drivers/clk/mvebu/cp110-system-controller.c - kernel/msm-4.9 - Gitiles

 /*
  * Marvell Armada CP110 System Controller
  *
  * Copyright (C) 2016 Marvell
  *
  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 /*
  * CP110 has 5 core clocks:
  *
  *  - APLL		(1 Ghz)
  *    - PPv2 core	(1/3 APLL)
  *    - EIP		(1/2 APLL)
  *      - Core		(1/2 EIP)
  *
  *  - NAND clock, which is either:
  *    - Equal to the core clock
  *    - 2/5 APLL
  *
  * CP110 has 32 gatable clocks, for the various peripherals in the
  * IP. They have fairly complicated parent/child relationships.
  */

 #define pr_fmt(fmt) "cp110-system-controller: " fmt

 #include <linux/clk-provider.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #define CP110_PM_CLOCK_GATING_REG	0x220
 #define CP110_NAND_FLASH_CLK_CTRL_REG	0x700
 #define    NF_CLOCK_SEL_400_MASK	BIT(0)

 enum {
 	CP110_CLK_TYPE_CORE,
 	CP110_CLK_TYPE_GATABLE,
 };

 #define CP110_MAX_CORE_CLOCKS		5
 #define CP110_MAX_GATABLE_CLOCKS	32

 #define CP110_CLK_NUM \
 	(CP110_MAX_CORE_CLOCKS + CP110_MAX_GATABLE_CLOCKS)

 #define CP110_CORE_APLL			0
 #define CP110_CORE_PPV2			1
 #define CP110_CORE_EIP			2
 #define CP110_CORE_CORE			3
 #define CP110_CORE_NAND			4

 /* A number of gatable clocks need special handling */
 #define CP110_GATE_AUDIO		0
 #define CP110_GATE_COMM_UNIT		1
 #define CP110_GATE_NAND			2
 #define CP110_GATE_PPV2			3
 #define CP110_GATE_SDIO			4
 #define CP110_GATE_XOR1			7
 #define CP110_GATE_XOR0			8
 #define CP110_GATE_PCIE_X1_0		11
 #define CP110_GATE_PCIE_X1_1		12
 #define CP110_GATE_PCIE_X4		13
 #define CP110_GATE_PCIE_XOR		14
 #define CP110_GATE_SATA			15
 #define CP110_GATE_SATA_USB		16
 #define CP110_GATE_MAIN			17
 #define CP110_GATE_SDMMC		18
 #define CP110_GATE_SLOW_IO		21
 #define CP110_GATE_USB3H0		22
 #define CP110_GATE_USB3H1		23
 #define CP110_GATE_USB3DEV		24
 #define CP110_GATE_EIP150		25
 #define CP110_GATE_EIP197		26

 struct cp110_gate_clk {
 	struct clk_hw hw;
 	struct regmap *regmap;
 	u8 bit_idx;
 };

 #define to_cp110_gate_clk(clk) container_of(clk, struct cp110_gate_clk, hw)

 static int cp110_gate_enable(struct clk_hw *hw)
 {
 	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);

 	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
 			   BIT(gate->bit_idx), BIT(gate->bit_idx));

 	return 0;
 }

 static void cp110_gate_disable(struct clk_hw *hw)
 {
 	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);

 	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
 			   BIT(gate->bit_idx), 0);
 }

 static int cp110_gate_is_enabled(struct clk_hw *hw)
 {
 	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);
 	u32 val;

 	regmap_read(gate->regmap, CP110_PM_CLOCK_GATING_REG, &val);

 	return val & BIT(gate->bit_idx);
 }

 static const struct clk_ops cp110_gate_ops = {
 	.enable = cp110_gate_enable,
 	.disable = cp110_gate_disable,
 	.is_enabled = cp110_gate_is_enabled,
 };

 static struct clk *cp110_register_gate(const char *name,
 				       const char *parent_name,
 				       struct regmap *regmap, u8 bit_idx)
 {
 	struct cp110_gate_clk *gate;
 	struct clk *clk;
 	struct clk_init_data init;

