linux/drivers/devfreq/imx-bus.c
Dong Aisheng 7dbc0d2468 PM / devfreq: imx-bus: Remove imx_bus_get_dev_status
Current driver actually does not support simple ondemand governor
as it's unable to provide device load information. So removing
the unnecessary callback to avoid confusing.
Right now the driver is using userspace governor by default.

polling_ms was also dropped as it's not needed for non-ondemand
governor.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-05-21 13:16:10 +09:00

166 lines
4.0 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP
*/
#include <linux/clk.h>
#include <linux/devfreq.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct imx_bus {
struct devfreq_dev_profile profile;
struct devfreq *devfreq;
struct clk *clk;
struct platform_device *icc_pdev;
};
static int imx_bus_target(struct device *dev,
unsigned long *freq, u32 flags)
{
struct dev_pm_opp *new_opp;
int ret;
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
ret = PTR_ERR(new_opp);
dev_err(dev, "failed to get recommended opp: %d\n", ret);
return ret;
}
dev_pm_opp_put(new_opp);
return dev_pm_opp_set_rate(dev, *freq);
}
static int imx_bus_get_cur_freq(struct device *dev, unsigned long *freq)
{
struct imx_bus *priv = dev_get_drvdata(dev);
*freq = clk_get_rate(priv->clk);
return 0;
}
static void imx_bus_exit(struct device *dev)
{
struct imx_bus *priv = dev_get_drvdata(dev);
dev_pm_opp_of_remove_table(dev);
platform_device_unregister(priv->icc_pdev);
}
/* imx_bus_init_icc() - register matching icc provider if required */
static int imx_bus_init_icc(struct device *dev)
{
struct imx_bus *priv = dev_get_drvdata(dev);
const char *icc_driver_name;
if (!of_get_property(dev->of_node, "#interconnect-cells", 0))
return 0;
if (!IS_ENABLED(CONFIG_INTERCONNECT_IMX)) {
dev_warn(dev, "imx interconnect drivers disabled\n");
return 0;
}
icc_driver_name = of_device_get_match_data(dev);
if (!icc_driver_name) {
dev_err(dev, "unknown interconnect driver\n");
return 0;
}
priv->icc_pdev = platform_device_register_data(
dev, icc_driver_name, -1, NULL, 0);
if (IS_ERR(priv->icc_pdev)) {
dev_err(dev, "failed to register icc provider %s: %ld\n",
icc_driver_name, PTR_ERR(priv->icc_pdev));
return PTR_ERR(priv->icc_pdev);
}
return 0;
}
static int imx_bus_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct imx_bus *priv;
const char *gov = DEVFREQ_GOV_USERSPACE;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/*
* Fetch the clock to adjust but don't explicitly enable.
*
* For imx bus clock clk_set_rate is safe no matter if the clock is on
* or off and some peripheral side-buses might be off unless enabled by
* drivers for devices on those specific buses.
*
* Rate adjustment on a disabled bus clock just takes effect later.
*/
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
ret = PTR_ERR(priv->clk);
dev_err(dev, "failed to fetch clk: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, priv);
ret = dev_pm_opp_of_add_table(dev);
if (ret < 0) {
dev_err(dev, "failed to get OPP table\n");
return ret;
}
priv->profile.target = imx_bus_target;
priv->profile.exit = imx_bus_exit;
priv->profile.get_cur_freq = imx_bus_get_cur_freq;
priv->profile.initial_freq = clk_get_rate(priv->clk);
priv->devfreq = devm_devfreq_add_device(dev, &priv->profile,
gov, NULL);
if (IS_ERR(priv->devfreq)) {
ret = PTR_ERR(priv->devfreq);
dev_err(dev, "failed to add devfreq device: %d\n", ret);
goto err;
}
ret = imx_bus_init_icc(dev);
if (ret)
goto err;
return 0;
err:
dev_pm_opp_of_remove_table(dev);
return ret;
}
static const struct of_device_id imx_bus_of_match[] = {
{ .compatible = "fsl,imx8mq-noc", .data = "imx8mq-interconnect", },
{ .compatible = "fsl,imx8mm-noc", .data = "imx8mm-interconnect", },
{ .compatible = "fsl,imx8mn-noc", .data = "imx8mn-interconnect", },
{ .compatible = "fsl,imx8m-noc", },
{ .compatible = "fsl,imx8m-nic", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, imx_bus_of_match);
static struct platform_driver imx_bus_platdrv = {
.probe = imx_bus_probe,
.driver = {
.name = "imx-bus-devfreq",
.of_match_table = imx_bus_of_match,
},
};
module_platform_driver(imx_bus_platdrv);
MODULE_DESCRIPTION("Generic i.MX bus frequency scaling driver");
MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
MODULE_LICENSE("GPL v2");