mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 21:54:11 +08:00
91e6455bf7
We should hold the reference returned by of_get_parent() and use it
to call of_node_put() for refcount balance.
Fixes: f95e8c7923 ("clk: sprd: support to get regmap from parent node")
Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220704004729.272481-1-windhl@126.com
Reviewed-by: Orson Zhai <orsonzhai@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// Spreadtrum clock infrastructure
|
|
//
|
|
// Copyright (C) 2017 Spreadtrum, Inc.
|
|
// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
|
|
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "common.h"
|
|
|
|
static const struct regmap_config sprdclk_regmap_config = {
|
|
.reg_bits = 32,
|
|
.reg_stride = 4,
|
|
.val_bits = 32,
|
|
.max_register = 0xffff,
|
|
.fast_io = true,
|
|
};
|
|
|
|
static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
|
|
struct regmap *regmap)
|
|
{
|
|
int i;
|
|
struct sprd_clk_common *cclk;
|
|
|
|
for (i = 0; i < desc->num_clk_clks; i++) {
|
|
cclk = desc->clk_clks[i];
|
|
if (!cclk)
|
|
continue;
|
|
|
|
cclk->regmap = regmap;
|
|
}
|
|
}
|
|
|
|
int sprd_clk_regmap_init(struct platform_device *pdev,
|
|
const struct sprd_clk_desc *desc)
|
|
{
|
|
void __iomem *base;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *node = dev->of_node, *np;
|
|
struct regmap *regmap;
|
|
|
|
if (of_find_property(node, "sprd,syscon", NULL)) {
|
|
regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
|
|
if (IS_ERR(regmap)) {
|
|
pr_err("%s: failed to get syscon regmap\n", __func__);
|
|
return PTR_ERR(regmap);
|
|
}
|
|
} else if (of_device_is_compatible(np = of_get_parent(node), "syscon") ||
|
|
(of_node_put(np), 0)) {
|
|
regmap = device_node_to_regmap(np);
|
|
of_node_put(np);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(dev, "failed to get regmap from its parent.\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
} else {
|
|
base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
regmap = devm_regmap_init_mmio(&pdev->dev, base,
|
|
&sprdclk_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
pr_err("failed to init regmap\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
}
|
|
|
|
sprd_clk_set_regmap(desc, regmap);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
|
|
|
|
int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
|
|
{
|
|
int i, ret;
|
|
struct clk_hw *hw;
|
|
|
|
for (i = 0; i < clkhw->num; i++) {
|
|
const char *name;
|
|
|
|
hw = clkhw->hws[i];
|
|
if (!hw)
|
|
continue;
|
|
|
|
name = hw->init->name;
|
|
ret = devm_clk_hw_register(dev, hw);
|
|
if (ret) {
|
|
dev_err(dev, "Couldn't register clock %d - %s\n",
|
|
i, name);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
|
|
if (ret)
|
|
dev_err(dev, "Failed to add clock provider\n");
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sprd_clk_probe);
|
|
|
|
MODULE_LICENSE("GPL v2");
|