drivers/clk/clk-loongson2.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Author: Yinbo Zhu <zhuyinbo@loongson.cn>
  * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
  */

 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/clk-provider.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <dt-bindings/clock/loongson,ls2k-clk.h>

 #define LOONGSON2_PLL_MULT_SHIFT		32
 #define LOONGSON2_PLL_MULT_WIDTH		10
 #define LOONGSON2_PLL_DIV_SHIFT			26
 #define LOONGSON2_PLL_DIV_WIDTH			6
 #define LOONGSON2_APB_FREQSCALE_SHIFT		20
 #define LOONGSON2_APB_FREQSCALE_WIDTH		3
 #define LOONGSON2_USB_FREQSCALE_SHIFT		16
 #define LOONGSON2_USB_FREQSCALE_WIDTH		3
 #define LOONGSON2_SATA_FREQSCALE_SHIFT		12
 #define LOONGSON2_SATA_FREQSCALE_WIDTH		3
 #define LOONGSON2_BOOT_FREQSCALE_SHIFT		8
 #define LOONGSON2_BOOT_FREQSCALE_WIDTH		3

 static void __iomem *loongson2_pll_base;

 static const struct clk_parent_data pdata[] = {
 	{ .fw_name = "ref_100m",},
 };

 static struct clk_hw *loongson2_clk_register(struct device *dev,
 					  const char *name,
 					  const char *parent_name,
 					  const struct clk_ops *ops,
 					  unsigned long flags)
 {
 	int ret;
 	struct clk_hw *hw;
 	struct clk_init_data init;

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

 	init.name = name;
 	init.ops = ops;
 	init.flags = flags;
 	init.num_parents = 1;

 	if (!parent_name)
 		init.parent_data = pdata;
 	else
 		init.parent_names = &parent_name;

 	hw->init = &init;

 	ret = devm_clk_hw_register(dev, hw);
 	if (ret)
 		hw = ERR_PTR(ret);

 	return hw;
 }

 static unsigned long loongson2_calc_pll_rate(int offset, unsigned long rate)
 {
 	u64 val;
 	u32 mult, div;

 	val = readq(loongson2_pll_base + offset);

 	mult = (val >> LOONGSON2_PLL_MULT_SHIFT) &
 			clk_div_mask(LOONGSON2_PLL_MULT_WIDTH);
 	div = (val >> LOONGSON2_PLL_DIV_SHIFT) &
 			clk_div_mask(LOONGSON2_PLL_DIV_WIDTH);

 	return div_u64((u64)rate * mult, div);
 }

 static unsigned long loongson2_node_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_pll_rate(0x0, parent_rate);
 }

 static const struct clk_ops loongson2_node_clk_ops = {
 	.recalc_rate = loongson2_node_recalc_rate,
 };

 static unsigned long loongson2_ddr_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_pll_rate(0x10, parent_rate);
 }

 static const struct clk_ops loongson2_ddr_clk_ops = {
 	.recalc_rate = loongson2_ddr_recalc_rate,
 };

 static unsigned long loongson2_dc_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_pll_rate(0x20, parent_rate);
 }

 static const struct clk_ops loongson2_dc_clk_ops = {
 	.recalc_rate = loongson2_dc_recalc_rate,
 };

 static unsigned long loongson2_pix0_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_pll_rate(0x30, parent_rate);
 }

 static const struct clk_ops loongson2_pix0_clk_ops = {
 	.recalc_rate = loongson2_pix0_recalc_rate,
 };

 static unsigned long loongson2_pix1_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_pll_rate(0x40, parent_rate);
 }

 static const struct clk_ops loongson2_pix1_clk_ops = {
 	.recalc_rate = loongson2_pix1_recalc_rate,
 };

 static unsigned long loongson2_calc_rate(unsigned long rate,
 					 int shift, int width)
 {
 	u64 val;
 	u32 mult;

 	val = readq(loongson2_pll_base + 0x50);

 	mult = (val >> shift) & clk_div_mask(width);

 	return div_u64((u64)rate * (mult + 1), 8);
 }

 static unsigned long loongson2_boot_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_rate(parent_rate,
 				   LOONGSON2_BOOT_FREQSCALE_SHIFT,
 				   LOONGSON2_BOOT_FREQSCALE_WIDTH);
 }

