Re: [PATCH v11 04/10] soc: mediatek: Add multiple step bus protection control

From: Matthias Brugger
Date: Tue Feb 11 2020 - 12:50:08 EST

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On 20/12/2019 04:45, Weiyi Lu wrote:
> Both MT8183 & MT6765 have more control steps of bus protection
> than previous project. And there add more bus protection registers
> reside at infracfg & smi-common. Also add new APIs for multiple
> step bus protection control with more customized arguments.
> And then use bp_table for bus protection of all compatibles,
> instead of mixing bus_prot_mask and bus_prot_reg_update.
>
> Signed-off-by: Weiyi Lu <weiyi.lu@xxxxxxxxxxxx>
> ---
> drivers/soc/mediatek/Makefile | 2 +-
> drivers/soc/mediatek/mtk-scpsys-ext.c | 101 +++++++++++++++++++++++++++++
> drivers/soc/mediatek/mtk-scpsys.c | 117 +++++++++++++++++++++-------------
> drivers/soc/mediatek/scpsys-ext.h | 67 +++++++++++++++++++
> 4 files changed, 240 insertions(+), 47 deletions(-)
> create mode 100644 drivers/soc/mediatek/mtk-scpsys-ext.c
> create mode 100644 drivers/soc/mediatek/scpsys-ext.h
>
> diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> index b017330..b442be9 100644
> --- a/drivers/soc/mediatek/Makefile
> +++ b/drivers/soc/mediatek/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
> -obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
> +obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o mtk-scpsys-ext.o

It seems that we would need another patch which get's rid of the mtk-infracfg
first and then add stuff like the possibility to have different steps.

> obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
> obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
> diff --git a/drivers/soc/mediatek/mtk-scpsys-ext.c b/drivers/soc/mediatek/mtk-scpsys-ext.c
> new file mode 100644
> index 0000000..df402ac
> --- /dev/null
> +++ b/drivers/soc/mediatek/mtk-scpsys-ext.c

I'm not quite sure why we should put this into a new file. I suppose the
rational behind it is the fact that we access other blocks through regmap.

> @@ -0,0 +1,101 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018 MediaTek Inc.
> + * Author: Owen Chen <Owen.Chen@xxxxxxxxxxxx>
> + */
> +#include <linux/ktime.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +#include "scpsys-ext.h"
> +
> +#define MTK_POLL_DELAY_US 10
> +#define MTK_POLL_TIMEOUT USEC_PER_SEC
> +
> +static int set_bus_protection(struct regmap *map, u32 mask,
> + u32 reg_set, u32 reg_sta, u32 reg_en)
> +{
> + u32 val;
> +
> + if (reg_set)
> + regmap_write(map, reg_set, mask);
> + else
> + regmap_update_bits(map, reg_en, mask, mask);
> +
> + return regmap_read_poll_timeout(map, reg_sta,
> + val, (val & mask) == mask,
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +}
> +
> +static int clear_bus_protection(struct regmap *map, u32 mask,
> + u32 reg_clr, u32 reg_sta, u32 reg_en, bool ignore_ack)
> +{
> + u32 val;
> +
> + if (reg_clr)
> + regmap_write(map, reg_clr, mask);
> + else
> + regmap_update_bits(map, reg_en, mask, 0);
> +
> + if (ignore_ack)
> + return 0;
> +
> + return regmap_read_poll_timeout(map, reg_sta,
> + val, !(val & mask),
> + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> +}
> +
> +int mtk_scpsys_ext_set_bus_protection(const struct bus_prot *bp_table,
> + struct regmap *infracfg, struct regmap *smi_common)
> +{
> + int i;
> +
> + for (i = 0; i < MAX_STEPS; i++) {

struct bus_prot bp_table = bp_table[i];

> + struct regmap *map = NULL;
> + int ret;
> +
> + if (bp_table[i].type == INVALID_TYPE)
> + break;
> + else if (bp_table[i].type == IFR_TYPE)
> + map = infracfg;
> + else if (bp_table[i].type == SMI_TYPE)
> + map = smi_common;

if (bp_table.type == IFR_TYPE)
map = infracfg;
else if (bp_table.type == SMI_TYPE)
map = smi_common;
else
break;

> +
> + ret = set_bus_protection(map,
> + bp_table[i].mask, bp_table[i].set_ofs,
> + bp_table[i].sta_ofs, bp_table[i].en_ofs);

passing map and bp_table here makes code much more readable. I always end-up
counting the variables when the names in the callee changes.

