u-boot/drivers/clk/at91/pmc.c

/*
 * Copyright (C) 2016 Atmel Corporation
 *               Wenyou.Yang <wenyou.yang@atmel.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <clk-uclass.h>
#include <dm/device.h>
#include <dm/lists.h>
#include <dm/root.h>
#include "pmc.h"

DECLARE_GLOBAL_DATA_PTR;

static const struct udevice_id at91_pmc_match[] = {
	{ .compatible = "atmel,sama5d2-pmc" },
	{}
};

U_BOOT_DRIVER(at91_pmc) = {
	.name = "at91-pmc",
	.id = UCLASS_SIMPLE_BUS,
	.of_match = at91_pmc_match,
};

/*---------------------------------------------------------*/

int at91_pmc_core_probe(struct udevice *dev)
{
	struct pmc_platdata *plat = dev_get_platdata(dev);

	dev = dev_get_parent(dev);

	plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev);

	return 0;
}

/**
 * at91_clk_sub_device_bind() - for the at91 clock driver
 * Recursively bind its children as clk devices.
 *
 * @return: 0 on success, or negative error code on failure
 */
int at91_clk_sub_device_bind(struct udevice *dev, const char *drv_name)
{
	const void *fdt = gd->fdt_blob;
	int offset = dev_of_offset(dev);
	bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
	const char *name;
	int ret;

	for (offset = fdt_first_subnode(fdt, offset);
	     offset > 0;
	     offset = fdt_next_subnode(fdt, offset)) {
		if (pre_reloc_only &&
		    !fdt_getprop(fdt, offset, "u-boot,dm-pre-reloc", NULL))
			continue;
		/*
		 * If this node has "compatible" property, this is not
		 * a clock sub-node, but a normal device. skip.
		 */
		fdt_get_property(fdt, offset, "compatible", &ret);
		if (ret >= 0)
			continue;

		if (ret != -FDT_ERR_NOTFOUND)
			return ret;

		name = fdt_get_name(fdt, offset, NULL);
		if (!name)
			return -EINVAL;
		ret = device_bind_driver_to_node(dev, drv_name, name,
						 offset, NULL);
		if (ret)
			return ret;
	}

	return 0;
}

int at91_clk_of_xlate(struct clk *clk, struct fdtdec_phandle_args *args)
{
	int periph;

	if (args->args_count) {
		debug("Invalid args_count: %d\n", args->args_count);
		return -EINVAL;
	}

	periph = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(clk->dev), "reg",
				 -1);
	if (periph < 0)
		return -EINVAL;

	clk->id = periph;

	return 0;
}

int at91_clk_probe(struct udevice *dev)
{
	struct udevice *dev_periph_container, *dev_pmc;
	struct pmc_platdata *plat = dev_get_platdata(dev);

	dev_periph_container = dev_get_parent(dev);
	dev_pmc = dev_get_parent(dev_periph_container);

	plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev_pmc);

	return 0;
}