 static const struct clk_ops loongson2_boot_clk_ops = {
 	.recalc_rate = loongson2_boot_recalc_rate,
 };

 static unsigned long loongson2_apb_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_rate(parent_rate,
 				   LOONGSON2_APB_FREQSCALE_SHIFT,
 				   LOONGSON2_APB_FREQSCALE_WIDTH);
 }

 static const struct clk_ops loongson2_apb_clk_ops = {
 	.recalc_rate = loongson2_apb_recalc_rate,
 };

 static unsigned long loongson2_usb_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_rate(parent_rate,
 				   LOONGSON2_USB_FREQSCALE_SHIFT,
 				   LOONGSON2_USB_FREQSCALE_WIDTH);
 }

 static const struct clk_ops loongson2_usb_clk_ops = {
 	.recalc_rate = loongson2_usb_recalc_rate,
 };

 static unsigned long loongson2_sata_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return loongson2_calc_rate(parent_rate,
 				   LOONGSON2_SATA_FREQSCALE_SHIFT,
 				   LOONGSON2_SATA_FREQSCALE_WIDTH);
 }

 static const struct clk_ops loongson2_sata_clk_ops = {
 	.recalc_rate = loongson2_sata_recalc_rate,
 };

 static inline int loongson2_check_clk_hws(struct clk_hw *clks[], unsigned int count)
 {
 	unsigned int i;

 	for (i = 0; i < count; i++)
 		if (IS_ERR(clks[i])) {
 			pr_err("Loongson2 clk %u: register failed with %ld\n",
 				i, PTR_ERR(clks[i]));
 			return PTR_ERR(clks[i]);
 		}

 	return 0;
 }

 static int loongson2_clk_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct clk_hw **hws;
 	struct clk_hw_onecell_data *clk_hw_data;
 	spinlock_t loongson2_clk_lock;
 	struct device *dev = &pdev->dev;

 	loongson2_pll_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(loongson2_pll_base))
 		return PTR_ERR(loongson2_pll_base);

 	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, LOONGSON2_CLK_END),
 					GFP_KERNEL);
 	if (WARN_ON(!clk_hw_data))
 		return -ENOMEM;

 	clk_hw_data->num = LOONGSON2_CLK_END;
 	hws = clk_hw_data->hws;

 	hws[LOONGSON2_NODE_PLL] = loongson2_clk_register(dev, "node_pll",
 						NULL,
 						&loongson2_node_clk_ops, 0);

 	hws[LOONGSON2_DDR_PLL] = loongson2_clk_register(dev, "ddr_pll",
 						NULL,
 						&loongson2_ddr_clk_ops, 0);

 	hws[LOONGSON2_DC_PLL] = loongson2_clk_register(dev, "dc_pll",
 						NULL,
 						&loongson2_dc_clk_ops, 0);

 	hws[LOONGSON2_PIX0_PLL] = loongson2_clk_register(dev, "pix0_pll",
 						NULL,
 						&loongson2_pix0_clk_ops, 0);

 	hws[LOONGSON2_PIX1_PLL] = loongson2_clk_register(dev, "pix1_pll",
 						NULL,
 						&loongson2_pix1_clk_ops, 0);

 	hws[LOONGSON2_BOOT_CLK] = loongson2_clk_register(dev, "boot",
 						NULL,
 						&loongson2_boot_clk_ops, 0);

 	hws[LOONGSON2_NODE_CLK] = devm_clk_hw_register_divider(dev, "node",
 						"node_pll", 0,
 						loongson2_pll_base + 0x8, 0,
 						6, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	/*
 	 * The hda clk divisor in the upper 32bits and the clk-prodiver
 	 * layer code doesn't support 64bit io operation thus a conversion
 	 * is required that subtract shift by 32 and add 4byte to the hda
 	 * address
 	 */
 	hws[LOONGSON2_HDA_CLK] = devm_clk_hw_register_divider(dev, "hda",
 						"ddr_pll", 0,
 						loongson2_pll_base + 0x22, 12,
 						7, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_GPU_CLK] = devm_clk_hw_register_divider(dev, "gpu",
 						"ddr_pll", 0,
 						loongson2_pll_base + 0x18, 22,
 						6, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_DDR_CLK] = devm_clk_hw_register_divider(dev, "ddr",
 						"ddr_pll", 0,
 						loongson2_pll_base + 0x18, 0,
 						6, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_GMAC_CLK] = devm_clk_hw_register_divider(dev, "gmac",
 						"dc_pll", 0,
 						loongson2_pll_base + 0x28, 22,
 						6, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_DC_CLK] = devm_clk_hw_register_divider(dev, "dc",
 						"dc_pll", 0,
 						loongson2_pll_base + 0x28, 0,
 						6, CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_APB_CLK] = loongson2_clk_register(dev, "apb",
 						"gmac",
 						&loongson2_apb_clk_ops, 0);

