[V11,PATCH 04/19] soc: mediatek: add driver for dvfsrc support

Dawei Chien dawei.chien at mediatek.com
Thu Feb 10 19:51:07 PST 2022


On Thu, 2022-02-03 at 16:04 +0100, AngeloGioacchino Del Regno wrote:
> Il 12/08/21 10:58, Dawei Chien ha scritto:
> > From: Henry Chen <henryc.chen at mediatek.com>
> > 
> > Add dvfsrc driver for MT6873/MT8183/MT8192
> > 
> > Signed-off-by: Henry Chen <henryc.chen at mediatek.com>
> > Signed-off-by: Dawei Chien <dawei.chien at mediatek.com>
> > ---
> >   drivers/soc/mediatek/Kconfig            |  11 +
> >   drivers/soc/mediatek/Makefile           |   1 +
> >   drivers/soc/mediatek/mtk-dvfsrc.c       | 421
> > ++++++++++++++++++++++++++++++++
> >   include/linux/soc/mediatek/mtk_dvfsrc.h |  35 +++
> >   4 files changed, 468 insertions(+)
> >   create mode 100644 drivers/soc/mediatek/mtk-dvfsrc.c
> >   create mode 100644 include/linux/soc/mediatek/mtk_dvfsrc.h
> > 
> > diff --git a/drivers/soc/mediatek/Kconfig
> > b/drivers/soc/mediatek/Kconfig
> > index fdd8bc08569e..2dcf02384639 100644
> > --- a/drivers/soc/mediatek/Kconfig
> > +++ b/drivers/soc/mediatek/Kconfig
> > @@ -26,6 +26,17 @@ config MTK_DEVAPC
> >   	  The violation information is logged for further analysis or
> >   	  countermeasures.
> >   
> > +config MTK_DVFSRC
> > +	tristate "MediaTek DVFSRC Support"
> > +	depends on ARCH_MEDIATEK
> > +	help
> > +	  Say yes here to add support for the MediaTek DVFSRC (dynamic
> > voltage
> > +	  and frequency scaling resource collector) found
> > +	  on different MediaTek SoCs. The DVFSRC is a proprietary
> > +	  hardware which is used to collect all the requests from
> > +	  system and turn into the decision of minimum Vcore voltage
> > +	  and minimum DRAM frequency to fulfill those requests.
> > +
> >   config MTK_INFRACFG
> >   	bool "MediaTek INFRACFG Support"
> >   	select REGMAP
> > diff --git a/drivers/soc/mediatek/Makefile
> > b/drivers/soc/mediatek/Makefile
> > index 90270f8114ed..365d14fd7d49 100644
> > --- a/drivers/soc/mediatek/Makefile
> > +++ b/drivers/soc/mediatek/Makefile
> > @@ -1,6 +1,7 @@
> >   # SPDX-License-Identifier: GPL-2.0-only
> >   obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
> >   obj-$(CONFIG_MTK_DEVAPC) += mtk-devapc.o
> > +obj-$(CONFIG_MTK_DVFSRC) += mtk-dvfsrc.o
> >   obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
> >   obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
> >   obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
> > diff --git a/drivers/soc/mediatek/mtk-dvfsrc.c
> > b/drivers/soc/mediatek/mtk-dvfsrc.c
> > new file mode 100644
> > index 000000000000..6ef167cf55bd
> > --- /dev/null
> > +++ b/drivers/soc/mediatek/mtk-dvfsrc.c
> > @@ -0,0 +1,421 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2021 MediaTek Inc.
> > + */
> > +
> > +#include <linux/arm-smccc.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/module.h>