 	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 	if (!gate)
 		return ERR_PTR(-ENOMEM);

 	memset(&init, 0, sizeof(init));

 	init.name = name;
 	init.ops = &cp110_gate_ops;
 	init.parent_names = &parent_name;
 	init.num_parents = 1;

 	gate->regmap = regmap;
 	gate->bit_idx = bit_idx;
 	gate->hw.init = &init;

 	clk = clk_register(NULL, &gate->hw);
 	if (IS_ERR(clk))
 		kfree(gate);

 	return clk;
 }

 static void cp110_unregister_gate(struct clk *clk)
 {
 	struct clk_hw *hw;

 	hw = __clk_get_hw(clk);
 	if (!hw)
 		return;

 	clk_unregister(clk);
 	kfree(to_cp110_gate_clk(hw));
 }

 static struct clk *cp110_of_clk_get(struct of_phandle_args *clkspec, void *data)
 {
 	struct clk_onecell_data *clk_data = data;
 	unsigned int type = clkspec->args[0];
 	unsigned int idx = clkspec->args[1];

 	if (type == CP110_CLK_TYPE_CORE) {
 		if (idx > CP110_MAX_CORE_CLOCKS)
 			return ERR_PTR(-EINVAL);
 		return clk_data->clks[idx];
 	} else if (type == CP110_CLK_TYPE_GATABLE) {
 		if (idx > CP110_MAX_GATABLE_CLOCKS)
 			return ERR_PTR(-EINVAL);
 		return clk_data->clks[CP110_MAX_CORE_CLOCKS + idx];
 	}

 	return ERR_PTR(-EINVAL);
 }

 static int cp110_syscon_clk_probe(struct platform_device *pdev)
 {
 	struct regmap *regmap;
 	struct device_node *np = pdev->dev.of_node;
 	const char *ppv2_name, *apll_name, *core_name, *eip_name, *nand_name;
 	struct clk_onecell_data *cp110_clk_data;
 	struct clk *clk, **cp110_clks;
 	u32 nand_clk_ctrl;
 	int i, ret;

 	regmap = syscon_node_to_regmap(np);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	ret = regmap_read(regmap, CP110_NAND_FLASH_CLK_CTRL_REG,
 			  &nand_clk_ctrl);
 	if (ret)
 		return ret;

 	cp110_clks = devm_kcalloc(&pdev->dev, sizeof(struct clk *),
 				  CP110_CLK_NUM, GFP_KERNEL);
 	if (!cp110_clks)
 		return -ENOMEM;

 	cp110_clk_data = devm_kzalloc(&pdev->dev,
 				      sizeof(*cp110_clk_data),
 				      GFP_KERNEL);
 	if (!cp110_clk_data)
 		return -ENOMEM;

 	cp110_clk_data->clks = cp110_clks;
 	cp110_clk_data->clk_num = CP110_CLK_NUM;

 	/* Register the APLL which is the root of the clk tree */
 	of_property_read_string_index(np, "core-clock-output-names",
 				      CP110_CORE_APLL, &apll_name);
 	clk = clk_register_fixed_rate(NULL, apll_name, NULL, 0,
 				      1000 * 1000 * 1000);
 	if (IS_ERR(clk)) {
 		ret = PTR_ERR(clk);
 		goto fail0;
 	}

 	cp110_clks[CP110_CORE_APLL] = clk;

 	/* PPv2 is APLL/3 */
 	of_property_read_string_index(np, "core-clock-output-names",
 				      CP110_CORE_PPV2, &ppv2_name);
 	clk = clk_register_fixed_factor(NULL, ppv2_name, apll_name, 0, 1, 3);
 	if (IS_ERR(clk)) {
 		ret = PTR_ERR(clk);
 		goto fail1;
 	}

 	cp110_clks[CP110_CORE_PPV2] = clk;

 	/* EIP clock is APLL/2 */
 	of_property_read_string_index(np, "core-clock-output-names",
 				      CP110_CORE_EIP, &eip_name);
 	clk = clk_register_fixed_factor(NULL, eip_name, apll_name, 0, 1, 2);
 	if (IS_ERR(clk)) {
 		ret = PTR_ERR(clk);
 		goto fail2;
 	}

 	cp110_clks[CP110_CORE_EIP] = clk;

 	/* Core clock is EIP/2 */
 	of_property_read_string_index(np, "core-clock-output-names",
 				      CP110_CORE_CORE, &core_name);
 	clk = clk_register_fixed_factor(NULL, core_name, eip_name, 0, 1, 2);
 	if (IS_ERR(clk)) {
 		ret = PTR_ERR(clk);
 		goto fail3;
 	}

 	cp110_clks[CP110_CORE_CORE] = clk;