 	hws[LOONGSON2_USB_CLK] = loongson2_clk_register(dev, "usb",
 						"gmac",
 						&loongson2_usb_clk_ops, 0);

 	hws[LOONGSON2_SATA_CLK] = loongson2_clk_register(dev, "sata",
 						"gmac",
 						&loongson2_sata_clk_ops, 0);

 	hws[LOONGSON2_PIX0_CLK] = clk_hw_register_divider(NULL, "pix0",
 						"pix0_pll", 0,
 						loongson2_pll_base + 0x38, 0, 6,
 						CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	hws[LOONGSON2_PIX1_CLK] = clk_hw_register_divider(NULL, "pix1",
 						"pix1_pll", 0,
 						loongson2_pll_base + 0x48, 0, 6,
 						CLK_DIVIDER_ONE_BASED,
 						&loongson2_clk_lock);

 	ret = loongson2_check_clk_hws(hws, LOONGSON2_CLK_END);
 	if (ret)
 		return ret;

 	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_hw_data);
 }

 static const struct of_device_id loongson2_clk_match_table[] = {
 	{ .compatible = "loongson,ls2k-clk" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, loongson2_clk_match_table);

 static struct platform_driver loongson2_clk_driver = {
 	.probe	= loongson2_clk_probe,
 	.driver	= {
 		.name	= "loongson2-clk",
 		.of_match_table	= loongson2_clk_match_table,
 	},
 };
 module_platform_driver(loongson2_clk_driver);

 MODULE_DESCRIPTION("Loongson2 clock driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Author: Yinbo Zhu <zhuyinbo@loongson.cn>
	* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
	*/

	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/clk-provider.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/io-64-nonatomic-lo-hi.h>
	#include <dt-bindings/clock/loongson,ls2k-clk.h>

	#define LOONGSON2_PLL_MULT_SHIFT 32
	#define LOONGSON2_PLL_MULT_WIDTH 10
	#define LOONGSON2_PLL_DIV_SHIFT 26
	#define LOONGSON2_PLL_DIV_WIDTH 6
	#define LOONGSON2_APB_FREQSCALE_SHIFT 20
	#define LOONGSON2_APB_FREQSCALE_WIDTH 3
	#define LOONGSON2_USB_FREQSCALE_SHIFT 16
	#define LOONGSON2_USB_FREQSCALE_WIDTH 3
	#define LOONGSON2_SATA_FREQSCALE_SHIFT 12
	#define LOONGSON2_SATA_FREQSCALE_WIDTH 3
	#define LOONGSON2_BOOT_FREQSCALE_SHIFT 8
	#define LOONGSON2_BOOT_FREQSCALE_WIDTH 3

	static void __iomem *loongson2_pll_base;

	static const struct clk_parent_data pdata[] = {
	{ .fw_name = "ref_100m",},
	};

	static struct clk_hw loongson2_clk_register(struct device dev,
	const char *name,
	const char *parent_name,
	const struct clk_ops *ops,
	unsigned long flags)
	{
	int ret;
	struct clk_hw *hw;
	struct clk_init_data init;