> > +#include <linux/notifier.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/soc/mediatek/mtk_dvfsrc.h>
> > +#include <linux/soc/mediatek/mtk_sip_svc.h>
> > +
> > +#define DVFSRC_IDLE     0x00
> > +#define DVFSRC_GET_TARGET_LEVEL(x)  (((x) >> 0) & 0x0000ffff)
> > +#define DVFSRC_GET_CURRENT_LEVEL(x) (((x) >> 16) & 0x0000ffff)
> > +#define kbps_to_mbps(x) ((x) / 1000)
> > +
> > +#define POLL_TIMEOUT        1000
> > +#define STARTUP_TIME        1
> > +
> > +#define MTK_SIP_DVFSRC_INIT		0x00
> > +
> > +#define DVFSRC_OPP_DESC(_opp_table)	\
> > +{	\
> > +	.opps = _opp_table,	\
> > +	.num_opp = ARRAY_SIZE(_opp_table),	\
> > +}
> > +
> > +struct dvfsrc_opp {
> > +	u32 vcore_opp;
> > +	u32 dram_opp;
> > +};
> > +
> > +struct dvfsrc_opp_desc {
> > +	const struct dvfsrc_opp *opps;
> > +	u32 num_opp;
> > +};
> > +
> > +struct mtk_dvfsrc;
> > +struct dvfsrc_soc_data {
> > +	const int *regs;
> > +	const struct dvfsrc_opp_desc *opps_desc;
> > +	int (*get_target_level)(struct mtk_dvfsrc *dvfsrc);
> > +	int (*get_current_level)(struct mtk_dvfsrc *dvfsrc);
> > +	u32 (*get_vcore_level)(struct mtk_dvfsrc *dvfsrc);
> > +	u32 (*get_vcp_level)(struct mtk_dvfsrc *dvfsrc);
> > +	void (*set_dram_bw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
> > +	void (*set_dram_peak_bw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
> > +	void (*set_dram_hrtbw)(struct mtk_dvfsrc *dvfsrc, u64 bw);
> > +	void (*set_opp_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
> > +	void (*set_vcore_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
> > +	void (*set_vscp_level)(struct mtk_dvfsrc *dvfsrc, u32 level);
> > +	int (*wait_for_opp_level)(struct mtk_dvfsrc *dvfsrc, u32
> > level);
> > +	int (*wait_for_vcore_level)(struct mtk_dvfsrc *dvfsrc, u32
> > level);
> > +};
> > +
> > +struct mtk_dvfsrc {
> > +	struct device *dev;
> > +	struct platform_device *icc;
> > +	struct platform_device *regulator;
> > +	const struct dvfsrc_soc_data *dvd;
> > +	int dram_type;
> > +	const struct dvfsrc_opp_desc *curr_opps;
> > +	void __iomem *regs;
> > +	spinlock_t req_lock;
> > +	struct mutex pstate_lock;
> > +	struct notifier_block scpsys_notifier;
> > +};
> > +
> > +static u32 dvfsrc_read(struct mtk_dvfsrc *dvfs, u32 offset)
> > +{
> > +	return readl(dvfs->regs + dvfs->dvd->regs[offset]);
> > +}
> > +
> > +static void dvfsrc_write(struct mtk_dvfsrc *dvfs, u32 offset, u32
> > val)
> > +{
> > +	writel(val, dvfs->regs + dvfs->dvd->regs[offset]);
> > +}
> > +
> > +#define dvfsrc_rmw(dvfs, offset, val, mask, shift) \
> > +	dvfsrc_write(dvfs, offset, \
> > +		(dvfsrc_read(dvfs, offset) & ~(mask << shift)) | (val
> > << shift))
> > +
> 
> Hello Dawei,
> 
> is there any reason why you're not using regmap-mmio here?
> If your concern is about regmap locking overhead, you can disable it
> by
> setting disable_locking as true in the regmap_config.
> 