 	/* NAND can be either APLL/2.5 or core clock */
 	of_property_read_string_index(np, "core-clock-output-names",
 				      CP110_CORE_NAND, &nand_name);
 	if (nand_clk_ctrl & NF_CLOCK_SEL_400_MASK)
 		clk = clk_register_fixed_factor(NULL, nand_name,
 						apll_name, 0, 2, 5);
 	else
 		clk = clk_register_fixed_factor(NULL, nand_name,
 						core_name, 0, 1, 1);
 	if (IS_ERR(clk)) {
 		ret = PTR_ERR(clk);
 		goto fail4;
 	}

 	cp110_clks[CP110_CORE_NAND] = clk;

 	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
 		const char *parent, *name;
 		int ret;

 		ret = of_property_read_string_index(np,
 						    "gate-clock-output-names",
 						    i, &name);
 		/* Reached the end of the list? */
 		if (ret < 0)
 			break;

 		if (!strcmp(name, "none"))
 			continue;

 		switch (i) {
 		case CP110_GATE_AUDIO:
 		case CP110_GATE_COMM_UNIT:
 		case CP110_GATE_EIP150:
 		case CP110_GATE_EIP197:
 		case CP110_GATE_SLOW_IO:
 			of_property_read_string_index(np,
 						      "gate-clock-output-names",
 						      CP110_GATE_MAIN, &parent);
 			break;
 		case CP110_GATE_NAND:
 			parent = nand_name;
 			break;
 		case CP110_GATE_PPV2:
 			parent = ppv2_name;
 			break;
 		case CP110_GATE_SDIO:
 			of_property_read_string_index(np,
 						      "gate-clock-output-names",
 						      CP110_GATE_SDMMC, &parent);
 			break;
 		case CP110_GATE_XOR1:
 		case CP110_GATE_XOR0:
 		case CP110_GATE_PCIE_X1_0:
 		case CP110_GATE_PCIE_X1_1:
 		case CP110_GATE_PCIE_X4:
 			of_property_read_string_index(np,
 						      "gate-clock-output-names",
 						      CP110_GATE_PCIE_XOR, &parent);
 			break;
 		case CP110_GATE_SATA:
 		case CP110_GATE_USB3H0:
 		case CP110_GATE_USB3H1:
 		case CP110_GATE_USB3DEV:
 			of_property_read_string_index(np,
 						      "gate-clock-output-names",
 						      CP110_GATE_SATA_USB, &parent);
 			break;
 		default:
 			parent = core_name;
 			break;
 		}

 		clk = cp110_register_gate(name, parent, regmap, i);
 		if (IS_ERR(clk)) {
 			ret = PTR_ERR(clk);
 			goto fail_gate;
 		}

 		cp110_clks[CP110_MAX_CORE_CLOCKS + i] = clk;
 	}

 	ret = of_clk_add_provider(np, cp110_of_clk_get, cp110_clk_data);
 	if (ret)
 		goto fail_clk_add;

 	platform_set_drvdata(pdev, cp110_clks);

 	return 0;

 fail_clk_add:
 fail_gate:
 	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
 		clk = cp110_clks[CP110_MAX_CORE_CLOCKS + i];

 		if (clk)
 			cp110_unregister_gate(clk);
 	}

 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]);
 fail4:
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
 fail3:
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_EIP]);
 fail2:
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_PPV2]);
 fail1:
 	clk_unregister_fixed_rate(cp110_clks[CP110_CORE_APLL]);
 fail0:
 	return ret;
 }

 static int cp110_syscon_clk_remove(struct platform_device *pdev)
 {
 	struct clk **cp110_clks = platform_get_drvdata(pdev);
 	int i;

 	of_clk_del_provider(pdev->dev.of_node);