> +
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +int mtk_scpsys_ext_clear_bus_protection(const struct bus_prot *bp_table,
> + struct regmap *infracfg, struct regmap *smi_common)
> +{
> + int i;
> +
> + for (i = MAX_STEPS - 1; i >= 0; i--) {
> + struct regmap *map = NULL;
> + int ret;
> +
> + if (bp_table[i].type == INVALID_TYPE)
> + continue;
> + else if (bp_table[i].type == IFR_TYPE)
> + map = infracfg;
> + else if (bp_table[i].type == SMI_TYPE)
> + map = smi_common;
> +
> + ret = clear_bus_protection(map,
> + bp_table[i].mask, bp_table[i].clr_ofs,
> + bp_table[i].sta_ofs, bp_table[i].en_ofs,
> + bp_table[i].ignore_clr_ack);
> +

same here.

> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index db35a28..763ca58 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -11,7 +11,7 @@
> #include <linux/platform_device.h>
> #include <linux/pm_domain.h>
> #include <linux/regulator/consumer.h>
> -#include <linux/soc/mediatek/infracfg.h>
> +#include "scpsys-ext.h"
>
> #include <dt-bindings/power/mt2701-power.h>
> #include <dt-bindings/power/mt2712-power.h>
> @@ -87,9 +87,9 @@
> * @ctl_offs: The offset for main power control register.
> * @sram_pdn_bits: The mask for sram power control bits.
> * @sram_pdn_ack_bits: The mask for sram power control acked bits.
> - * @bus_prot_mask: The mask for single step bus protection.
> * @basic_clk_name: The basic clocks required by this power domain.
> * @caps: The flag for active wake-up action.
> + * @bp_table: The mask table for multiple step bus protection.
> */
> struct scp_domain_data {
> const char *name;
> @@ -97,9 +97,9 @@ struct scp_domain_data {
> int ctl_offs;
> u32 sram_pdn_bits;
> u32 sram_pdn_ack_bits;
> - u32 bus_prot_mask;
> const char *basic_clk_name[MAX_CLKS];
> u8 caps;
> + struct bus_prot bp_table[MAX_STEPS];
> };
>
> struct scp;
> @@ -123,8 +123,8 @@ struct scp {
> struct device *dev;
> void __iomem *base;
> struct regmap *infracfg;
> + struct regmap *smi_common;
> struct scp_ctrl_reg ctrl_reg;
> - bool bus_prot_reg_update;
> };
>
> struct scp_subdomain {
> @@ -138,7 +138,6 @@ struct scp_soc_data {
> const struct scp_subdomain *subdomains;
> int num_subdomains;
> const struct scp_ctrl_reg regs;
> - bool bus_prot_reg_update;
> };
>
> static int scpsys_domain_is_on(struct scp_domain *scpd)
> @@ -252,24 +251,16 @@ static int scpsys_bus_protect_enable(struct scp_domain *scpd)
> {
> struct scp *scp = scpd->scp;
>
> - if (!scpd->data->bus_prot_mask)
> - return 0;
> -
> - return mtk_infracfg_set_bus_protection(scp->infracfg,
> - scpd->data->bus_prot_mask,
> - scp->bus_prot_reg_update);
> + return mtk_scpsys_ext_set_bus_protection(scpd->data->bp_table,
> + scp->infracfg, scp->smi_common);

Now that's just a wrapper which does add nothing but another indirection. We can
call mtk_scpsys_ext_set_bus_protection() directly (also I don't like the name,
actually why don't mtk_scpsys_set_bus_protection()?)

