drivers/clk/mpc83xx_clk.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2017
  * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
  */

 #include <common.h>
 #include <clk-uclass.h>
 #include <clock_legacy.h>
 #include <command.h>
 #include <dm.h>
 #include <vsprintf.h>
 #include <dm/lists.h>
 #include <dt-bindings/clk/mpc83xx-clk.h>
 #include <asm/arch/soc.h>

 #include "mpc83xx_clk.h"

 DECLARE_GLOBAL_DATA_PTR;

 /**
  * struct mpc83xx_clk_priv - Private data structure for the MPC83xx clock
  *			     driver
  * @speed: Array containing the speed values of all system clocks (initialized
  *	   once, then only read back)
  */
 struct mpc83xx_clk_priv {
 	u32 speed[MPC83XX_CLK_COUNT];
 };

 /**
  * is_clk_valid() - Check if clock ID is valid for given clock device
  * @clk: The clock device for which to check a clock ID
  * @id:  The clock ID to check
  *
  * Return: true if clock ID is valid for clock device, false if not
  */
 static inline bool is_clk_valid(struct udevice *clk, int id)
 {
 	ulong type = dev_get_driver_data(clk);

 	switch (id) {
 	case MPC83XX_CLK_MEM:
 		return true;
 	case MPC83XX_CLK_MEM_SEC:
 		return type == SOC_MPC8360;
 	case MPC83XX_CLK_ENC:
 		return (type == SOC_MPC8308) || (type == SOC_MPC8309);
 	case MPC83XX_CLK_I2C1:
 		return true;
 	case MPC83XX_CLK_TDM:
 		return type == SOC_MPC8315;
 	case MPC83XX_CLK_SDHC:
 		return mpc83xx_has_sdhc(type);
 	case MPC83XX_CLK_TSEC1:
 	case MPC83XX_CLK_TSEC2:
 		return mpc83xx_has_tsec(type);
 	case MPC83XX_CLK_USBDR:
 		return type == SOC_MPC8360;
 	case MPC83XX_CLK_USBMPH:
 		return type == SOC_MPC8349;
 	case MPC83XX_CLK_PCIEXP1:
 		return mpc83xx_has_pcie1(type);
 	case MPC83XX_CLK_PCIEXP2:
 		return mpc83xx_has_pcie2(type);
 	case MPC83XX_CLK_SATA:
 		return mpc83xx_has_sata(type);
 	case MPC83XX_CLK_DMAC:
 		return (type == SOC_MPC8308) || (type == SOC_MPC8309);
 	case MPC83XX_CLK_PCI:
 		/*
 		 * FIXME: implement proper support for this.
 		 */
 		return 0 && mpc83xx_has_pci(type);
 	case MPC83XX_CLK_CSB:
 		return true;
 	case MPC83XX_CLK_I2C2:
 		return mpc83xx_has_second_i2c(type);
 	case MPC83XX_CLK_QE:
 	case MPC83XX_CLK_BRG:
 		return mpc83xx_has_quicc_engine(type) && (type != SOC_MPC8309);
 	case MPC83XX_CLK_LCLK:
 	case MPC83XX_CLK_LBIU:
 	case MPC83XX_CLK_CORE:
 		return true;
 	}

 	return false;
 }

 /**
  * init_single_clk() - Initialize a clock with a given ID
  * @dev: The clock device for which to initialize the clock
  * @clk: The clock ID
  *
  * The clock speed is read from the hardware's registers, and stored in the
  * private data structure of the driver. From there it is only retrieved, and
  * not set.
  *
  * Return: 0 if OK, -ve on error
  */
 static int init_single_clk(struct udevice *dev, int clk)
 {
 	struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
 	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 	ulong type = dev_get_driver_data(dev);
 	struct clk_mode mode;
 	ulong mask;
 	u32 csb_clk = get_csb_clk(im);
 	int ret;

 	ret = retrieve_mode(clk, type, &mode);
 	if (ret) {
 		debug("%s: Could not retrieve mode for clk %d (ret = %d)\n",
 		      dev->name, clk, ret);
 		return ret;
 	}

