Re: [RFC PATCH 6/7] soc: mediatek: add MT8183 dvfsrc support

From: Nicolas Boichat
Date: Wed Jan 02 2019 - 21:17:13 EST

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In reply to: Henry Chen: "[RFC PATCH 6/7] soc: mediatek: add MT8183 dvfsrc support"
Next in thread: Henry Chen: "Re: [RFC PATCH 6/7] soc: mediatek: add MT8183 dvfsrc support"
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On Wed, Jan 2, 2019 at 10:01 PM Henry Chen <henryc.chen@xxxxxxxxxxxx> wrote:
>
> Add dvfsrc driver for MT8183
>
> Signed-off-by: Henry Chen <henryc.chen@xxxxxxxxxxxx>
> ---
> drivers/soc/mediatek/Kconfig | 15 ++
> drivers/soc/mediatek/Makefile | 1 +
> drivers/soc/mediatek/mtk-dvfsrc.c | 473 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 489 insertions(+)
> create mode 100644 drivers/soc/mediatek/mtk-dvfsrc.c
>
> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> index a7d0667..f956f03 100644
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -12,6 +12,21 @@ config MTK_INFRACFG
> INFRACFG controller contains various infrastructure registers not
> directly associated to any device.
>
> +config MTK_DVFSRC
> + bool "MediaTek DVFSRC Support"
> + depends on ARCH_MEDIATEK
> + default ARCH_MEDIATEK
> + select REGMAP
> + select MTK_INFRACFG
> + select PM_GENERIC_DOMAINS if PM
> + depends on MTK_SCPSYS
> + help
> + Say yes here to add support for the MediaTek DVFSRC 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_PMIC_WRAP
> tristate "MediaTek PMIC Wrapper Support"
> depends on RESET_CONTROLLER
> diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> index 9dc6670..5c010b9 100644
> --- a/drivers/soc/mediatek/Makefile
> +++ b/drivers/soc/mediatek/Makefile
> @@ -1,3 +1,4 @@
> +obj-$(CONFIG_MTK_DVFSRC) += mtk-dvfsrc.o
> obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o mtk-scpsys-ext.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 0000000..af462a3
> --- /dev/null
> +++ b/drivers/soc/mediatek/mtk-dvfsrc.c
> @@ -0,0 +1,473 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 MediaTek Inc.
> + */
> +#include <linux/arm-smccc.h>
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/delay.h>

Alphabetical order.