> }
>
> static int scpsys_bus_protect_disable(struct scp_domain *scpd)
> {
> struct scp *scp = scpd->scp;
>
> - if (!scpd->data->bus_prot_mask)
> - return 0;
> -
> - return mtk_infracfg_clear_bus_protection(scp->infracfg,
> - scpd->data->bus_prot_mask,
> - scp->bus_prot_reg_update);
> + return mtk_scpsys_ext_clear_bus_protection(scpd->data->bp_table,
> + scp->infracfg, scp->smi_common);
> }
>
> static int scpsys_power_on(struct generic_pm_domain *genpd)
> @@ -404,8 +395,7 @@ static int init_basic_clks(struct platform_device *pdev, struct clk **clk,
>
> static struct scp *init_scp(struct platform_device *pdev,
> const struct scp_domain_data *scp_domain_data, int num,
> - const struct scp_ctrl_reg *scp_ctrl_reg,
> - bool bus_prot_reg_update)
> + const struct scp_ctrl_reg *scp_ctrl_reg)
> {
> struct genpd_onecell_data *pd_data;
> struct resource *res;
> @@ -419,8 +409,6 @@ static struct scp *init_scp(struct platform_device *pdev,
> scp->ctrl_reg.pwr_sta_offs = scp_ctrl_reg->pwr_sta_offs;
> scp->ctrl_reg.pwr_sta2nd_offs = scp_ctrl_reg->pwr_sta2nd_offs;
>
> - scp->bus_prot_reg_update = bus_prot_reg_update;
> -
> scp->dev = &pdev->dev;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -448,6 +436,17 @@ static struct scp *init_scp(struct platform_device *pdev,
> return ERR_CAST(scp->infracfg);
> }
>
> + scp->smi_common = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> + "smi_comm");
> +
> + if (scp->smi_common == ERR_PTR(-ENODEV)) {
> + scp->smi_common = NULL;
> + } else if (IS_ERR(scp->smi_common)) {
> + dev_err(&pdev->dev, "Cannot find smi_common controller: %ld\n",
> + PTR_ERR(scp->smi_common));
> + return ERR_CAST(scp->smi_common);
> + }
> +
> for (i = 0; i < num; i++) {
> struct scp_domain *scpd = &scp->domains[i];
> const struct scp_domain_data *data = &scp_domain_data[i];
> @@ -530,8 +529,11 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .name = "conn",
> .sta_mask = PWR_STATUS_CONN,
> .ctl_offs = SPM_CONN_PWR_CON,
> - .bus_prot_mask = MT2701_TOP_AXI_PROT_EN_CONN_M |
> - MT2701_TOP_AXI_PROT_EN_CONN_S,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT2701_TOP_AXI_PROT_EN_CONN_M |
> + MT2701_TOP_AXI_PROT_EN_CONN_S),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT2701_POWER_DOMAIN_DISP] = {
> @@ -540,7 +542,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .ctl_offs = SPM_DIS_PWR_CON,
> .sram_pdn_bits = GENMASK(11, 8),
> .basic_clk_name = {"mm"},
> - .bus_prot_mask = MT2701_TOP_AXI_PROT_EN_MM_M0,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT2701_TOP_AXI_PROT_EN_MM_M0),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT2701_POWER_DOMAIN_MFG] = {
> @@ -675,7 +680,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .sram_pdn_bits = GENMASK(8, 8),
> .sram_pdn_ack_bits = GENMASK(16, 16),
> .basic_clk_name = {"mfg"},
> - .bus_prot_mask = BIT(14) | BIT(21) | BIT(23),
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0x260, 0x264, 0x220, 0x228,
> + BIT(14) | BIT(21) | BIT(23)),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT2712_POWER_DOMAIN_MFG_SC1] = {
> @@ -747,7 +755,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .sram_pdn_bits = GENMASK(8, 8),
> .sram_pdn_ack_bits = GENMASK(12, 12),
> .basic_clk_name = {"mm"},
> - .bus_prot_mask = (BIT(1) | BIT(2)),
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + BIT(1) | BIT(2)),
> + },
> },
> [MT6797_POWER_DOMAIN_AUDIO] = {
> .name = "audio",
> @@ -794,7 +805,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .ctl_offs = SPM_ETHSYS_PWR_CON,
> .sram_pdn_bits = GENMASK(11, 8),