 	if (mode.type == TYPE_INVALID) {
 		debug("%s: clock %d invalid\n", dev->name, clk);
 		return -EINVAL;
 	}

 	if (mode.type == TYPE_SCCR_STANDARD) {
 		mask = GENMASK(31 - mode.low, 31 - mode.high);

 		switch (sccr_field(im, mask)) {
 		case 0:
 			priv->speed[clk] = 0;
 			break;
 		case 1:
 			priv->speed[clk] = csb_clk;
 			break;
 		case 2:
 			priv->speed[clk] = csb_clk / 2;
 			break;
 		case 3:
 			priv->speed[clk] = csb_clk / 3;
 			break;
 		default:
 			priv->speed[clk] = 0;
 		}

 		return 0;
 	}

 	if (mode.type == TYPE_SPMR_DIRECT_MULTIPLY) {
 		mask = GENMASK(31 - mode.low, 31 - mode.high);

 		priv->speed[clk] = csb_clk * (1 + sccr_field(im, mask));
 		return 0;
 	}

 	if (clk == MPC83XX_CLK_CSB || clk == MPC83XX_CLK_I2C2) {
 		priv->speed[clk] = csb_clk; /* i2c-2 clk is equal to csb clk */
 		return 0;
 	}

 	if (clk == MPC83XX_CLK_QE || clk == MPC83XX_CLK_BRG) {
 		u32 pci_sync_in = get_pci_sync_in(im);
 		u32 qepmf = spmr_field(im, SPMR_CEPMF);
 		u32 qepdf = spmr_field(im, SPMR_CEPDF);
 		u32 qe_clk = (pci_sync_in * qepmf) / (1 + qepdf);

 		if (clk == MPC83XX_CLK_QE)
 			priv->speed[clk] = qe_clk;
 		else
 			priv->speed[clk] = qe_clk / 2;

 		return 0;
 	}

 	if (clk == MPC83XX_CLK_LCLK || clk == MPC83XX_CLK_LBIU) {
 		u32 lbiu_clk = csb_clk *
 			(1 + spmr_field(im, SPMR_LBIUCM));
 		u32 clkdiv = lcrr_field(im, LCRR_CLKDIV);

 		if (clk == MPC83XX_CLK_LBIU)
 			priv->speed[clk] = lbiu_clk;

 		switch (clkdiv) {
 		case 2:
 		case 4:
 		case 8:
 			priv->speed[clk] = lbiu_clk / clkdiv;
 			break;
 		default:
 			/* unknown lcrr */
 			priv->speed[clk] = 0;
 		}

 		return 0;
 	}

 	if (clk == MPC83XX_CLK_CORE) {
 		u8 corepll = spmr_field(im, SPMR_COREPLL);
 		u32 corecnf_tab_index = ((corepll & 0x1F) << 2) |
 					((corepll & 0x60) >> 5);

 		if (corecnf_tab_index > (ARRAY_SIZE(corecnf_tab))) {
 			debug("%s: Core configuration index %02x too high; possible wrong value",
 			      dev->name, corecnf_tab_index);
 			return -EINVAL;
 		}

 		switch (corecnf_tab[corecnf_tab_index].core_csb_ratio) {
 		case RAT_BYP:
 		case RAT_1_TO_1:
 			priv->speed[clk] = csb_clk;
 			break;
 		case RAT_1_5_TO_1:
 			priv->speed[clk] = (3 * csb_clk) / 2;
 			break;
 		case RAT_2_TO_1:
 			priv->speed[clk] = 2 * csb_clk;
 			break;
 		case RAT_2_5_TO_1:
 			priv->speed[clk] = (5 * csb_clk) / 2;
 			break;
 		case RAT_3_TO_1:
 			priv->speed[clk] = 3 * csb_clk;
 			break;
 		default:
 			/* unknown core to csb ratio */
 			priv->speed[clk] = 0;
 		}

 		return 0;
 	}

 	/* Unknown clk value -> error */
 	debug("%s: clock %d invalid\n", dev->name, clk);
 	return -EINVAL;
 }