 	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
 		struct clk *clk = cp110_clks[CP110_MAX_CORE_CLOCKS + i];

 		if (clk)
 			cp110_unregister_gate(clk);
 	}

 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]);
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_EIP]);
 	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_PPV2]);
 	clk_unregister_fixed_rate(cp110_clks[CP110_CORE_APLL]);

 	return 0;
 }

 static const struct of_device_id cp110_syscon_of_match[] = {
 	{ .compatible = "marvell,cp110-system-controller0", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, armada8k_pcie_of_match);

 static struct platform_driver cp110_syscon_driver = {
 	.probe = cp110_syscon_clk_probe,
 	.remove = cp110_syscon_clk_remove,
 	.driver		= {
 		.name	= "marvell-cp110-system-controller0",
 		.of_match_table = cp110_syscon_of_match,
 	},
 };

 module_platform_driver(cp110_syscon_driver);

 MODULE_DESCRIPTION("Marvell CP110 System Controller 0 driver");
 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
 MODULE_LICENSE("GPL");
	/*
	* Marvell Armada CP110 System Controller
	*
	* Copyright (C) 2016 Marvell
	*
	* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	/*
	* CP110 has 5 core clocks:
	*
	* - APLL (1 Ghz)
	* - PPv2 core (1/3 APLL)
	* - EIP (1/2 APLL)
	* - Core (1/2 EIP)
	*
	* - NAND clock, which is either:
	* - Equal to the core clock
	* - 2/5 APLL
	*
	* CP110 has 32 gatable clocks, for the various peripherals in the
	* IP. They have fairly complicated parent/child relationships.
	*/

	#define pr_fmt(fmt) "cp110-system-controller: " fmt

	#include <linux/clk-provider.h>
	#include <linux/mfd/syscon.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#define CP110_PM_CLOCK_GATING_REG 0x220
	#define CP110_NAND_FLASH_CLK_CTRL_REG 0x700
	#define NF_CLOCK_SEL_400_MASK BIT(0)

	enum {
	CP110_CLK_TYPE_CORE,
	CP110_CLK_TYPE_GATABLE,
	};

	#define CP110_MAX_CORE_CLOCKS 5
	#define CP110_MAX_GATABLE_CLOCKS 32

	#define CP110_CLK_NUM \
	(CP110_MAX_CORE_CLOCKS + CP110_MAX_GATABLE_CLOCKS)

	#define CP110_CORE_APLL 0
	#define CP110_CORE_PPV2 1
	#define CP110_CORE_EIP 2
	#define CP110_CORE_CORE 3
	#define CP110_CORE_NAND 4

	/* A number of gatable clocks need special handling */
	#define CP110_GATE_AUDIO 0
	#define CP110_GATE_COMM_UNIT 1
	#define CP110_GATE_NAND 2
	#define CP110_GATE_PPV2 3
	#define CP110_GATE_SDIO 4
	#define CP110_GATE_XOR1 7
	#define CP110_GATE_XOR0 8
	#define CP110_GATE_PCIE_X1_0 11
	#define CP110_GATE_PCIE_X1_1 12
	#define CP110_GATE_PCIE_X4 13
	#define CP110_GATE_PCIE_XOR 14
	#define CP110_GATE_SATA 15
	#define CP110_GATE_SATA_USB 16
	#define CP110_GATE_MAIN 17
	#define CP110_GATE_SDMMC 18
	#define CP110_GATE_SLOW_IO 21
	#define CP110_GATE_USB3H0 22
	#define CP110_GATE_USB3H1 23
	#define CP110_GATE_USB3DEV 24
	#define CP110_GATE_EIP150 25
	#define CP110_GATE_EIP197 26

	struct cp110_gate_clk {
	struct clk_hw hw;
	struct regmap *regmap;
	u8 bit_idx;
	};

	#define to_cp110_gate_clk(clk) container_of(clk, struct cp110_gate_clk, hw)

	static int cp110_gate_enable(struct clk_hw *hw)
	{
	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);

	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
	BIT(gate->bit_idx), BIT(gate->bit_idx));

	return 0;
	}

	static void cp110_gate_disable(struct clk_hw *hw)
	{
	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);

	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
	BIT(gate->bit_idx), 0);
	}

	static int cp110_gate_is_enabled(struct clk_hw *hw)
	{
	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);
	u32 val;

	regmap_read(gate->regmap, CP110_PM_CLOCK_GATING_REG, &val);

	return val & BIT(gate->bit_idx);
	}

	static const struct clk_ops cp110_gate_ops = {
	.enable = cp110_gate_enable,
	.disable = cp110_gate_disable,
	.is_enabled = cp110_gate_is_enabled,
	};

	static struct clk cp110_register_gate(const char name,
	const char *parent_name,
	struct regmap *regmap, u8 bit_idx)
	{
	struct cp110_gate_clk *gate;
	struct clk *clk;
	struct clk_init_data init;

