forked from mirrors/linux
7265c3cbbf
use devm variant for of_provider registration. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> [sboyd@kernel.org: Drop unused parent pointer] Signed-off-by: Stephen Boyd <sboyd@kernel.org>
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Qualcomm APCS clock controller driver
|
|
*
|
|
* Copyright (c) 2017, Linaro Limited
|
|
* Author: Georgi Djakov <georgi.djakov@linaro.org>
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "clk-regmap.h"
|
|
#include "clk-regmap-mux-div.h"
|
|
|
|
static const u32 gpll0_a53cc_map[] = { 4, 5 };
|
|
|
|
static const char * const gpll0_a53cc[] = {
|
|
"gpll0_vote",
|
|
"a53pll",
|
|
};
|
|
|
|
/*
|
|
* We use the notifier function for switching to a temporary safe configuration
|
|
* (mux and divider), while the A53 PLL is reconfigured.
|
|
*/
|
|
static int a53cc_notifier_cb(struct notifier_block *nb, unsigned long event,
|
|
void *data)
|
|
{
|
|
int ret = 0;
|
|
struct clk_regmap_mux_div *md = container_of(nb,
|
|
struct clk_regmap_mux_div,
|
|
clk_nb);
|
|
if (event == PRE_RATE_CHANGE)
|
|
/* set the mux and divider to safe frequency (400mhz) */
|
|
ret = mux_div_set_src_div(md, 4, 3);
|
|
|
|
return notifier_from_errno(ret);
|
|
}
|
|
|
|
static int qcom_apcs_msm8916_clk_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device *parent = dev->parent;
|
|
struct clk_regmap_mux_div *a53cc;
|
|
struct regmap *regmap;
|
|
struct clk_init_data init = { };
|
|
int ret = -ENODEV;
|
|
|
|
regmap = dev_get_regmap(parent, NULL);
|
|
if (!regmap) {
|
|
dev_err(dev, "failed to get regmap: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
a53cc = devm_kzalloc(dev, sizeof(*a53cc), GFP_KERNEL);
|
|
if (!a53cc)
|
|
return -ENOMEM;
|
|
|
|
init.name = "a53mux";
|
|
init.parent_names = gpll0_a53cc;
|
|
init.num_parents = ARRAY_SIZE(gpll0_a53cc);
|
|
init.ops = &clk_regmap_mux_div_ops;
|
|
init.flags = CLK_SET_RATE_PARENT;
|
|
|
|
a53cc->clkr.hw.init = &init;
|
|
a53cc->clkr.regmap = regmap;
|
|
a53cc->reg_offset = 0x50;
|
|
a53cc->hid_width = 5;
|
|
a53cc->hid_shift = 0;
|
|
a53cc->src_width = 3;
|
|
a53cc->src_shift = 8;
|
|
a53cc->parent_map = gpll0_a53cc_map;
|
|
|
|
a53cc->pclk = devm_clk_get(parent, NULL);
|
|
if (IS_ERR(a53cc->pclk)) {
|
|
ret = PTR_ERR(a53cc->pclk);
|
|
dev_err(dev, "failed to get clk: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
a53cc->clk_nb.notifier_call = a53cc_notifier_cb;
|
|
ret = clk_notifier_register(a53cc->pclk, &a53cc->clk_nb);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register clock notifier: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_clk_register_regmap(dev, &a53cc->clkr);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register regmap clock: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
|
|
&a53cc->clkr.hw);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add clock provider: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, a53cc);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
clk_notifier_unregister(a53cc->pclk, &a53cc->clk_nb);
|
|
return ret;
|
|
}
|
|
|
|
static int qcom_apcs_msm8916_clk_remove(struct platform_device *pdev)
|
|
{
|
|
struct clk_regmap_mux_div *a53cc = platform_get_drvdata(pdev);
|
|
|
|
clk_notifier_unregister(a53cc->pclk, &a53cc->clk_nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver qcom_apcs_msm8916_clk_driver = {
|
|
.probe = qcom_apcs_msm8916_clk_probe,
|
|
.remove = qcom_apcs_msm8916_clk_remove,
|
|
.driver = {
|
|
.name = "qcom-apcs-msm8916-clk",
|
|
},
|
|
};
|
|
module_platform_driver(qcom_apcs_msm8916_clk_driver);
|
|
|
|
MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Qualcomm MSM8916 APCS clock driver");
|