 /**
  * init_all_clks() - Initialize all clocks of a clock device
  * @dev: The clock device whose clocks should be initialized
  *
  * Return: 0 if OK, -ve on error
  */
 static inline int init_all_clks(struct udevice *dev)
 {
 	int i;

 	for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
 		int ret;

 		if (!is_clk_valid(dev, i))
 			continue;

 		ret = init_single_clk(dev, i);
 		if (ret) {
 			debug("%s: Failed to initialize %s clock\n",
 			      dev->name, names[i]);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int mpc83xx_clk_request(struct clk *clock)
 {
 	/* Reject requests of clocks that are not available */
 	if (is_clk_valid(clock->dev, clock->id))
 		return 0;
 	else
 		return -ENODEV;
 }

 static ulong mpc83xx_clk_get_rate(struct clk *clk)
 {
 	struct mpc83xx_clk_priv *priv = dev_get_priv(clk->dev);

 	if (clk->id >= MPC83XX_CLK_COUNT) {
 		debug("%s: clock index %lu invalid\n", __func__, clk->id);
 		return 0;
 	}

 	return priv->speed[clk->id];
 }

 static int mpc83xx_clk_enable(struct clk *clk)
 {
 	/* MPC83xx clocks are always enabled */
 	return 0;
 }

 int get_clocks(void)
 {
 	/* Empty implementation to keep the prototype in common.h happy */
 	return 0;
 }

 int get_serial_clock(void)
 {
 	struct mpc83xx_clk_priv *priv;
 	struct udevice *clk;
 	int ret;

 	ret = uclass_first_device_err(UCLASS_CLK, &clk);
 	if (ret) {
 		debug("%s: Could not get clock device\n", __func__);
 		return ret;
 	}

 	priv = dev_get_priv(clk);

 	return priv->speed[MPC83XX_CLK_CSB];
 }

 const struct clk_ops mpc83xx_clk_ops = {
 	.request = mpc83xx_clk_request,
 	.get_rate = mpc83xx_clk_get_rate,
 	.enable = mpc83xx_clk_enable,
 };

 static const struct udevice_id mpc83xx_clk_match[] = {
 	{ .compatible = "fsl,mpc8308-clk", .data = SOC_MPC8308 },
 	{ .compatible = "fsl,mpc8309-clk", .data = SOC_MPC8309 },
 	{ .compatible = "fsl,mpc8313-clk", .data = SOC_MPC8313 },
 	{ .compatible = "fsl,mpc8315-clk", .data = SOC_MPC8315 },
 	{ .compatible = "fsl,mpc832x-clk", .data = SOC_MPC832X },
 	{ .compatible = "fsl,mpc8349-clk", .data = SOC_MPC8349 },
 	{ .compatible = "fsl,mpc8360-clk", .data = SOC_MPC8360 },
 	{ .compatible = "fsl,mpc8379-clk", .data = SOC_MPC8379 },
 	{ /* sentinel */ }
 };

 static int mpc83xx_clk_probe(struct udevice *dev)
 {
 	struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
 	ulong type;
 	int ret;

 	ret = init_all_clks(dev);
 	if (ret) {
 		debug("%s: Could not initialize all clocks (ret = %d)\n",
 		      dev->name, ret);
 		return ret;
 	}

 	type = dev_get_driver_data(dev);

 	if (mpc83xx_has_sdhc(type))
 		gd->arch.sdhc_clk = priv->speed[MPC83XX_CLK_SDHC];

 	gd->arch.core_clk = priv->speed[MPC83XX_CLK_CORE];
 	gd->arch.i2c1_clk = priv->speed[MPC83XX_CLK_I2C1];
 	if (mpc83xx_has_second_i2c(type))
 		gd->arch.i2c2_clk = priv->speed[MPC83XX_CLK_I2C2];

 	gd->mem_clk = priv->speed[MPC83XX_CLK_MEM];

 	if (mpc83xx_has_pci(type))
 		gd->pci_clk = priv->speed[MPC83XX_CLK_PCI];

 	gd->cpu_clk = priv->speed[MPC83XX_CLK_CORE];
 	gd->bus_clk = priv->speed[MPC83XX_CLK_CSB];

 	return 0;
 }

 static int mpc83xx_clk_bind(struct udevice *dev)
 {
 	int ret;
 	struct udevice *sys_child;