Thank you for your review, I would use regmap-mmio to access register
on next version.

> > +enum dvfsrc_regs {
> > +	DVFSRC_SW_REQ,
> > +	DVFSRC_SW_REQ2,
> > +	DVFSRC_LEVEL,
> > +	DVFSRC_TARGET_LEVEL,
> > +	DVFSRC_SW_BW,
> > +	DVFSRC_SW_PEAK_BW,
> > +	DVFSRC_SW_HRT_BW,
> > +	DVFSRC_VCORE_REQUEST,
> > +};
> > +
> > +static const int mt8183_regs[] = {
> > +	[DVFSRC_SW_REQ] =	0x4,
> > +	[DVFSRC_SW_REQ2] =	0x8,
> > +	[DVFSRC_LEVEL] =	0xDC,
> > +	[DVFSRC_SW_BW] =	0x160,
> > +};
> > +
> > +static const struct dvfsrc_opp *get_current_opp(struct mtk_dvfsrc
> > *dvfsrc)
> > +{
> > +	int level;
> 
> 	int level = dvfsrc->dvd->get_current_level(dvfsrc);
> 
> > +
> > +	level = dvfsrc->dvd->get_current_level(dvfsrc);
> > +	return &dvfsrc->curr_opps->opps[level];
> > +}
> > +
> > +static int dvfsrc_is_idle(struct mtk_dvfsrc *dvfsrc)
> > +{
> > +	if (!dvfsrc->dvd->get_target_level)
> > +		return true;
> > +
> > +	return dvfsrc->dvd->get_target_level(dvfsrc);
> > +}
> > +
> > +static int dvfsrc_wait_for_vcore_level(struct mtk_dvfsrc *dvfsrc,
> > u32 level)
> > +{
> > +	const struct dvfsrc_opp *curr;
> > +
> > +	return readx_poll_timeout_atomic(get_current_opp, dvfsrc, curr,
> > +					 curr->vcore_opp >= level,
> > STARTUP_TIME,
> > +					 POLL_TIMEOUT);
> > +}
> > +
> > +static int mt8183_wait_for_opp_level(struct mtk_dvfsrc *dvfsrc,
> > u32 level)
> > +{
> > +	const struct dvfsrc_opp *target, *curr;
> > +	int ret;
> > +
> > +	target = &dvfsrc->curr_opps->opps[level];
> > +	ret = readx_poll_timeout(get_current_opp, dvfsrc, curr,
> > +				 curr->dram_opp >= target->dram_opp &&
> > +				 curr->vcore_opp >= target->vcore_opp,
> > +				 STARTUP_TIME, POLL_TIMEOUT);
> > +	if (ret < 0) {
> > +		dev_warn(dvfsrc->dev,
> > +			 "timeout, target: %u, dram: %d, vcore: %d\n",
> > level,
> > +			 curr->dram_opp, curr->vcore_opp);
> > +		return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int mt8183_get_target_level(struct mtk_dvfsrc *dvfsrc)
> > +{
> > +	return DVFSRC_GET_TARGET_LEVEL(dvfsrc_read(dvfsrc,
> > DVFSRC_LEVEL));
> > +}
> > +
> > +static int mt8183_get_current_level(struct mtk_dvfsrc *dvfsrc)
> > +{
> > +	int level;
> > +
> > +	/* HW level 0 is begin from 0x10000 */
> > +	level = DVFSRC_GET_CURRENT_LEVEL(dvfsrc_read(dvfsrc,
> > DVFSRC_LEVEL));
> > +	/* Array index start from 0 */
> > +	return ffs(level) - 1;
> > +}
> > +
> > +static u32 mt8183_get_vcore_level(struct mtk_dvfsrc *dvfsrc)
> > +{
> > +	return (dvfsrc_read(dvfsrc, DVFSRC_SW_REQ2) >> 2) & 0x3;
> > +}
> > +
> > +static void mt8183_set_dram_bw(struct mtk_dvfsrc *dvfsrc, u64 bw)
> > +{
> 
> Is there any min/max allowed bw? If there is, please add a boudary
> check here.
> Same for set_vcore_level.
> 

I would add a boundary check here on next version.

> > +	dvfsrc_write(dvfsrc, DVFSRC_SW_BW, div_u64(kbps_to_mbps(bw),
> > 100));
> > +}
> > +
> > +static void mt8183_set_opp_level(struct mtk_dvfsrc *dvfsrc, u32
> > level)
> > +{
> > +	int vcore_opp, dram_opp;
> > +	const struct dvfsrc_opp *opp;
> > +
> > +	/* translate pstate to dvfsrc level, and set it to DVFSRC HW */
> > +	opp = &dvfsrc->curr_opps->opps[level];
> > +	vcore_opp = opp->vcore_opp;
> > +	dram_opp = opp->dram_opp;
> > +
> > +	dev_dbg(dvfsrc->dev, "vcore_opp: %d, dram_opp: %d\n",
> > +		vcore_opp, dram_opp);
> > +	dvfsrc_write(dvfsrc, DVFSRC_SW_REQ, dram_opp | vcore_opp << 2);
> > +}
> > +
> > +static void mt8183_set_vcore_level(struct mtk_dvfsrc *dvfsrc, u32
> > level)
> > +{
> > +	dvfsrc_write(dvfsrc, DVFSRC_SW_REQ2, level << 2);
> > +}
> > +
> > +void mtk_dvfsrc_send_request(const struct device *dev, u32 cmd,
> > u64 data)
> 
> int mtk_dvfsrc_send_request(......
> 