> +#include <linux/kthread.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_qos.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <soc/mediatek/mtk_sip.h>
> +#include <dt-bindings/power/mt8183-power.h>
> +#include <dt-bindings/soc/mtk,dvfsrc.h>
> +#include "mtk-scpsys.h"
> +
> +#define DVFSRC_IDLE 0x00
> +#define DVFSRC_GET_TARGET_LEVEL(x) (((x) >> 0) & 0x0000ffff)
> +#define DVFSRC_GET_CURRENT_LEVEL(x) (((x) >> 16) & 0x0000ffff)
> +
> +/* macro for irq */
> +#define DVFSRC_IRQ_TIMEOUT_EN BIT(1)
> +
> +struct dvfsrc_opp {
> + int vcore_opp;
> + int dram_opp;
> +};
> +
> +struct dvfsrc_domain {
> + int id;
> + int state;
> +};
> +
> +struct mtk_dvfsrc;
> +struct dvfsrc_soc_data {
> + const int *regs;
> + int num_opp;
> + int num_domains;
> + int dram_sft;
> + int vcore_sft;
> + const struct dvfsrc_opp **opps;
> + struct dvfsrc_domain *domains;
> + void (*init_soc)(struct mtk_dvfsrc *dvfsrc);
> + int (*get_target_level)(struct mtk_dvfsrc *dvfsrc);
> + int (*get_current_level)(struct mtk_dvfsrc *dvfsrc);
> +};
> +
> +struct mtk_dvfsrc {
> + struct device *dev;
> + struct clk *clk_dvfsrc;
> + const struct dvfsrc_soc_data *dvd;
> + int dram_type;
> + int irq;
> + void __iomem *regs;
> + struct mutex lock; /* generic mutex for dvfsrc driver */
> +
> + struct notifier_block qos_notifier;
> + 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]);
> +}
> +
> +enum dvfsrc_regs {
> + DVFSRC_BASIC_CONTROL,
> + DVFSRC_SW_REQ,
> + DVFSRC_SW_REQ2,
> + DVFSRC_EMI_REQUEST,
> + DVFSRC_EMI_REQUEST2,
> + DVFSRC_EMI_REQUEST3,
> + DVFSRC_EMI_QOS0,
> + DVFSRC_EMI_QOS1,
> + DVFSRC_EMI_QOS2,
> + DVFSRC_EMI_MD2SPM0,
> + DVFSRC_EMI_MD2SPM1,
> + DVFSRC_VCORE_REQUEST,
> + DVFSRC_VCORE_REQUEST2,
> + DVFSRC_VCORE_MD2SPM0,
> + DVFSRC_INT,
> + DVFSRC_INT_EN,
> + DVFSRC_INT_CLR,
> + DVFSRC_TIMEOUT_NEXTREQ,
> + DVFSRC_LEVEL,
> + DVFSRC_LEVEL_LABEL_0_1,
> + DVFSRC_LEVEL_LABEL_2_3,
> + DVFSRC_LEVEL_LABEL_4_5,
> + DVFSRC_LEVEL_LABEL_6_7,
> + DVFSRC_LEVEL_LABEL_8_9,
> + DVFSRC_LEVEL_LABEL_10_11,
> + DVFSRC_LEVEL_LABEL_12_13,
> + DVFSRC_LEVEL_LABEL_14_15,
> + DVFSRC_SW_BW_0,
> + DVFSRC_QOS_EN,
> + DVFSRC_FORCE,
> + DVFSRC_LAST,
> + DVFSRC_RSRV_0,
> + DVFSRC_RSRV_1,
> +};
> +
> +static int mt8183_regs[] = {
> + [DVFSRC_BASIC_CONTROL] = 0x0,
> + [DVFSRC_SW_REQ] = 0x4,
> + [DVFSRC_SW_REQ2] = 0x8,
> + [DVFSRC_EMI_REQUEST] = 0xC,
> + [DVFSRC_EMI_REQUEST2] = 0x10,
> + [DVFSRC_EMI_REQUEST3] = 0x14,
> + [DVFSRC_EMI_QOS0] = 0x24,
> + [DVFSRC_EMI_QOS1] = 0x28,
> + [DVFSRC_EMI_QOS2] = 0x2C,
> + [DVFSRC_EMI_MD2SPM0] = 0x30,
> + [DVFSRC_EMI_MD2SPM1] = 0x34,
> + [DVFSRC_VCORE_REQUEST] = 0x48,
> + [DVFSRC_VCORE_REQUEST2] = 0x4C,
> + [DVFSRC_VCORE_MD2SPM0] = 0x68,
> + [DVFSRC_INT] = 0x98,
> + [DVFSRC_INT_EN] = 0x9C,
> + [DVFSRC_INT_CLR] = 0xA0,
> + [DVFSRC_TIMEOUT_NEXTREQ] = 0xD8,
> + [DVFSRC_LEVEL] = 0xDC,
> + [DVFSRC_LEVEL_LABEL_0_1] = 0xE0,
> + [DVFSRC_LEVEL_LABEL_2_3] = 0xE4,
> + [DVFSRC_LEVEL_LABEL_4_5] = 0xE8,
> + [DVFSRC_LEVEL_LABEL_6_7] = 0xEC,
> + [DVFSRC_LEVEL_LABEL_8_9] = 0xF0,
> + [DVFSRC_LEVEL_LABEL_10_11] = 0xF4,
> + [DVFSRC_LEVEL_LABEL_12_13] = 0xF8,
> + [DVFSRC_LEVEL_LABEL_14_15] = 0xFC,
> + [DVFSRC_SW_BW_0] = 0x160,
> + [DVFSRC_QOS_EN] = 0x180,
> + [DVFSRC_FORCE] = 0x300,
> + [DVFSRC_LAST] = 0x308,
> + [DVFSRC_RSRV_0] = 0x600,
> + [DVFSRC_RSRV_1] = 0x604,
> +};

Why do you need this indirection table? Do you plan to support HW with
very different register offsets?

> +
> +static bool dvfsrc_is_idle(struct mtk_dvfsrc *dvfsrc)
> +{
> + int val = 0;

So 0 is DVFSRC_IDLE, so the function returns true?