 	/*
 	 * Since there is no corresponding device tree entry, and since the
 	 * clock driver has to be present in either case, bind the sysreset
 	 * driver here.
 	 */
 	ret = device_bind_driver(dev, "mpc83xx_sysreset", "sysreset",
 				 &sys_child);
 	if (ret)
 		debug("%s: No sysreset driver: ret=%d\n",
 		      dev->name, ret);

 	return 0;
 }

 U_BOOT_DRIVER(mpc83xx_clk) = {
 	.name = "mpc83xx_clk",
 	.id = UCLASS_CLK,
 	.of_match = mpc83xx_clk_match,
 	.ops = &mpc83xx_clk_ops,
 	.probe = mpc83xx_clk_probe,
 	.priv_auto_alloc_size	= sizeof(struct mpc83xx_clk_priv),
 	.bind = mpc83xx_clk_bind,
 };

 static int do_clocks(struct cmd_tbl *cmdtp, int flag, int argc,
 		     char *const argv[])
 {
 	int i;
 	char buf[32];
 	struct udevice *clk;
 	int ret;
 	struct mpc83xx_clk_priv *priv;

 	ret = uclass_first_device_err(UCLASS_CLK, &clk);
 	if (ret) {
 		debug("%s: Could not get clock device\n", __func__);
 		return ret;
 	}

 	for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
 		if (!is_clk_valid(clk, i))
 			continue;

 		priv = dev_get_priv(clk);

 		printf("%s = %s MHz\n", names[i], strmhz(buf, priv->speed[i]));
 	}

 	return 0;
 }

 U_BOOT_CMD(clocks,	1,	1,	do_clocks,
 	   "display values of SoC's clocks",
 	   ""
 );
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2017
	* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
	*/

	#include <common.h>
	#include <clk-uclass.h>
	#include <clock_legacy.h>
	#include <command.h>
	#include <dm.h>
	#include <vsprintf.h>
	#include <dm/lists.h>
	#include <dt-bindings/clk/mpc83xx-clk.h>
	#include <asm/arch/soc.h>

	#include "mpc83xx_clk.h"

	DECLARE_GLOBAL_DATA_PTR;

	/**
	* struct mpc83xx_clk_priv - Private data structure for the MPC83xx clock
	* driver
	* @speed: Array containing the speed values of all system clocks (initialized
	* once, then only read back)
	*/
	struct mpc83xx_clk_priv {
	u32 speed[MPC83XX_CLK_COUNT];
	};

	/**
	* is_clk_valid() - Check if clock ID is valid for given clock device
	* @clk: The clock device for which to check a clock ID
	* @id: The clock ID to check
	*
	* Return: true if clock ID is valid for clock device, false if not
	*/
	static inline bool is_clk_valid(struct udevice *clk, int id)
	{
	ulong type = dev_get_driver_data(clk);