I would update this on next version

> > +{
> > +	int ret, state;
> > +	struct mtk_dvfsrc *dvfsrc = dev_get_drvdata(dev);
> > +
> > +	dev_dbg(dvfsrc->dev, "cmd: %d, data: %llu\n", cmd, data);
> > +
> > +	switch (cmd) {
> > +	case MTK_DVFSRC_CMD_BW_REQUEST:
> > +		dvfsrc->dvd->set_dram_bw(dvfsrc, data);
> > +		return;
> > +	case MTK_DVFSRC_CMD_PEAK_BW_REQUEST:
> > +		if (dvfsrc->dvd->set_dram_peak_bw)
> > +			dvfsrc->dvd->set_dram_peak_bw(dvfsrc, data);
> > +		return;
> > +	case MTK_DVFSRC_CMD_OPP_REQUEST:
> > +		if (dvfsrc->dvd->set_opp_level)
> > +			dvfsrc->dvd->set_opp_level(dvfsrc, data);
> > +		break;
> > +	case MTK_DVFSRC_CMD_VCORE_REQUEST:
> > +		dvfsrc->dvd->set_vcore_level(dvfsrc, data);
> > +		break;
> > +	case MTK_DVFSRC_CMD_HRTBW_REQUEST:
> > +		if (dvfsrc->dvd->set_dram_hrtbw)
> > +			dvfsrc->dvd->set_dram_hrtbw(dvfsrc, data);
> > +		else
> > +			return;
> 
> 			return -EINVAL;
> 

I would update this on next version

> > +		break;
> > +	case MTK_DVFSRC_CMD_VSCP_REQUEST:
> > +		dvfsrc->dvd->set_vscp_level(dvfsrc, data);
> > +		break;
> > +	default:
> > +		dev_err(dvfsrc->dev, "unknown command: %d\n", cmd);
> > +		return;
> 
> 		return -EINVAL;
> 

I would update this on next version

> > +	}
> > +
> > +	/* DVFSRC needs to wait at least 2T(~196ns) to handle request
> > +	 * after receiving command
> > +	 */
> > +	udelay(STARTUP_TIME);
> > +
> > +	ret = readx_poll_timeout(dvfsrc_is_idle, dvfsrc,
> > +				 state, state == DVFSRC_IDLE,
> > +				 STARTUP_TIME, POLL_TIMEOUT);
> > +
> > +	if (ret < 0) {
> > +		dev_warn(dvfsrc->dev,
> > +			 "%d: idle timeout, data: %llu, last: %d ->
> > %d\n",
> > +			 cmd, data,
> > +			 dvfsrc->dvd->get_current_level(dvfsrc),
> > +			 dvfsrc->dvd->get_target_level(dvfsrc));
> > +		return;
> 
> 		return ret;
> 

