linux-arkmicro/linux/drivers/clk/mediatek/clk-mt2701-hif.c

/*
 * Copyright (c) 2014 MediaTek Inc.
 * Author: Shunli Wang <shunli.wang@mediatek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk-provider.h>
#include <linux/platform_device.h>

#include "clk-mtk.h"
#include "clk-gate.h"

#include <dt-bindings/clock/mt2701-clk.h>

static const struct mtk_gate_regs hif_cg_regs = {
	.sta_ofs = 0x0030,
};

#define GATE_HIF(_id, _name, _parent, _shift) {		\
		.id = _id,				\
		.name = _name,				\
		.parent_name = _parent,			\
		.regs = &hif_cg_regs,			\
		.shift = _shift,			\
		.ops = &mtk_clk_gate_ops_no_setclr_inv,	\
	}

static const struct mtk_gate hif_clks[] = {
	GATE_HIF(CLK_HIFSYS_USB0PHY, "usb0_phy_clk", "ethpll_500m_ck", 21),
	GATE_HIF(CLK_HIFSYS_USB1PHY, "usb1_phy_clk", "ethpll_500m_ck", 22),
	GATE_HIF(CLK_HIFSYS_PCIE0, "pcie0_clk", "ethpll_500m_ck", 24),
	GATE_HIF(CLK_HIFSYS_PCIE1, "pcie1_clk", "ethpll_500m_ck", 25),
	GATE_HIF(CLK_HIFSYS_PCIE2, "pcie2_clk", "ethpll_500m_ck", 26),
};

static const struct of_device_id of_match_clk_mt2701_hif[] = {
	{ .compatible = "mediatek,mt2701-hifsys", },
	{}
};

static int clk_mt2701_hif_probe(struct platform_device *pdev)
{
	struct clk_onecell_data *clk_data;
	int r;
	struct device_node *node = pdev->dev.of_node;

	clk_data = mtk_alloc_clk_data(CLK_HIFSYS_NR);

	mtk_clk_register_gates(node, hif_clks, ARRAY_SIZE(hif_clks),
						clk_data);

	r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
	if (r) {
		dev_err(&pdev->dev,
			"could not register clock provider: %s: %d\n",
			pdev->name, r);
		return r;
	}

	mtk_register_reset_controller(node, 1, 0x34);

	return 0;
}

static struct platform_driver clk_mt2701_hif_drv = {
	.probe = clk_mt2701_hif_probe,
	.driver = {
		.name = "clk-mt2701-hif",
		.of_match_table = of_match_clk_mt2701_hif,
	},
};

builtin_platform_driver(clk_mt2701_hif_drv);