	switch (id) {
	case MPC83XX_CLK_MEM:
	return true;
	case MPC83XX_CLK_MEM_SEC:
	return type == SOC_MPC8360;
	case MPC83XX_CLK_ENC:
	return (type == SOC_MPC8308) \|\| (type == SOC_MPC8309);
	case MPC83XX_CLK_I2C1:
	return true;
	case MPC83XX_CLK_TDM:
	return type == SOC_MPC8315;
	case MPC83XX_CLK_SDHC:
	return mpc83xx_has_sdhc(type);
	case MPC83XX_CLK_TSEC1:
	case MPC83XX_CLK_TSEC2:
	return mpc83xx_has_tsec(type);
	case MPC83XX_CLK_USBDR:
	return type == SOC_MPC8360;
	case MPC83XX_CLK_USBMPH:
	return type == SOC_MPC8349;
	case MPC83XX_CLK_PCIEXP1:
	return mpc83xx_has_pcie1(type);
	case MPC83XX_CLK_PCIEXP2:
	return mpc83xx_has_pcie2(type);
	case MPC83XX_CLK_SATA:
	return mpc83xx_has_sata(type);
	case MPC83XX_CLK_DMAC:
	return (type == SOC_MPC8308) \|\| (type == SOC_MPC8309);
	case MPC83XX_CLK_PCI:
	/*
	* FIXME: implement proper support for this.
	*/
	return 0 && mpc83xx_has_pci(type);
	case MPC83XX_CLK_CSB:
	return true;
	case MPC83XX_CLK_I2C2:
	return mpc83xx_has_second_i2c(type);
	case MPC83XX_CLK_QE:
	case MPC83XX_CLK_BRG:
	return mpc83xx_has_quicc_engine(type) && (type != SOC_MPC8309);
	case MPC83XX_CLK_LCLK:
	case MPC83XX_CLK_LBIU:
	case MPC83XX_CLK_CORE:
	return true;
	}

	return false;
	}

	/**
	* init_single_clk() - Initialize a clock with a given ID
	* @dev: The clock device for which to initialize the clock
	* @clk: The clock ID
	*
	* The clock speed is read from the hardware's registers, and stored in the
	* private data structure of the driver. From there it is only retrieved, and
	* not set.
	*
	* Return: 0 if OK, -ve on error
	*/
	static int init_single_clk(struct udevice *dev, int clk)
	{
	struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
	immap_t im = (immap_t )CONFIG_SYS_IMMR;
	ulong type = dev_get_driver_data(dev);
	struct clk_mode mode;
	ulong mask;
	u32 csb_clk = get_csb_clk(im);
	int ret;

	ret = retrieve_mode(clk, type, &mode);
	if (ret) {
	debug("%s: Could not retrieve mode for clk %d (ret = %d)\n",
	dev->name, clk, ret);
	return ret;
	}

	if (mode.type == TYPE_INVALID) {
	debug("%s: clock %d invalid\n", dev->name, clk);
	return -EINVAL;
	}

	if (mode.type == TYPE_SCCR_STANDARD) {
	mask = GENMASK(31 - mode.low, 31 - mode.high);

	switch (sccr_field(im, mask)) {
	case 0:
	priv->speed[clk] = 0;
	break;
	case 1:
	priv->speed[clk] = csb_clk;
	break;
	case 2:
	priv->speed[clk] = csb_clk / 2;
	break;
	case 3:
	priv->speed[clk] = csb_clk / 3;
	break;
	default:
	priv->speed[clk] = 0;
	}

	return 0;
	}

	if (mode.type == TYPE_SPMR_DIRECT_MULTIPLY) {
	mask = GENMASK(31 - mode.low, 31 - mode.high);

	priv->speed[clk] = csb_clk * (1 + sccr_field(im, mask));
	return 0;
	}

	if (clk == MPC83XX_CLK_CSB \|\| clk == MPC83XX_CLK_I2C2) {
	priv->speed[clk] = csb_clk; /* i2c-2 clk is equal to csb clk */
	return 0;
	}

	if (clk == MPC83XX_CLK_QE \|\| clk == MPC83XX_CLK_BRG) {
	u32 pci_sync_in = get_pci_sync_in(im);
	u32 qepmf = spmr_field(im, SPMR_CEPMF);
	u32 qepdf = spmr_field(im, SPMR_CEPDF);
	u32 qe_clk = (pci_sync_in * qepmf) / (1 + qepdf);

	if (clk == MPC83XX_CLK_QE)
	priv->speed[clk] = qe_clk;
	else
	priv->speed[clk] = qe_clk / 2;