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

	init.name = name;
	init.ops = ops;
	init.flags = flags;
	init.num_parents = 1;

	if (!parent_name)
	init.parent_data = pdata;
	else
	init.parent_names = &parent_name;

	hw->init = &init;

	ret = devm_clk_hw_register(dev, hw);
	if (ret)
	hw = ERR_PTR(ret);

	return hw;
	}

	static unsigned long loongson2_calc_pll_rate(int offset, unsigned long rate)
	{
	u64 val;
	u32 mult, div;

	val = readq(loongson2_pll_base + offset);

	mult = (val >> LOONGSON2_PLL_MULT_SHIFT) &
	clk_div_mask(LOONGSON2_PLL_MULT_WIDTH);
	div = (val >> LOONGSON2_PLL_DIV_SHIFT) &
	clk_div_mask(LOONGSON2_PLL_DIV_WIDTH);

	return div_u64((u64)rate * mult, div);
	}

	static unsigned long loongson2_node_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_pll_rate(0x0, parent_rate);
	}

	static const struct clk_ops loongson2_node_clk_ops = {
	.recalc_rate = loongson2_node_recalc_rate,
	};

	static unsigned long loongson2_ddr_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_pll_rate(0x10, parent_rate);
	}

	static const struct clk_ops loongson2_ddr_clk_ops = {
	.recalc_rate = loongson2_ddr_recalc_rate,
	};

	static unsigned long loongson2_dc_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_pll_rate(0x20, parent_rate);
	}

	static const struct clk_ops loongson2_dc_clk_ops = {
	.recalc_rate = loongson2_dc_recalc_rate,
	};

	static unsigned long loongson2_pix0_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_pll_rate(0x30, parent_rate);
	}

	static const struct clk_ops loongson2_pix0_clk_ops = {
	.recalc_rate = loongson2_pix0_recalc_rate,
	};

	static unsigned long loongson2_pix1_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_pll_rate(0x40, parent_rate);
	}

	static const struct clk_ops loongson2_pix1_clk_ops = {
	.recalc_rate = loongson2_pix1_recalc_rate,
	};

	static unsigned long loongson2_calc_rate(unsigned long rate,
	int shift, int width)
	{
	u64 val;
	u32 mult;

	val = readq(loongson2_pll_base + 0x50);

	mult = (val >> shift) & clk_div_mask(width);

	return div_u64((u64)rate * (mult + 1), 8);
	}

	static unsigned long loongson2_boot_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_rate(parent_rate,
	LOONGSON2_BOOT_FREQSCALE_SHIFT,
	LOONGSON2_BOOT_FREQSCALE_WIDTH);
	}

	static const struct clk_ops loongson2_boot_clk_ops = {
	.recalc_rate = loongson2_boot_recalc_rate,
	};

	static unsigned long loongson2_apb_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_rate(parent_rate,
	LOONGSON2_APB_FREQSCALE_SHIFT,
	LOONGSON2_APB_FREQSCALE_WIDTH);
	}

	static const struct clk_ops loongson2_apb_clk_ops = {
	.recalc_rate = loongson2_apb_recalc_rate,
	};

	static unsigned long loongson2_usb_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_rate(parent_rate,
	LOONGSON2_USB_FREQSCALE_SHIFT,
	LOONGSON2_USB_FREQSCALE_WIDTH);
	}

	static const struct clk_ops loongson2_usb_clk_ops = {
	.recalc_rate = loongson2_usb_recalc_rate,
	};

	static unsigned long loongson2_sata_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return loongson2_calc_rate(parent_rate,
	LOONGSON2_SATA_FREQSCALE_SHIFT,
	LOONGSON2_SATA_FREQSCALE_WIDTH);
	}

	static const struct clk_ops loongson2_sata_clk_ops = {
	.recalc_rate = loongson2_sata_recalc_rate,
	};

	static inline int loongson2_check_clk_hws(struct clk_hw *clks[], unsigned int count)
	{
	unsigned int i;

	for (i = 0; i < count; i++)
	if (IS_ERR(clks[i])) {
	pr_err("Loongson2 clk %u: register failed with %ld\n",
	i, PTR_ERR(clks[i]));
	return PTR_ERR(clks[i]);
	}

	return 0;
	}

	static int loongson2_clk_probe(struct platform_device *pdev)
	{
	int ret;
	struct clk_hw **hws;
	struct clk_hw_onecell_data *clk_hw_data;
	spinlock_t loongson2_clk_lock;
	struct device *dev = &pdev->dev;

	loongson2_pll_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(loongson2_pll_base))
	return PTR_ERR(loongson2_pll_base);

