forked from Minki/linux
9ec2749bde
Not all clocks are implemented but client drivers can still request them. Currently we will return a NULL pointer to them if the clock isn't implemented in software but NULL pointers are valid clock pointers. Return an error pointer so that driver's don't proceed without a clock they may actually need. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
#include "common.h"
|
|
#include "clk-regmap.h"
|
|
#include "reset.h"
|
|
|
|
struct qcom_cc {
|
|
struct qcom_reset_controller reset;
|
|
struct clk_onecell_data data;
|
|
struct clk *clks[];
|
|
};
|
|
|
|
int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
|
|
{
|
|
void __iomem *base;
|
|
struct resource *res;
|
|
int i, ret;
|
|
struct device *dev = &pdev->dev;
|
|
struct clk *clk;
|
|
struct clk_onecell_data *data;
|
|
struct clk **clks;
|
|
struct regmap *regmap;
|
|
struct qcom_reset_controller *reset;
|
|
struct qcom_cc *cc;
|
|
size_t num_clks = desc->num_clks;
|
|
struct clk_regmap **rclks = desc->clks;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
regmap = devm_regmap_init_mmio(dev, base, desc->config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
|
|
GFP_KERNEL);
|
|
if (!cc)
|
|
return -ENOMEM;
|
|
|
|
clks = cc->clks;
|
|
data = &cc->data;
|
|
data->clks = clks;
|
|
data->clk_num = num_clks;
|
|
|
|
for (i = 0; i < num_clks; i++) {
|
|
if (!rclks[i]) {
|
|
clks[i] = ERR_PTR(-ENOENT);
|
|
continue;
|
|
}
|
|
clk = devm_clk_register_regmap(dev, rclks[i]);
|
|
if (IS_ERR(clk))
|
|
return PTR_ERR(clk);
|
|
clks[i] = clk;
|
|
}
|
|
|
|
ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
reset = &cc->reset;
|
|
reset->rcdev.of_node = dev->of_node;
|
|
reset->rcdev.ops = &qcom_reset_ops;
|
|
reset->rcdev.owner = dev->driver->owner;
|
|
reset->rcdev.nr_resets = desc->num_resets;
|
|
reset->regmap = regmap;
|
|
reset->reset_map = desc->resets;
|
|
platform_set_drvdata(pdev, &reset->rcdev);
|
|
|
|
ret = reset_controller_register(&reset->rcdev);
|
|
if (ret)
|
|
of_clk_del_provider(dev->of_node);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_cc_probe);
|
|
|
|
void qcom_cc_remove(struct platform_device *pdev)
|
|
{
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
reset_controller_unregister(platform_get_drvdata(pdev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_cc_remove);
|