I would update this on next version

> > +	}
> > +
> > +	/* The previous change may be requested by previous request.
> > +	 * So we delay 1us, then start checking opp is reached enough.
> > +	 */
> > +	udelay(STARTUP_TIME);
> > +
> > +	if (cmd == MTK_DVFSRC_CMD_OPP_REQUEST)
> > +		ret = dvfsrc->dvd->wait_for_opp_level(dvfsrc, data);
> > +	else
> > +		ret = dvfsrc->dvd->wait_for_vcore_level(dvfsrc, data);
> > +
> > +	if (ret < 0) {
> > +		dev_warn(dvfsrc->dev,
> > +			 "%d: wait timeout, data: %llu, last: %d ->
> > %d\n",
> > +			 cmd, data,
> > +			 dvfsrc->dvd->get_current_level(dvfsrc),
> > +			 dvfsrc->dvd->get_target_level(dvfsrc));
> > +	}
> > +
> > +}
> > +EXPORT_SYMBOL(mtk_dvfsrc_send_request);
> > +
> > +int mtk_dvfsrc_query_info(const struct device *dev, u32 cmd, int
> > *data)
> > +{
> > +	struct mtk_dvfsrc *dvfsrc = dev_get_drvdata(dev);
> > +
> > +	switch (cmd) {
> > +	case MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY:
> > +		*data = dvfsrc->dvd->get_vcore_level(dvfsrc);
> > +		break;
> > +	case MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY:
> > +		*data = dvfsrc->dvd->get_vcp_level(dvfsrc);
> > +		break;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(mtk_dvfsrc_query_info);
> > +
> > +static int mtk_dvfsrc_probe(struct platform_device *pdev)
> > +{
> > +	struct arm_smccc_res ares;
> > +	struct resource *res;
> > +	struct mtk_dvfsrc *dvfsrc;
> > +	int ret;
> > +
> > +	dvfsrc = devm_kzalloc(&pdev->dev, sizeof(*dvfsrc), GFP_KERNEL);
> > +	if (!dvfsrc)
> > +		return -ENOMEM;
> > +
> > +	dvfsrc->dvd = of_device_get_match_data(&pdev->dev);
> > +	dvfsrc->dev = &pdev->dev;
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	dvfsrc->regs = devm_ioremap_resource(&pdev->dev, res);
> > +	if (IS_ERR(dvfsrc->regs))
> > +		return PTR_ERR(dvfsrc->regs);
> > +
> > +	spin_lock_init(&dvfsrc->req_lock);
> > +	mutex_init(&dvfsrc->pstate_lock);
> > +
> > +	arm_smccc_smc(MTK_SIP_VCOREFS_CONTROL, MTK_SIP_DVFSRC_INIT, 0,
> > 0, 0,
> > +		0, 0, 0, &ares);
> > +
> > +	if (!ares.a0) {
> > +		dvfsrc->dram_type = ares.a1;
> > +		dev_info(dvfsrc->dev, "dram_type: %d\n", dvfsrc-
> > >dram_type);
> > +	} else {
> > +		dev_err(dvfsrc->dev, "init fails: %lu\n", ares.a0);
> > +		return ares.a0;
> > +	}
> > +
> > +	dvfsrc->curr_opps = &dvfsrc->dvd->opps_desc[dvfsrc->dram_type];
> > +	platform_set_drvdata(pdev, dvfsrc);
> > +
> > +	dvfsrc->regulator = platform_device_register_data(dvfsrc->dev,
> > +			"mtk-dvfsrc-regulator", -1, NULL, 0);
> 
> Why are you registering platform devices like this?
> 
> Please use device-tree instead.
> 

Thank you for advisement. Let me just describe history.

Actually, we did use device-tree to probe interconnect/regulator driver
in v4, and reviewer had some advisement


https://patchwork.kernel.org/project/linux-mediatek/patch/1584092066-24425-12-git-send-email-henryc.chen@mediatek.com/#23243049

https://patchwork.kernel.org/project/linux-mediatek/patch/1584092066-24425-9-git-send-email-henryc.chen@mediatek.com/#23236945

so we refer to this driver to use platform_device_register_data after
v5.

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/soc/qcom/smd-rpm.c?h=next-20220209#n213

Would you kindly give your advisement, thank you.

> > +	if (IS_ERR(dvfsrc->regulator)) {
> > +		dev_err(dvfsrc->dev, "Failed create regulator
> > device\n");
> > +		ret = PTR_ERR(dvfsrc->regulator);
> > +		goto err;
> > +	}
> > +
> > +	dvfsrc->icc = platform_device_register_data(dvfsrc->dev,
> > +			"mediatek-emi-icc", -1, NULL, 0);
> 
> Same here.
> 
> > +	if (IS_ERR(dvfsrc->icc)) {
> > +		dev_err(dvfsrc->dev, "Failed create icc device\n");
> 
> As a side note, after applying the suggested flow, you will also be
> able
> to use dev_err_probe() instead, simplifying this probe function.
> 