Maybe this is more readable?

if (!dvfsrc->dvd->get_target_level)
return true;

return dvfsrc->dvd->get_target_level(dvfsrc) == DVFSRC_IDLE;

> +
> + if (dvfsrc->dvd->get_target_level)

However... can this be false? In what case?

> + val = dvfsrc->dvd->get_target_level(dvfsrc);
> +
> + return val == DVFSRC_IDLE;
> +}
> +
> +static int dvfsrc_wait_for_state(struct mtk_dvfsrc *dvfsrc,
> + bool (*fp)(struct mtk_dvfsrc *))
> +{
> + unsigned long timeout;
> +
> + timeout = jiffies + usecs_to_jiffies(1000);
> +
> + do {
> + if (fp(dvfsrc))
> + return 0;
> + } while (!time_after(jiffies, timeout));
> +
> + return -ETIMEDOUT;
> +}

Can we use wait_event_timeout here?

> +
> +static void mtk_dvfsrc_mt8183_init(struct mtk_dvfsrc *dvfsrc)
> +{
> + struct arm_smccc_res res;
> +
> + mutex_lock(&dvfsrc->lock);
> +
> + arm_smccc_smc(MTK_SIP_SPM, MTK_SIP_SPM_DVFSRC_INIT, 0, 0, 0, 0, 0, 0,
> + &res);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_0_1, 0x00100000);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_2_3, 0x00210011);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_4_5, 0x01100100);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_6_7, 0x01210111);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_8_9, 0x02100200);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_10_11, 0x02210211);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_12_13, 0x03210321);
> + dvfsrc_write(dvfsrc, DVFSRC_LEVEL_LABEL_14_15, 0x03210321);
> +
> + /* EMI/VCORE HRT, MD2SPM, BW setting */
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_QOS0, 0x32);
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_QOS1, 0x66);
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_MD2SPM0, 0x80F8);
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_MD2SPM1, 0x0);
> + dvfsrc_write(dvfsrc, DVFSRC_VCORE_MD2SPM0, 0x80C0);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_RSRV_1, 0x0000001C);
> + dvfsrc_write(dvfsrc, DVFSRC_TIMEOUT_NEXTREQ, 0x00000013);
> + dvfsrc_write(dvfsrc, DVFSRC_INT_EN, 0x2);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST, 0x00290209);
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST2, 0);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_VCORE_REQUEST, 0x00150000);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_QOS_EN, 0x0000407F);
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST3, 0x09000000);
> +
> + dvfsrc_write(dvfsrc, DVFSRC_FORCE, 0x00400000);
> + dvfsrc_write(dvfsrc, DVFSRC_BASIC_CONTROL, 0x0000C07B);
> + dvfsrc_write(dvfsrc, DVFSRC_BASIC_CONTROL, 0x0000017B);

Lots of magic values here, can you describe what they do? (either as
#define, or at the very least with comments)

> +
> + dvfsrc_write(dvfsrc, DVFSRC_VCORE_REQUEST,
> + (dvfsrc_read(dvfsrc, DVFSRC_VCORE_REQUEST)
> + & ~(0x3 << 20)));
> + dvfsrc_write(dvfsrc, DVFSRC_EMI_REQUEST,
> + (dvfsrc_read(dvfsrc, DVFSRC_EMI_REQUEST)
> + & ~(0x3 << 20)));
> +
> + mutex_unlock(&dvfsrc->lock);
> +}
> +
> +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)
> +{
> + return DVFSRC_GET_CURRENT_LEVEL(dvfsrc_read(dvfsrc, DVFSRC_LEVEL));
> +}
> +
> +static int get_cur_performance_level(struct mtk_dvfsrc *dvfsrc)
> +{
> + int bit = 0;
> +
> + if (dvfsrc->dvd->get_current_level)

Same question as above, is this possible?

> + bit = dvfsrc->dvd->get_current_level(dvfsrc);
> +
> + return ffs(bit);

So ffs(0) = 0... Maybe just return 0 if get_current_level is NULL.

> +}
> +
> +static int pm_qos_memory_bw_notify(struct notifier_block *b,
> + unsigned long bw, void *v)
> +{
> + struct mtk_dvfsrc *dvfsrc;
> +
> + dvfsrc = container_of(b, struct mtk_dvfsrc, qos_notifier);
> + mutex_lock(&dvfsrc->lock);
> +
> + dev_dbg(dvfsrc->dev, "data: 0x%lx\n", bw);
> + dvfsrc_write(dvfsrc, DVFSRC_SW_BW_0, bw / 100);
> +
> + mutex_unlock(&dvfsrc->lock);
> +
> + return NOTIFY_OK;
> +}
> +
> +static int dvfsrc_set_performace(struct notifier_block *b,

set_performaNce

> + unsigned long l, void *v)
> +{
> + int i, val, highest = 0, vcore_opp = 0, dram_opp = 0;

No need to initialize any of these to 0.

