u-boot/drivers/clk/microchip/mpfs_clk.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2020 Microchip Technology Inc.
 * Padmarao Begari <padmarao.begari@microchip.com>
 */
#include <common.h>
#include <clk.h>
#include <clk-uclass.h>
#include <dm.h>
#include <log.h>
#include <dm/device.h>
#include <dm/devres.h>
#include <dm/uclass.h>
#include <linux/err.h>

#include "mpfs_clk.h"

static int mpfs_clk_probe(struct udevice *dev)
{
	int ret;
	void __iomem *base;
	u32 clk_rate;
	const char *parent_clk_name;
	struct clk *clk = dev_get_priv(dev);

	base = dev_read_addr_ptr(dev);
	if (!base)
		return -EINVAL;

	ret = clk_get_by_index(dev, 0, clk);
	if (ret)
		return ret;

	dev_read_u32(clk->dev, "clock-frequency", &clk_rate);
	parent_clk_name = clk->dev->name;

	ret = mpfs_clk_register_cfgs(base, clk_rate, parent_clk_name);
	if (ret)
		return ret;

	ret = mpfs_clk_register_periphs(base, clk_rate, "clk_ahb");

	return ret;
}

static const struct udevice_id mpfs_of_match[] = {
	{ .compatible = "microchip,mpfs-clkcfg" },
	{ }
};

U_BOOT_DRIVER(mpfs_clk) = {
	.name = "mpfs_clk",
	.id = UCLASS_CLK,
	.of_match = mpfs_of_match,
	.ops = &ccf_clk_ops,
	.probe = mpfs_clk_probe,
	.priv_auto = sizeof(struct clk),
	.flags = DM_FLAG_PRE_RELOC,
};