux_handle;
	struct clk *pll;
	};

	struct g12a_ephy_pll {
	void __iomem *base;
	struct clk_hw hw;
	};

	#define g12a_ephy_pll_to_dev(_hw) \
	container_of(_hw, struct g12a_ephy_pll, hw)

	static unsigned long g12a_ephy_pll_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
	u32 val, m, n;

	val = readl(pll->base + ETH_PLL_CTL0);
	m = FIELD_GET(PLL_CTL0_M, val);
	n = FIELD_GET(PLL_CTL0_N, val);

	return parent_rate * m / n;
	}

	static int g12a_ephy_pll_enable(struct clk_hw *hw)
	{
	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
	u32 val = readl(pll->base + ETH_PLL_CTL0);

	/* Apply both enable an reset */
	val \|= PLL_CTL0_RST \| PLL_CTL0_EN;
	writel(val, pll->base + ETH_PLL_CTL0);

	/* Clear the reset to let PLL lock */
	val &= ~PLL_CTL0_RST;
	writel(val, pll->base + ETH_PLL_CTL0);

	/* Poll on the digital lock instead of the usual analog lock
	* This is done because bit 31 is unreliable on some SoC. Bit
	* 31 may indicate that the PLL is not lock even though the clock
	* is actually running
	*/
	return readl_poll_timeout(pll->base + ETH_PLL_CTL0, val,
	val & PLL_CTL0_LOCK_DIG, 0, PLL_LOCK_TIMEOUT);
	}

	static void g12a_ephy_pll_disable(struct clk_hw *hw)
	{
	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
	u32 val;

	val = readl(pll->base + ETH_PLL_CTL0);
	val &= ~PLL_CTL0_EN;
	val \|= PLL_CTL0_RST;
	writel(val, pll->base + ETH_PLL_CTL0);
	}

	static int g12a_ephy_pll_is_enabled(struct clk_hw *hw)
	{
	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
	unsigned int val;

	val = readl(pll->base + ETH_PLL_CTL0);

	return (val & PLL_CTL0_LOCK_DIG) ? 1 : 0;
	}

	static int g12a_ephy_pll_init(struct clk_hw *hw)
	{
	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);

	/* Apply PLL HW settings */
	writel(0x29c0040a, pll->base + ETH_PLL_CTL0);
	writel(0x927e0000, pll->base + ETH_PLL_CTL1);
	writel(0xac5f49e5, pll->base + ETH_PLL_CTL2);
	writel(0x00000000, pll->base + ETH_PLL_CTL3);
	writel(0x00000000, pll->base + ETH_PLL_CTL4);
	writel(0x20200000, pll->base + ETH_PLL_CTL5);
	writel(0x0000c002, pll->base + ETH_PLL_CTL6);
	writel(0x00000023, pll->base + ETH_PLL_CTL7);

	return 0;
	}

	static const struct clk_ops g12a_ephy_pll_ops = {
	.recalc_rate = g12a_ephy_pll_recalc_rate,
	.is_enabled = g12a_ephy_pll_is_enabled,
	.enable = g12a_ephy_pll_enable,
	.disable = g12a_ephy_pll_disable,
	.init = g12a_ephy_pll_init,
	};

	static int g12a_enable_internal_mdio(struct g12a_mdio_mux *priv)
	{
	u32 value;
	int ret;

	/* Enable the phy clock */
	if (!__clk_is_enabled(priv->pll)) {
	ret = clk_prepare_enable(priv->pll);
	if (ret)
	return ret;
	}

	/* Initialize ephy control */
	writel(EPHY_G12A_ID, priv->regs + ETH_PHY_CNTL0);

	/* Make sure we get a 0 -> 1 transition on the enable bit */
	value = FIELD_PREP(PHY_CNTL1_ST_MODE, 3) \|
	FIELD_PREP(PHY_CNTL1_ST_PHYADD, EPHY_DFLT_ADD) \|
	FIELD_PREP(PHY_CNTL1_MII_MODE, EPHY_MODE_RMII) \|
	PHY_CNTL1_CLK_EN \|
	PHY_CNTL1_CLKFREQ;
	writel(value, priv->regs + ETH_PHY_CNTL1);
	writel(PHY_CNTL2_USE_INTERNAL \|
	PHY_CNTL2_SMI_SRC_MAC \|
	PHY_CNTL2_RX_CLK_EPHY,
	priv->regs + ETH_PHY_CNTL2);

	value \|= PHY_CNTL1_PHY_ENB;
	writel(value, priv->regs + ETH_PHY_CNTL1);

	/* The phy needs a bit of time to power up */
	mdelay(10);

	return 0;
	}

	static int g12a_enable_external_mdio(struct g12a_mdio_mux *priv)
	{
	/* Reset the mdio bus mux */
	writel_relaxed(0x0, priv->regs + ETH_PHY_CNTL2);

