Orange Pi5 kernel

// 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 struct clk_parent_data pdata[] = {
<------>{ .fw_name = "aux", .name = "gpll0_vote", },
<------>{ .fw_name = "pll", .name = "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_data = pdata;
<------>init.num_parents = ARRAY_SIZE(pdata);
<------>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);
<------><------>if (ret != -EPROBE_DEFER)
<------><------><------>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");