mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![Stephen Boyd](/assets/img/avatar_default.png)
A future patch is going to change semantics of clk_register() so that clk_hw::init is guaranteed to be NULL after a clk is registered. Avoid referencing this member here so that we don't run into NULL pointer exceptions. Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Link: https://lkml.kernel.org/r/20190731193517.237136-2-sboyd@kernel.org [sboyd@kernel.org: Move name to after checking for error or NULL hw] Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// OWL common clock driver
|
|
//
|
|
// Copyright (c) 2014 Actions Semi Inc.
|
|
// Author: David Liu <liuwei@actions-semi.com>
|
|
//
|
|
// Copyright (c) 2018 Linaro Ltd.
|
|
// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
|
|
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "owl-common.h"
|
|
|
|
static const struct regmap_config owl_regmap_config = {
|
|
.reg_bits = 32,
|
|
.reg_stride = 4,
|
|
.val_bits = 32,
|
|
.max_register = 0x00cc,
|
|
.fast_io = true,
|
|
};
|
|
|
|
static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
|
|
struct regmap *regmap)
|
|
{
|
|
int i;
|
|
struct owl_clk_common *clks;
|
|
|
|
for (i = 0; i < desc->num_clks; i++) {
|
|
clks = desc->clks[i];
|
|
if (!clks)
|
|
continue;
|
|
|
|
clks->regmap = regmap;
|
|
}
|
|
}
|
|
|
|
int owl_clk_regmap_init(struct platform_device *pdev,
|
|
struct owl_clk_desc *desc)
|
|
{
|
|
void __iomem *base;
|
|
struct regmap *regmap;
|
|
struct resource *res;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
pr_err("failed to init regmap\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
owl_clk_set_regmap(desc, regmap);
|
|
desc->regmap = regmap;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
|
|
{
|
|
int i, ret;
|
|
struct clk_hw *hw;
|
|
|
|
for (i = 0; i < hw_clks->num; i++) {
|
|
const char *name;
|
|
|
|
hw = hw_clks->hws[i];
|
|
if (IS_ERR_OR_NULL(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, hw_clks);
|
|
if (ret)
|
|
dev_err(dev, "Failed to add clock provider\n");
|
|
|
|
return ret;
|
|
}
|