	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, LOONGSON2_CLK_END),
	GFP_KERNEL);
	if (WARN_ON(!clk_hw_data))
	return -ENOMEM;

	clk_hw_data->num = LOONGSON2_CLK_END;
	hws = clk_hw_data->hws;

	hws[LOONGSON2_NODE_PLL] = loongson2_clk_register(dev, "node_pll",
	NULL,
	&loongson2_node_clk_ops, 0);

	hws[LOONGSON2_DDR_PLL] = loongson2_clk_register(dev, "ddr_pll",
	NULL,
	&loongson2_ddr_clk_ops, 0);

	hws[LOONGSON2_DC_PLL] = loongson2_clk_register(dev, "dc_pll",
	NULL,
	&loongson2_dc_clk_ops, 0);

	hws[LOONGSON2_PIX0_PLL] = loongson2_clk_register(dev, "pix0_pll",
	NULL,
	&loongson2_pix0_clk_ops, 0);

	hws[LOONGSON2_PIX1_PLL] = loongson2_clk_register(dev, "pix1_pll",
	NULL,
	&loongson2_pix1_clk_ops, 0);

	hws[LOONGSON2_BOOT_CLK] = loongson2_clk_register(dev, "boot",
	NULL,
	&loongson2_boot_clk_ops, 0);

	hws[LOONGSON2_NODE_CLK] = devm_clk_hw_register_divider(dev, "node",
	"node_pll", 0,
	loongson2_pll_base + 0x8, 0,
	6, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	/*
	* The hda clk divisor in the upper 32bits and the clk-prodiver
	* layer code doesn't support 64bit io operation thus a conversion
	* is required that subtract shift by 32 and add 4byte to the hda
	* address
	*/
	hws[LOONGSON2_HDA_CLK] = devm_clk_hw_register_divider(dev, "hda",
	"ddr_pll", 0,
	loongson2_pll_base + 0x22, 12,
	7, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_GPU_CLK] = devm_clk_hw_register_divider(dev, "gpu",
	"ddr_pll", 0,
	loongson2_pll_base + 0x18, 22,
	6, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_DDR_CLK] = devm_clk_hw_register_divider(dev, "ddr",
	"ddr_pll", 0,
	loongson2_pll_base + 0x18, 0,
	6, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_GMAC_CLK] = devm_clk_hw_register_divider(dev, "gmac",
	"dc_pll", 0,
	loongson2_pll_base + 0x28, 22,
	6, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_DC_CLK] = devm_clk_hw_register_divider(dev, "dc",
	"dc_pll", 0,
	loongson2_pll_base + 0x28, 0,
	6, CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_APB_CLK] = loongson2_clk_register(dev, "apb",
	"gmac",
	&loongson2_apb_clk_ops, 0);

	hws[LOONGSON2_USB_CLK] = loongson2_clk_register(dev, "usb",
	"gmac",
	&loongson2_usb_clk_ops, 0);

	hws[LOONGSON2_SATA_CLK] = loongson2_clk_register(dev, "sata",
	"gmac",
	&loongson2_sata_clk_ops, 0);

	hws[LOONGSON2_PIX0_CLK] = clk_hw_register_divider(NULL, "pix0",
	"pix0_pll", 0,
	loongson2_pll_base + 0x38, 0, 6,
	CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	hws[LOONGSON2_PIX1_CLK] = clk_hw_register_divider(NULL, "pix1",
	"pix1_pll", 0,
	loongson2_pll_base + 0x48, 0, 6,
	CLK_DIVIDER_ONE_BASED,
	&loongson2_clk_lock);

	ret = loongson2_check_clk_hws(hws, LOONGSON2_CLK_END);
	if (ret)
	return ret;

	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_hw_data);
	}

	static const struct of_device_id loongson2_clk_match_table[] = {
	{ .compatible = "loongson,ls2k-clk" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, loongson2_clk_match_table);

	static struct platform_driver loongson2_clk_driver = {
	.probe = loongson2_clk_probe,
	.driver = {
	.name = "loongson2-clk",
	.of_match_table = loongson2_clk_match_table,
	},
	};
	module_platform_driver(loongson2_clk_driver);

	MODULE_DESCRIPTION("Loongson2 clock driver");
	MODULE_LICENSE("GPL");