	return 0;
	}

	if (clk == MPC83XX_CLK_LCLK \|\| clk == MPC83XX_CLK_LBIU) {
	u32 lbiu_clk = csb_clk *
	(1 + spmr_field(im, SPMR_LBIUCM));
	u32 clkdiv = lcrr_field(im, LCRR_CLKDIV);

	if (clk == MPC83XX_CLK_LBIU)
	priv->speed[clk] = lbiu_clk;

	switch (clkdiv) {
	case 2:
	case 4:
	case 8:
	priv->speed[clk] = lbiu_clk / clkdiv;
	break;
	default:
	/* unknown lcrr */
	priv->speed[clk] = 0;
	}

	return 0;
	}

	if (clk == MPC83XX_CLK_CORE) {
	u8 corepll = spmr_field(im, SPMR_COREPLL);
	u32 corecnf_tab_index = ((corepll & 0x1F) << 2) \|
	((corepll & 0x60) >> 5);

	if (corecnf_tab_index > (ARRAY_SIZE(corecnf_tab))) {
	debug("%s: Core configuration index %02x too high; possible wrong value",
	dev->name, corecnf_tab_index);
	return -EINVAL;
	}

	switch (corecnf_tab[corecnf_tab_index].core_csb_ratio) {
	case RAT_BYP:
	case RAT_1_TO_1:
	priv->speed[clk] = csb_clk;
	break;
	case RAT_1_5_TO_1:
	priv->speed[clk] = (3 * csb_clk) / 2;
	break;
	case RAT_2_TO_1:
	priv->speed[clk] = 2 * csb_clk;
	break;
	case RAT_2_5_TO_1:
	priv->speed[clk] = (5 * csb_clk) / 2;
	break;
	case RAT_3_TO_1:
	priv->speed[clk] = 3 * csb_clk;
	break;
	default:
	/* unknown core to csb ratio */
	priv->speed[clk] = 0;
	}

	return 0;
	}

	/* Unknown clk value -> error */
	debug("%s: clock %d invalid\n", dev->name, clk);
	return -EINVAL;
	}

	/**
	* init_all_clks() - Initialize all clocks of a clock device
	* @dev: The clock device whose clocks should be initialized
	*
	* Return: 0 if OK, -ve on error
	*/
	static inline int init_all_clks(struct udevice *dev)
	{
	int i;

	for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
	int ret;

	if (!is_clk_valid(dev, i))
	continue;

	ret = init_single_clk(dev, i);
	if (ret) {
	debug("%s: Failed to initialize %s clock\n",
	dev->name, names[i]);
	return ret;
	}
	}

	return 0;
	}

	static int mpc83xx_clk_request(struct clk *clock)
	{
	/* Reject requests of clocks that are not available */
	if (is_clk_valid(clock->dev, clock->id))
	return 0;
	else
	return -ENODEV;
	}

	static ulong mpc83xx_clk_get_rate(struct clk *clk)
	{
	struct mpc83xx_clk_priv *priv = dev_get_priv(clk->dev);

	if (clk->id >= MPC83XX_CLK_COUNT) {
	debug("%s: clock index %lu invalid\n", __func__, clk->id);
	return 0;
	}

	return priv->speed[clk->id];
	}

	static int mpc83xx_clk_enable(struct clk *clk)
	{
	/* MPC83xx clocks are always enabled */
	return 0;
	}

	int get_clocks(void)
	{
	/* Empty implementation to keep the prototype in common.h happy */
	return 0;
	}

	int get_serial_clock(void)
	{
	struct mpc83xx_clk_priv *priv;
	struct udevice *clk;
	int ret;

	ret = uclass_first_device_err(UCLASS_CLK, &clk);
	if (ret) {
	debug("%s: Could not get clock device\n", __func__);
	return ret;
	}

	priv = dev_get_priv(clk);

	return priv->speed[MPC83XX_CLK_CSB];
	}

	const struct clk_ops mpc83xx_clk_ops = {
	.request = mpc83xx_clk_request,
	.get_rate = mpc83xx_clk_get_rate,
	.enable = mpc83xx_clk_enable,
	};