	/* Disable the phy clock if enabled */
	if (__clk_is_enabled(priv->pll))
	clk_disable_unprepare(priv->pll);

	return 0;
	}

	static int g12a_mdio_switch_fn(int current_child, int desired_child,
	void *data)
	{
	struct g12a_mdio_mux *priv = dev_get_drvdata(data);

	if (current_child == desired_child)
	return 0;

	switch (desired_child) {
	case MESON_G12A_MDIO_EXTERNAL_ID:
	return g12a_enable_external_mdio(priv);
	case MESON_G12A_MDIO_INTERNAL_ID:
	return g12a_enable_internal_mdio(priv);
	default:
	return -EINVAL;
	}
	}

	static const struct of_device_id g12a_mdio_mux_match[] = {
	{ .compatible = "amlogic,g12a-mdio-mux", },
	{},
	};
	MODULE_DEVICE_TABLE(of, g12a_mdio_mux_match);

	static int g12a_ephy_glue_clk_register(struct device *dev)
	{
	struct g12a_mdio_mux *priv = dev_get_drvdata(dev);
	const char *parent_names[PLL_MUX_NUM_PARENT];
	struct clk_init_data init;
	struct g12a_ephy_pll *pll;
	struct clk_mux *mux;
	struct clk *clk;
	char *name;
	int i;

	/* get the mux parents */
	for (i = 0; i < PLL_MUX_NUM_PARENT; i++) {
	char in_name[8];

	snprintf(in_name, sizeof(in_name), "clkin%d", i);
	clk = devm_clk_get(dev, in_name);
	if (IS_ERR(clk))
	return dev_err_probe(dev, PTR_ERR(clk),
	"Missing clock %s\n", in_name);

	parent_names[i] = __clk_get_name(clk);
	}

	/* create the input mux */
	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
	if (!mux)
	return -ENOMEM;

	name = kasprintf(GFP_KERNEL, "%s#mux", dev_name(dev));
	if (!name)
	return -ENOMEM;

	init.name = name;
	init.ops = &clk_mux_ro_ops;
	init.flags = 0;
	init.parent_names = parent_names;
	init.num_parents = PLL_MUX_NUM_PARENT;

	mux->reg = priv->regs + ETH_PLL_CTL0;
	mux->shift = __ffs(PLL_CTL0_SEL);
	mux->mask = PLL_CTL0_SEL >> mux->shift;
	mux->hw.init = &init;

	clk = devm_clk_register(dev, &mux->hw);
	kfree(name);
	if (IS_ERR(clk)) {
	dev_err(dev, "failed to register input mux\n");
	return PTR_ERR(clk);
	}

	/* create the pll */
	pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
	if (!pll)
	return -ENOMEM;

	name = kasprintf(GFP_KERNEL, "%s#pll", dev_name(dev));
	if (!name)
	return -ENOMEM;

	init.name = name;
	init.ops = &g12a_ephy_pll_ops;
	init.flags = 0;
	parent_names[0] = __clk_get_name(clk);
	init.parent_names = parent_names;
	init.num_parents = 1;

	pll->base = priv->regs;
	pll->hw.init = &init;

	clk = devm_clk_register(dev, &pll->hw);
	kfree(name);
	if (IS_ERR(clk)) {
	dev_err(dev, "failed to register input mux\n");
	return PTR_ERR(clk);
	}

	priv->pll = clk;

	return 0;
	}

	static int g12a_mdio_mux_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct g12a_mdio_mux *priv;
	struct clk *pclk;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	platform_set_drvdata(pdev, priv);

	priv->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(priv->regs))
	return PTR_ERR(priv->regs);

	pclk = devm_clk_get_enabled(dev, "pclk");
	if (IS_ERR(pclk))
	return dev_err_probe(dev, PTR_ERR(pclk),
	"failed to get peripheral clock\n");

	/* Register PLL in CCF */
	ret = g12a_ephy_glue_clk_register(dev);
	if (ret)
	return ret;

	ret = mdio_mux_init(dev, dev->of_node, g12a_mdio_switch_fn,
	&priv->mux_handle, dev, NULL);
	if (ret)
	dev_err_probe(dev, ret, "mdio multiplexer init failed\n");

	return ret;
	}

	static void g12a_mdio_mux_remove(struct platform_device *pdev)
	{
	struct g12a_mdio_mux *priv = platform_get_drvdata(pdev);

	mdio_mux_uninit(priv->mux_handle);

	if (__clk_is_enabled(priv->pll))
	clk_disable_unprepare(priv->pll);
	}

	static struct platform_driver g12a_mdio_mux_driver = {
	.probe = g12a_mdio_mux_probe,
	.remove_new = g12a_mdio_mux_remove,
	.driver = {
	.name = "g12a-mdio_mux",
	.of_match_table = g12a_mdio_mux_match,
	},
	};
	module_platform_driver(g12a_mdio_mux_driver);

	MODULE_DESCRIPTION("Amlogic G12a MDIO multiplexer driver");
	MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
	MODULE_LICENSE("GPL v2");