> + struct mtk_dvfsrc *dvfsrc;
> + struct scp_event_data *sc = v;
> + struct dvfsrc_domain *d;
> +
> + if (sc->event_type != MTK_SCPSYS_PSTATE)
> + return 0;
> +
> + dvfsrc = container_of(b, struct mtk_dvfsrc, scpsys_notifier);
> +
> + mutex_lock(&dvfsrc->lock);
> + d = dvfsrc->dvd->domains;
> +
> + if (l > dvfsrc->dvd->num_opp || l <= 0) {
> + dev_err(dvfsrc->dev, "pstate out of range = %ld\n", l);
> + goto out;
> + }
> +
> + for (i = 0, highest = 0; i < dvfsrc->dvd->num_domains - 1; i++, d++) {
> + if (sc->domain_id == d->id)
> + d->state = l;
> + if (d->state > highest)
> + highest = d->state;
> + }
> +
> + if (highest == 0) {
> + dev_err(dvfsrc->dev, "domain not match\n");
> + goto out;
> + }
> +
> + /* translate pstate to dvfsrc level, and set it to DVFSRC HW */
> + vcore_opp =
> + dvfsrc->dvd->opps[dvfsrc->dram_type][highest - 1].vcore_opp;
> + dram_opp = dvfsrc->dvd->opps[dvfsrc->dram_type][highest - 1].dram_opp;
> +
> + if (dvfsrc_wait_for_state(dvfsrc, dvfsrc_is_idle)) {
> + dev_warn(dvfsrc->dev, "[%s] wait idle, last: %d -> %d\n",
> + __func__, dvfsrc_read(dvfsrc, DVFSRC_LEVEL),
> + dvfsrc_read(dvfsrc, DVFSRC_LAST));
> + goto out;
> + }
> +
> + dvfsrc_write(dvfsrc, DVFSRC_SW_REQ,
> + dram_opp << dvfsrc->dvd->dram_sft |
> + vcore_opp << dvfsrc->dvd->vcore_sft);
> +
> + if (dvfsrc_wait_for_state(dvfsrc, dvfsrc_is_idle)) {
> + dev_warn(dvfsrc->dev, "[%s] wait idle, last: %d -> %d\n",
> + __func__, dvfsrc_read(dvfsrc, DVFSRC_LEVEL),
> + dvfsrc_read(dvfsrc, DVFSRC_LAST));
> + goto out;
> + }
> +
> + val = get_cur_performance_level(dvfsrc);
> + if (val < highest) {
> + dev_err(dvfsrc->dev, "current: %d < hightest: %x\n",

highest

> + highest, val);
> + }
> +out:
> + mutex_unlock(&dvfsrc->lock);
> +
> + return 0;
> +}
> +
> +static void pstate_notifier_register(struct mtk_dvfsrc *dvfsrc)
> +{
> + dvfsrc->scpsys_notifier.notifier_call = dvfsrc_set_performace;
> + register_scpsys_notifier(&dvfsrc->scpsys_notifier);
> +}
> +
> +static void pm_qos_notifier_register(struct mtk_dvfsrc *dvfsrc)
> +{
> + dvfsrc->qos_notifier.notifier_call = pm_qos_memory_bw_notify;
> + pm_qos_add_notifier(PM_QOS_MEMORY_BANDWIDTH, &dvfsrc->qos_notifier);
> +}
> +
> +static irqreturn_t mtk_dvfsrc_interrupt(int irq, void *dev_id)
> +{
> + u32 val;
> + struct mtk_dvfsrc *dvfsrc = dev_id;
> +
> + val = dvfsrc_read(dvfsrc, DVFSRC_INT);
> + dvfsrc_write(dvfsrc, DVFSRC_INT_CLR, val);
> + dvfsrc_write(dvfsrc, DVFSRC_INT_CLR, 0x0);
> + if (val & DVFSRC_IRQ_TIMEOUT_EN)
> + dev_warn(dvfsrc->dev, "timeout at spm = %x", val);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mtk_dvfsrc_probe(struct platform_device *pdev)
> +{
> + 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);
> +
> + dvfsrc->clk_dvfsrc = devm_clk_get(dvfsrc->dev, "dvfsrc");
> + if (IS_ERR(dvfsrc->clk_dvfsrc)) {
> + dev_err(dvfsrc->dev, "failed to get clock: %ld\n",
> + PTR_ERR(dvfsrc->clk_dvfsrc));
> + return PTR_ERR(dvfsrc->clk_dvfsrc);
> + }
> +
> + ret = clk_prepare_enable(dvfsrc->clk_dvfsrc);
> + if (ret)
> + return ret;
> +
> + ret = of_property_read_u32(dvfsrc->dev->of_node, "dram_type",
> + &dvfsrc->dram_type);
> + if (ret) {
> + dev_err(dvfsrc->dev, "failed to get dram_type: %d\n", ret);
> + clk_disable_unprepare(dvfsrc->clk_dvfsrc);
> + return ret;
> + }
> +
> + dvfsrc->irq = platform_get_irq(pdev, 0);
> + ret = request_irq(dvfsrc->irq, mtk_dvfsrc_interrupt
> + , IRQF_TRIGGER_HIGH, "dvfsrc", dvfsrc);

