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Message-ID: <3d30fe7f61b558d3c2c8214e0e936903657f8231.camel@mediatek.com>
Date: Fri, 11 Feb 2022 11:51:07 +0800
From: Dawei Chien <dawei.chien@...iatek.com>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Georgi Djakov <georgi.djakov@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Stephen Boyd <swboyd@...omium.org>,
Ryan Case <ryandcase@...omium.org>
CC: Mark Rutland <mark.rutland@....com>,
Nicolas Boichat <drinkcat@...gle.com>,
<devicetree@...r.kernel.org>, <linux-pm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>,
Fan Chen <fan.chen@...iatek.com>,
Arvin Wang <arvin.wang@...iatek.com>,
"James Liao" <jamesjj.liao@...iatek.com>,
Henry Chen <henryc.chen@...iatek.com>
Subject: Re: [V11,PATCH 04/19] soc: mediatek: add driver for dvfsrc support
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@...iatek.com>
> >
> > Add dvfsrc driver for MT6873/MT8183/MT8192
> >
> > Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
> > Signed-off-by: Dawei Chien <dawei.chien@...iatek.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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