I would update this on next version

> > +		ret = PTR_ERR(dvfsrc->icc);
> > +		goto unregister_regulator;
> > +	}
> > +
> > +	ret = devm_of_platform_populate(&pdev->dev);
> > +	if (ret)
> > +		platform_device_unregister(dvfsrc->icc);
> > +
> > +	return 0;
> > +
> > +unregister_regulator:
> > +	platform_device_unregister(dvfsrc->regulator);
> > +err:
> > +	return ret;
> > +}
> > +
> > +static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp4[] = {
> > +	{0, 0}, {0, 1}, {0, 2}, {1, 2},
> > +};
> > +
> > +static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp3[] = {
> > +	{0, 0}, {0, 1}, {1, 1}, {1, 2},
> > +};
> > +
> > +static const struct dvfsrc_opp_desc dvfsrc_opp_mt8183_desc[] = {
> > +	DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp4),
> > +	DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp3),
> > +	DVFSRC_OPP_DESC(dvfsrc_opp_mt8183_lp3),
> > +};
> > +
> > +static const struct dvfsrc_soc_data mt8183_data = {
> > +	.opps_desc = dvfsrc_opp_mt8183_desc,
> > +	.regs = mt8183_regs,
> > +	.get_target_level = mt8183_get_target_level,
> > +	.get_current_level = mt8183_get_current_level,
> > +	.get_vcore_level = mt8183_get_vcore_level,
> > +	.set_dram_bw = mt8183_set_dram_bw,
> > +	.set_opp_level = mt8183_set_opp_level,
> > +	.set_vcore_level = mt8183_set_vcore_level,
> > +	.wait_for_opp_level = mt8183_wait_for_opp_level,
> > +	.wait_for_vcore_level = dvfsrc_wait_for_vcore_level,
> > +};
> > +
> > +static int mtk_dvfsrc_remove(struct platform_device *pdev)
> > +{
> > +	struct mtk_dvfsrc *dvfsrc = platform_get_drvdata(pdev);
> > +
> > +	platform_device_unregister(dvfsrc->regulator);
> > +	platform_device_unregister(dvfsrc->icc);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id mtk_dvfsrc_of_match[] = {
> > +	{
> > +		.compatible = "mediatek,mt8183-dvfsrc",
> > +		.data = &mt8183_data,
> > +	}, {
> > +		/* sentinel */
> > +	},
> > +};
> > +
> > +static struct platform_driver mtk_dvfsrc_driver = {
> > +	.probe	= mtk_dvfsrc_probe,
> > +	.remove	= mtk_dvfsrc_remove,
> > +	.driver = {
> > +		.name = "mtk-dvfsrc",
> > +		.of_match_table = of_match_ptr(mtk_dvfsrc_of_match),
> > +	},
> > +};
> > +
> > +static int __init mtk_dvfsrc_init(void)
> > +{
> > +	return platform_driver_register(&mtk_dvfsrc_driver);
> > +}
> > +subsys_initcall(mtk_dvfsrc_init);
> > +
> > +static void __exit mtk_dvfsrc_exit(void)
> > +{
> > +	platform_driver_unregister(&mtk_dvfsrc_driver);
> > +}
> > +module_exit(mtk_dvfsrc_exit);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("MTK DVFSRC driver");
> > diff --git a/include/linux/soc/mediatek/mtk_dvfsrc.h
> > b/include/linux/soc/mediatek/mtk_dvfsrc.h
> > new file mode 100644
> > index 000000000000..823eff9bb19f
> > --- /dev/null
> > +++ b/include/linux/soc/mediatek/mtk_dvfsrc.h
> > @@ -0,0 +1,35 @@
> > +/* SPDX-License-Identifier: GPL-2.0
> > + *
> > + * Copyright (c) 2021 MediaTek Inc.
> > + */
> > +
> > +#ifndef __SOC_MTK_DVFSRC_H
> > +#define __SOC_MTK_DVFSRC_H
> > +
> > +#define MTK_DVFSRC_CMD_BW_REQUEST		0
> > +#define MTK_DVFSRC_CMD_OPP_REQUEST		1
> > +#define MTK_DVFSRC_CMD_VCORE_REQUEST		2
> > +#define MTK_DVFSRC_CMD_HRTBW_REQUEST		3
> > +#define MTK_DVFSRC_CMD_VSCP_REQUEST		4
> > +#define MTK_DVFSRC_CMD_PEAK_BW_REQUEST		5
> > +
> > +#define MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY	0
> > +#define MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY		1
> > +
> > +#if IS_ENABLED(CONFIG_MTK_DVFSRC)
> > +void mtk_dvfsrc_send_request(const struct device *dev, u32 cmd,
> > u64 data);
> > +int mtk_dvfsrc_query_info(const struct device *dev, u32 cmd, int
> > *data);
> > +
> > +#else
> > +
> > +static inline void mtk_dvfsrc_send_request(const struct device
> > *dev, u32 cmd,
> > +					   u64 data)
> > +{ return -ENODEV; }
> > +
> > +static inline int mtk_dvfsrc_query_info(const struct device *dev,
> > u32 cmd,
> > +					int *data);
> > +{ return -ENODEV; }
> > +
> > +#endif /* CONFIG_MTK_DVFSRC */
> > +
> > +#endif




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