comma on the line above

> + if (ret)
> + dev_dbg(dvfsrc->dev, "interrupt not use\n");
> +
> + mutex_init(&dvfsrc->lock);
> + if (dvfsrc->dvd->init_soc)
> + dvfsrc->dvd->init_soc(dvfsrc);
> +
> + pstate_notifier_register(dvfsrc);
> + pm_qos_notifier_register(dvfsrc);
> + platform_set_drvdata(pdev, dvfsrc);
> +
> + return 0;
> +}
> +
> +static const struct dvfsrc_opp dvfsrc_opp_mt8183_lp4[] = {
> + {0, 0}, {1, 0}, {1, 1}, {1, 2},
> +};
> +
> +static const struct dvfsrc_opp dvfsrc_opp_mt8183_1p3[] = {
> + {0, 0}, {0, 1}, {1, 1}, {1, 2},
> +};

1p3? Should this be lp3?

> +
> +static const struct dvfsrc_opp *dvfsrc_opp_mt8183[] = {
> + [MT8183_DVFSRC_OPP_LP4] = dvfsrc_opp_mt8183_lp4,
> + [MT8183_DVFSRC_OPP_LP4X] = dvfsrc_opp_mt8183_1p3,
> + [MT8183_DVFSRC_OPP_LP3] = dvfsrc_opp_mt8183_1p3,
> +};
> +
> +static struct dvfsrc_domain dvfsrc_domains_mt8183[] = {
> + {MT8183_POWER_DOMAIN_MFG_ASYNC, 0},
> + {MT8183_POWER_DOMAIN_MFG, 0},
> + {MT8183_POWER_DOMAIN_CAM, 0},
> + {MT8183_POWER_DOMAIN_DISP, 0},
> + {MT8183_POWER_DOMAIN_ISP, 0},
> + {MT8183_POWER_DOMAIN_VDEC, 0},
> + {MT8183_POWER_DOMAIN_VENC, 0},
> +};
> +
> +static const struct dvfsrc_soc_data mt8183_data = {
> + .opps = dvfsrc_opp_mt8183,
> + .num_opp = ARRAY_SIZE(dvfsrc_opp_mt8183_lp4),
> + .regs = mt8183_regs,
> + .domains = dvfsrc_domains_mt8183,
> + .num_domains = ARRAY_SIZE(dvfsrc_domains_mt8183),
> + .init_soc = mtk_dvfsrc_mt8183_init,
> + .get_target_level = mt8183_get_target_level,
> + .get_current_level = mt8183_get_current_level,
> + .dram_sft = 0,
> + .vcore_sft = 2,
> +};
> +
> +static int mtk_dvfsrc_remove(struct platform_device *pdev)
> +{
> + return 0;

Should you at least disable the clock? (since you do it in the error
path in _probe...)

clk_disable_unprepare(dvfsrc->clk_dvfsrc);

> +}
> +
> +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),
> + },
> +};
> +
> +builtin_platform_driver(mtk_dvfsrc_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("MTK DVFSRC driver");
> --
> 1.9.1
>

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