	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
	if (!gate)
	return ERR_PTR(-ENOMEM);

	memset(&init, 0, sizeof(init));

	init.name = name;
	init.ops = &cp110_gate_ops;
	init.parent_names = &parent_name;
	init.num_parents = 1;

	gate->regmap = regmap;
	gate->bit_idx = bit_idx;
	gate->hw.init = &init;

	clk = clk_register(NULL, &gate->hw);
	if (IS_ERR(clk))
	kfree(gate);

	return clk;
	}

	static void cp110_unregister_gate(struct clk *clk)
	{
	struct clk_hw *hw;

	hw = __clk_get_hw(clk);
	if (!hw)
	return;

	clk_unregister(clk);
	kfree(to_cp110_gate_clk(hw));
	}

	static struct clk cp110_of_clk_get(struct of_phandle_args clkspec, void *data)
	{
	struct clk_onecell_data *clk_data = data;
	unsigned int type = clkspec->args[0];
	unsigned int idx = clkspec->args[1];

	if (type == CP110_CLK_TYPE_CORE) {
	if (idx > CP110_MAX_CORE_CLOCKS)
	return ERR_PTR(-EINVAL);
	return clk_data->clks[idx];
	} else if (type == CP110_CLK_TYPE_GATABLE) {
	if (idx > CP110_MAX_GATABLE_CLOCKS)
	return ERR_PTR(-EINVAL);
	return clk_data->clks[CP110_MAX_CORE_CLOCKS + idx];
	}

	return ERR_PTR(-EINVAL);
	}

	static int cp110_syscon_clk_probe(struct platform_device *pdev)
	{
	struct regmap *regmap;
	struct device_node *np = pdev->dev.of_node;
	const char ppv2_name, apll_name, core_name, eip_name, *nand_name;
	struct clk_onecell_data *cp110_clk_data;
	struct clk clk, *cp110_clks;
	u32 nand_clk_ctrl;
	int i, ret;

	regmap = syscon_node_to_regmap(np);
	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	ret = regmap_read(regmap, CP110_NAND_FLASH_CLK_CTRL_REG,
	&nand_clk_ctrl);
	if (ret)
	return ret;

	cp110_clks = devm_kcalloc(&pdev->dev, sizeof(struct clk *),
	CP110_CLK_NUM, GFP_KERNEL);
	if (!cp110_clks)
	return -ENOMEM;

	cp110_clk_data = devm_kzalloc(&pdev->dev,
	sizeof(*cp110_clk_data),
	GFP_KERNEL);
	if (!cp110_clk_data)
	return -ENOMEM;

	cp110_clk_data->clks = cp110_clks;
	cp110_clk_data->clk_num = CP110_CLK_NUM;

	/* Register the APLL which is the root of the clk tree */
	of_property_read_string_index(np, "core-clock-output-names",
	CP110_CORE_APLL, &apll_name);
	clk = clk_register_fixed_rate(NULL, apll_name, NULL, 0,
	1000 * 1000 * 1000);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail0;
	}

	cp110_clks[CP110_CORE_APLL] = clk;

	/* PPv2 is APLL/3 */
	of_property_read_string_index(np, "core-clock-output-names",
	CP110_CORE_PPV2, &ppv2_name);
	clk = clk_register_fixed_factor(NULL, ppv2_name, apll_name, 0, 1, 3);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail1;
	}

	cp110_clks[CP110_CORE_PPV2] = clk;

	/* EIP clock is APLL/2 */
	of_property_read_string_index(np, "core-clock-output-names",
	CP110_CORE_EIP, &eip_name);
	clk = clk_register_fixed_factor(NULL, eip_name, apll_name, 0, 1, 2);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail2;
	}

	cp110_clks[CP110_CORE_EIP] = clk;

	/* Core clock is EIP/2 */
	of_property_read_string_index(np, "core-clock-output-names",
	CP110_CORE_CORE, &core_name);
	clk = clk_register_fixed_factor(NULL, core_name, eip_name, 0, 1, 2);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail3;
	}

	cp110_clks[CP110_CORE_CORE] = clk;

