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From:   Weiyi Lu <weiyi.lu@mediatek.com>
To:     Matthias Brugger <matthias.bgg@gmail.com>,
        Stephen Boyd <sboyd@codeaurora.org>,
        Rob Herring <robh@kernel.org>
CC:     James Liao <jamesjj.liao@mediatek.com>,
        Fan Chen <fan.chen@mediatek.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-mediatek@lists.infradead.org>, <linux-clk@vger.kernel.org>,
        <srv_heupstream@mediatek.com>, Weiyi Lu <weiyi.lu@mediatek.com>,
        Owen Chen <owen.chen@mediatek.com>,
        Mars Cheng <mars.cheng@mediatek.com>
Subject: [PATCH v1 04/11] soc: mediatek: add new flow for mtcmos power.
Date:   Tue, 6 Nov 2018 14:41:59 +0800
Message-ID: <20181106064206.17535-6-weiyi.lu@mediatek.com>
In-Reply-To: <20181106064206.17535-1-weiyi.lu@mediatek.com>
References: <20181106064206.17535-1-weiyi.lu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Owen Chen <owen.chen@mediatek.com>

Both MT8183 & MT6765 add more bus protect node than previous project,
therefore we add two more register for setup bus protect, which reside
at INFRA_CFG & SMI_COMMON.

With the following change
1. bus protect need not only infracfg but smi_common registers involved
   to setup. Therefore we add a set/clr APIs with more customize arguments.

The second change is that we also add subsys CG control flow before/after
the bus protect/sram control, due to bus protect need SMI bus relative CGs
enable to feed-back its ack, and some master's sram control need CG enable
to on/off its resource sequentially.

With the following change
1. turn on subsys CG before sram pwron and release bus protect.
2. turn off subsys CG after the process of set bus protect/receive
   ack/disable sram.

The last change is for some power domains like vpu_core on MT8183 whose
sram need to do clock and internal isolation while power on/off sram.
We add a flag "sram_iso_ctrl" in scp_domain_data to judge if we need to
do the extra sram isolation control or not.

Signed-off-by: Owen Chen <owen.chen@mediatek.com>
Signed-off-by: Mars Cheng <mars.cheng@mediatek.com>
Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
---
 drivers/soc/mediatek/Makefile           |   2 +-
 drivers/soc/mediatek/mtk-scpsys-ext.c   | 102 +++++++
 drivers/soc/mediatek/mtk-scpsys.c       | 379 +++++++++++++++++++-----
 include/linux/soc/mediatek/scpsys-ext.h |  39 +++
 4 files changed, 451 insertions(+), 71 deletions(-)
 create mode 100644 drivers/soc/mediatek/mtk-scpsys-ext.c
 create mode 100644 include/linux/soc/mediatek/scpsys-ext.h

diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 12998b08819e..9dc6670c19cb 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,3 +1,3 @@
-obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
+obj-$(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-scpsys-ext.c b/drivers/soc/mediatek/mtk-scpsys-ext.c
new file mode 100644
index 000000000000..fa5623b47d6b
--- /dev/null
+++ b/drivers/soc/mediatek/mtk-scpsys-ext.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Owen Chen <Owen.Chen@mediatek.com>
+ */
+#include <linux/ktime.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/soc/mediatek/scpsys-ext.h>
+
+#define MTK_POLL_DELAY_US   10
+#define MTK_POLL_TIMEOUT    (jiffies_to_usecs(HZ))
+
+static int set_bus_protection(struct regmap *map, u32 mask, u32 ack_mask,
+		u32 reg_set, u32 reg_sta, u32 reg_en)
+{
+	u32 val;
+	int ret;
+
+	if (reg_set)
+		regmap_write(map, reg_set, mask);
+	else
+		regmap_update_bits(map, reg_en, mask, mask);
+
+	ret = regmap_read_poll_timeout(map, reg_sta,
+			val, (val & ack_mask) == ack_mask,
+			MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+
+	return ret;
+}
+
+static int clear_bus_protection(struct regmap *map, u32 mask, u32 ack_mask,
+		u32 reg_clr, u32 reg_sta, u32 reg_en)
+{
+	u32 val;
+	int ret;
+
+	if (reg_clr)
+		regmap_write(map, reg_clr, mask);
+	else
+		regmap_update_bits(map, reg_en, mask, 0);
+
+	ret = regmap_read_poll_timeout(map, reg_sta,
+			val, !(val & ack_mask),
+			MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+
+	return ret;
+}
+
+int mtk_scpsys_ext_set_bus_protection(const struct bus_prot *bp_table,
+	struct regmap *infracfg, struct regmap *smi_common)
+{
+	int i, ret;
+	struct regmap *map;
+
+	for (i = 0; i < MAX_STEPS && bp_table[i].mask; i++) {
+		map = (bp_table[i].type == IFR_TYPE) ? infracfg :
+			(bp_table[i].type == SMI_TYPE) ? smi_common :
+			NULL;
+		if (!map)
+			return -EINVAL;
+
+		ret = set_bus_protection(map,
+				bp_table[i].mask, bp_table[i].mask,
+				bp_table[i].set_ofs, bp_table[i].sta_ofs,
+				bp_table[i].en_ofs);
+
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+int mtk_scpsys_ext_clear_bus_protection(const struct bus_prot *bp_table,
+	struct regmap *infracfg, struct regmap *smi_common)
+{
+	int i, ret = 0;
+	struct regmap *map;
+
+	for (i = MAX_STEPS - 1; i >= 0; i--) {
+		if (!bp_table[i].mask)
+			continue;
+
+		map = (bp_table[i].type == IFR_TYPE) ? infracfg :
+			(bp_table[i].type == SMI_TYPE) ? smi_common :
+			NULL;
+		if (!map)
+			return -EINVAL;
+
+		ret = clear_bus_protection(map,
+				bp_table[i].mask, bp_table[i].clr_ack_mask,
+				bp_table[i].clr_ofs, bp_table[i].sta_ofs,
+				bp_table[i].en_ofs);
+
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 5b24bb4bfbf6..80be2e05e4e0 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
  *
@@ -20,6 +21,7 @@
 #include <linux/pm_domain.h>
 #include <linux/regulator/consumer.h>
 #include <linux/soc/mediatek/infracfg.h>
+#include <linux/soc/mediatek/scpsys-ext.h>
 
