pmc.c
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/*
* 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 <dm/util.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;
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 &&
!dm_fdt_pre_reloc(fdt, offset))
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, clk->dev->of_offset, "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;
}