	static const struct udevice_id mpc83xx_clk_match[] = {
	{ .compatible = "fsl,mpc8308-clk", .data = SOC_MPC8308 },
	{ .compatible = "fsl,mpc8309-clk", .data = SOC_MPC8309 },
	{ .compatible = "fsl,mpc8313-clk", .data = SOC_MPC8313 },
	{ .compatible = "fsl,mpc8315-clk", .data = SOC_MPC8315 },
	{ .compatible = "fsl,mpc832x-clk", .data = SOC_MPC832X },
	{ .compatible = "fsl,mpc8349-clk", .data = SOC_MPC8349 },
	{ .compatible = "fsl,mpc8360-clk", .data = SOC_MPC8360 },
	{ .compatible = "fsl,mpc8379-clk", .data = SOC_MPC8379 },
	{ /* sentinel */ }
	};

	static int mpc83xx_clk_probe(struct udevice *dev)
	{
	struct mpc83xx_clk_priv *priv = dev_get_priv(dev);
	ulong type;
	int ret;

	ret = init_all_clks(dev);
	if (ret) {
	debug("%s: Could not initialize all clocks (ret = %d)\n",
	dev->name, ret);
	return ret;
	}

	type = dev_get_driver_data(dev);

	if (mpc83xx_has_sdhc(type))
	gd->arch.sdhc_clk = priv->speed[MPC83XX_CLK_SDHC];

	gd->arch.core_clk = priv->speed[MPC83XX_CLK_CORE];
	gd->arch.i2c1_clk = priv->speed[MPC83XX_CLK_I2C1];
	if (mpc83xx_has_second_i2c(type))
	gd->arch.i2c2_clk = priv->speed[MPC83XX_CLK_I2C2];

	gd->mem_clk = priv->speed[MPC83XX_CLK_MEM];

	if (mpc83xx_has_pci(type))
	gd->pci_clk = priv->speed[MPC83XX_CLK_PCI];

	gd->cpu_clk = priv->speed[MPC83XX_CLK_CORE];
	gd->bus_clk = priv->speed[MPC83XX_CLK_CSB];

	return 0;
	}

	static int mpc83xx_clk_bind(struct udevice *dev)
	{
	int ret;
	struct udevice *sys_child;

	/*
	* Since there is no corresponding device tree entry, and since the
	* clock driver has to be present in either case, bind the sysreset
	* driver here.
	*/
	ret = device_bind_driver(dev, "mpc83xx_sysreset", "sysreset",
	&sys_child);
	if (ret)
	debug("%s: No sysreset driver: ret=%d\n",
	dev->name, ret);

	return 0;
	}

	U_BOOT_DRIVER(mpc83xx_clk) = {
	.name = "mpc83xx_clk",
	.id = UCLASS_CLK,
	.of_match = mpc83xx_clk_match,
	.ops = &mpc83xx_clk_ops,
	.probe = mpc83xx_clk_probe,
	.priv_auto_alloc_size = sizeof(struct mpc83xx_clk_priv),
	.bind = mpc83xx_clk_bind,
	};

	static int do_clocks(struct cmd_tbl *cmdtp, int flag, int argc,
	char *const argv[])
	{
	int i;
	char buf[32];
	struct udevice *clk;
	int ret;
	struct mpc83xx_clk_priv *priv;

	ret = uclass_first_device_err(UCLASS_CLK, &clk);
	if (ret) {
	debug("%s: Could not get clock device\n", __func__);
	return ret;
	}

	for (i = 0; i < MPC83XX_CLK_COUNT; i++) {
	if (!is_clk_valid(clk, i))
	continue;

	priv = dev_get_priv(clk);

	printf("%s = %s MHz\n", names[i], strmhz(buf, priv->speed[i]));
	}

	return 0;
	}

	U_BOOT_CMD(clocks, 1, 1, do_clocks,
	"display values of SoC's clocks",
	""
	);