> .sram_pdn_ack_bits = GENMASK(15, 12),
> - .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_ETHSYS,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT7622_TOP_AXI_PROT_EN_ETHSYS),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT7622_POWER_DOMAIN_HIF0] = {
> @@ -804,7 +818,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .sram_pdn_bits = GENMASK(11, 8),
> .sram_pdn_ack_bits = GENMASK(15, 12),
> .basic_clk_name = {"hif_sel"},
> - .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_HIF0,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT7622_TOP_AXI_PROT_EN_HIF0),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT7622_POWER_DOMAIN_HIF1] = {
> @@ -814,7 +831,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .sram_pdn_bits = GENMASK(11, 8),
> .sram_pdn_ack_bits = GENMASK(15, 12),
> .basic_clk_name = {"hif_sel"},
> - .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_HIF1,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT7622_TOP_AXI_PROT_EN_HIF1),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT7622_POWER_DOMAIN_WB] = {
> @@ -823,7 +843,10 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .ctl_offs = SPM_WB_PWR_CON,
> .sram_pdn_bits = 0,
> .sram_pdn_ack_bits = 0,
> - .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_WB,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT7622_TOP_AXI_PROT_EN_WB),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP | MTK_SCPD_FWAIT_SRAM,
> },
> };
> @@ -837,8 +860,11 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .name = "conn",
> .sta_mask = PWR_STATUS_CONN,
> .ctl_offs = SPM_CONN_PWR_CON,
> - .bus_prot_mask = MT2701_TOP_AXI_PROT_EN_CONN_M |
> - MT2701_TOP_AXI_PROT_EN_CONN_S,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT2701_TOP_AXI_PROT_EN_CONN_M |
> + MT2701_TOP_AXI_PROT_EN_CONN_S),
> + },
> .caps = MTK_SCPD_ACTIVE_WAKEUP,
> },
> [MT7623A_POWER_DOMAIN_ETH] = {
> @@ -903,8 +929,11 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .sram_pdn_bits = GENMASK(11, 8),
> .sram_pdn_ack_bits = GENMASK(12, 12),
> .basic_clk_name = {"mm"},
> - .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
> - MT8173_TOP_AXI_PROT_EN_MM_M1,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT8173_TOP_AXI_PROT_EN_MM_M0 |
> + MT8173_TOP_AXI_PROT_EN_MM_M1),
> + },
> },
> [MT8173_POWER_DOMAIN_VENC_LT] = {
> .name = "venc_lt",
> @@ -950,10 +979,13 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .ctl_offs = SPM_MFG_PWR_CON,
> .sram_pdn_bits = GENMASK(13, 8),
> .sram_pdn_ack_bits = GENMASK(21, 16),
> - .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S |
> - MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> - MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> - MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
> + .bp_table = {
> + BUS_PROT(IFR_TYPE, 0, 0, 0x220, 0x228,
> + MT8173_TOP_AXI_PROT_EN_MFG_S |
> + MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> + MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> + MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT),
> + },
> },
> };
>
> @@ -969,7 +1001,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND
> },
> - .bus_prot_reg_update = true,
> };
>
> static const struct scp_soc_data mt2712_data = {
> @@ -981,7 +1012,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND
> },
> - .bus_prot_reg_update = false,
> };
>
> static const struct scp_soc_data mt6797_data = {
> @@ -993,7 +1023,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS_MT6797,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND_MT6797