	/* NAND can be either APLL/2.5 or core clock */
	of_property_read_string_index(np, "core-clock-output-names",
	CP110_CORE_NAND, &nand_name);
	if (nand_clk_ctrl & NF_CLOCK_SEL_400_MASK)
	clk = clk_register_fixed_factor(NULL, nand_name,
	apll_name, 0, 2, 5);
	else
	clk = clk_register_fixed_factor(NULL, nand_name,
	core_name, 0, 1, 1);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail4;
	}

	cp110_clks[CP110_CORE_NAND] = clk;

	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
	const char parent, name;
	int ret;

	ret = of_property_read_string_index(np,
	"gate-clock-output-names",
	i, &name);
	/* Reached the end of the list? */
	if (ret < 0)
	break;

	if (!strcmp(name, "none"))
	continue;

	switch (i) {
	case CP110_GATE_AUDIO:
	case CP110_GATE_COMM_UNIT:
	case CP110_GATE_EIP150:
	case CP110_GATE_EIP197:
	case CP110_GATE_SLOW_IO:
	of_property_read_string_index(np,
	"gate-clock-output-names",
	CP110_GATE_MAIN, &parent);
	break;
	case CP110_GATE_NAND:
	parent = nand_name;
	break;
	case CP110_GATE_PPV2:
	parent = ppv2_name;
	break;
	case CP110_GATE_SDIO:
	of_property_read_string_index(np,
	"gate-clock-output-names",
	CP110_GATE_SDMMC, &parent);
	break;
	case CP110_GATE_XOR1:
	case CP110_GATE_XOR0:
	case CP110_GATE_PCIE_X1_0:
	case CP110_GATE_PCIE_X1_1:
	case CP110_GATE_PCIE_X4:
	of_property_read_string_index(np,
	"gate-clock-output-names",
	CP110_GATE_PCIE_XOR, &parent);
	break;
	case CP110_GATE_SATA:
	case CP110_GATE_USB3H0:
	case CP110_GATE_USB3H1:
	case CP110_GATE_USB3DEV:
	of_property_read_string_index(np,
	"gate-clock-output-names",
	CP110_GATE_SATA_USB, &parent);
	break;
	default:
	parent = core_name;
	break;
	}

	clk = cp110_register_gate(name, parent, regmap, i);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	goto fail_gate;
	}

	cp110_clks[CP110_MAX_CORE_CLOCKS + i] = clk;
	}

	ret = of_clk_add_provider(np, cp110_of_clk_get, cp110_clk_data);
	if (ret)
	goto fail_clk_add;

	platform_set_drvdata(pdev, cp110_clks);

	return 0;

	fail_clk_add:
	fail_gate:
	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
	clk = cp110_clks[CP110_MAX_CORE_CLOCKS + i];

	if (clk)
	cp110_unregister_gate(clk);
	}

	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]);
	fail4:
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
	fail3:
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_EIP]);
	fail2:
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_PPV2]);
	fail1:
	clk_unregister_fixed_rate(cp110_clks[CP110_CORE_APLL]);
	fail0:
	return ret;
	}

	static int cp110_syscon_clk_remove(struct platform_device *pdev)
	{
	struct clk **cp110_clks = platform_get_drvdata(pdev);
	int i;

	of_clk_del_provider(pdev->dev.of_node);

	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
	struct clk *clk = cp110_clks[CP110_MAX_CORE_CLOCKS + i];

	if (clk)
	cp110_unregister_gate(clk);
	}

	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]);
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_EIP]);
	clk_unregister_fixed_factor(cp110_clks[CP110_CORE_PPV2]);
	clk_unregister_fixed_rate(cp110_clks[CP110_CORE_APLL]);

	return 0;
	}

	static const struct of_device_id cp110_syscon_of_match[] = {
	{ .compatible = "marvell,cp110-system-controller0", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, armada8k_pcie_of_match);

	static struct platform_driver cp110_syscon_driver = {
	.probe = cp110_syscon_clk_probe,
	.remove = cp110_syscon_clk_remove,
	.driver = {
	.name = "marvell-cp110-system-controller0",
	.of_match_table = cp110_syscon_of_match,
	},
	};

	module_platform_driver(cp110_syscon_driver);

	MODULE_DESCRIPTION("Marvell CP110 System Controller 0 driver");
	MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
	MODULE_LICENSE("GPL");