> },
> - .bus_prot_reg_update = true,
> };
>
> static const struct scp_soc_data mt7622_data = {
> @@ -1003,7 +1032,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND
> },
> - .bus_prot_reg_update = true,
> };
>
> static const struct scp_soc_data mt7623a_data = {
> @@ -1013,7 +1041,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND
> },
> - .bus_prot_reg_update = true,
> };
>
> static const struct scp_soc_data mt8173_data = {
> @@ -1025,7 +1052,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
> .pwr_sta_offs = SPM_PWR_STATUS,
> .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND
> },
> - .bus_prot_reg_update = true,
> };
>
> /*
> @@ -1066,8 +1092,7 @@ static int scpsys_probe(struct platform_device *pdev)
>
> soc = of_device_get_match_data(&pdev->dev);
>
> - scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs,
> - soc->bus_prot_reg_update);
> + scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs);
> if (IS_ERR(scp))
> return PTR_ERR(scp);
>
> diff --git a/drivers/soc/mediatek/scpsys-ext.h b/drivers/soc/mediatek/scpsys-ext.h
> new file mode 100644
> index 0000000..458b2c5
> --- /dev/null
> +++ b/drivers/soc/mediatek/scpsys-ext.h
> @@ -0,0 +1,67 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __SOC_MEDIATEK_SCPSYS_EXT_H
> +#define __SOC_MEDIATEK_SCPSYS_EXT_H
> +
> +#define MAX_STEPS 4
> +
> +#define _BUS_PROT(_type, _set_ofs, _clr_ofs, \
> + _en_ofs, _sta_ofs, _mask, _ignore_clr_ack) { \
> + .type = _type, \
> + .set_ofs = _set_ofs, \
> + .clr_ofs = _clr_ofs, \
> + .en_ofs = _en_ofs, \
> + .sta_ofs = _sta_ofs, \
> + .mask = _mask, \
> + .ignore_clr_ack = _ignore_clr_ack, \
> + }
> +
> +#define BUS_PROT(_type, _set_ofs, _clr_ofs, \
> + _en_ofs, _sta_ofs, _mask) \
> + _BUS_PROT(_type, _set_ofs, _clr_ofs, \
> + _en_ofs, _sta_ofs, _mask, false)
> +
> +#define BUS_PROT_IGN(_type, _set_ofs, _clr_ofs, \
> + _en_ofs, _sta_ofs, _mask) \
> + _BUS_PROT(_type, _set_ofs, _clr_ofs, \
> + _en_ofs, _sta_ofs, _mask, true)
> +
> +#define MT2701_TOP_AXI_PROT_EN_MM_M0 BIT(1)
> +#define MT2701_TOP_AXI_PROT_EN_CONN_M BIT(2)
> +#define MT2701_TOP_AXI_PROT_EN_CONN_S BIT(8)
> +
> +#define MT7622_TOP_AXI_PROT_EN_ETHSYS (BIT(3) | BIT(17))
> +#define MT7622_TOP_AXI_PROT_EN_HIF0 (BIT(24) | BIT(25))
> +#define MT7622_TOP_AXI_PROT_EN_HIF1 (BIT(26) | BIT(27) | \
> + BIT(28))
> +#define MT7622_TOP_AXI_PROT_EN_WB (BIT(2) | BIT(6) | \
> + BIT(7) | BIT(8))
> +
> +#define MT8173_TOP_AXI_PROT_EN_MM_M0 BIT(1)
> +#define MT8173_TOP_AXI_PROT_EN_MM_M1 BIT(2)
> +#define MT8173_TOP_AXI_PROT_EN_MFG_S BIT(14)
> +#define MT8173_TOP_AXI_PROT_EN_MFG_M0 BIT(21)
> +#define MT8173_TOP_AXI_PROT_EN_MFG_M1 BIT(22)
> +#define MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT BIT(23)
> +
> +enum regmap_type {
> + INVALID_TYPE = 0,
> + IFR_TYPE,
> + SMI_TYPE,
> +};
> +
> +struct bus_prot {
> + enum regmap_type type;
> + u32 set_ofs;
> + u32 clr_ofs;

Please try to keep variable names consistent. You change for example set_ofs to
reg_set. That makes the code more difficult to read and understand.

> + u32 en_ofs;
> + u32 sta_ofs;
> + u32 mask;
> + bool ignore_clr_ack;
> +};
> +
> +int mtk_scpsys_ext_set_bus_protection(const struct bus_prot *bp_table,
> + struct regmap *infracfg, struct regmap *smi_common);
> +int mtk_scpsys_ext_clear_bus_protection(const struct bus_prot *bp_table,
> + struct regmap *infracfg, struct regmap *smi_common);
> +
> +#endif /* __SOC_MEDIATEK_SCPSYS_EXT_H */
>

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