 #include <dt-bindings/power/mt2701-power.h>
 #include <dt-bindings/power/mt2712-power.h>
@@ -64,6 +66,8 @@
 #define PWR_ON_BIT			BIT(2)
 #define PWR_ON_2ND_BIT			BIT(3)
 #define PWR_CLK_DIS_BIT			BIT(4)
+#define PWR_SRAM_CLKISO_BIT		BIT(5)
+#define PWR_SRAM_ISOINT_B_BIT		BIT(6)
 
 #define PWR_STATUS_CONN			BIT(1)
 #define PWR_STATUS_DISP			BIT(3)
@@ -115,16 +119,38 @@ static const char * const clk_names[] = {
 };
 
 #define MAX_CLKS	3
-
+#define MAX_SUBSYS_CLKS 10
+
+/**
+ * struct scp_domain_data - scp domain data for power on/off flow
+ * @name: The domain name.
+ * @sta_mask: The mask for power on/off status bit.
+ * @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.
+ * @clk_id: The basic clock needs to be enabled before enabling certain
+ *          power domains.
+ * @basic_clk_name: provide the same purpose with field "clk_id"
+ *                  by declaring basic clock prefix name rathan than clk_id.
+ * @subsys_clk_prefix: The prefix name of the clocks need to be enabled
+ *                     before releasing bus protection.
+ * @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;
 	u32 sta_mask;
 	int ctl_offs;
+	bool sram_iso_ctrl;
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
 	enum clk_id clk_id[MAX_CLKS];
+	const char *basic_clk_name[MAX_CLKS];
+	const char *subsys_clk_prefix;
 	u8 caps;
+	struct bus_prot bp_table[MAX_STEPS];
 };
 
 struct scp;
@@ -133,6 +159,7 @@ struct scp_domain {
 	struct generic_pm_domain genpd;
 	struct scp *scp;
 	struct clk *clk[MAX_CLKS];
+	struct clk *subsys_clk[MAX_SUBSYS_CLKS];
 	const struct scp_domain_data *data;
 	struct regulator *supply;
 };
@@ -148,6 +175,7 @@ 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;
 };
@@ -188,20 +216,26 @@ static int scpsys_domain_is_on(struct scp_domain *scpd)
 	return -EINVAL;
 }
 
-static int scpsys_power_on(struct generic_pm_domain *genpd)
+static int scpsys_regulator_onoff(struct scp_domain *scpd, bool on)
 {
-	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
-	struct scp *scp = scpd->scp;
-	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
-	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
-	u32 val;
-	int ret, tmp;
+	struct regulator *s = scpd->supply;
+
+	if (!s)
+		return 0;
+
+	return on ? regulator_enable(s) : regulator_disable(s);
+}
+
+static int scpsys_basic_clk_onoff(struct scp_domain *scpd, bool on)
+{
+	int ret = 0;
 	int i;
 
-	if (scpd->supply) {
-		ret = regulator_enable(scpd->supply);
-		if (ret)
-			return ret;
+	if (!on) {
+		for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
+			clk_disable_unprepare(scpd->clk[i]);
+
+		return ret;
 	}
 
 	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) {
@@ -210,10 +244,147 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 			for (--i; i >= 0; i--)
 				clk_disable_unprepare(scpd->clk[i]);
 
-			goto err_clk;
+			break;
 		}
 	}
 
+	return ret;
+}
+
+static int scpsys_sram_onoff(struct scp_domain *scpd, void __iomem *ctl_addr,
+		bool on)
+{
+	u32 val, ack;
+	int tmp;
+	int ret = 0;
+	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
+
+	if (!on && scpd->data->sram_iso_ctrl)	{
+		val = readl(ctl_addr);
+		val |= PWR_SRAM_CLKISO_BIT;
+		writel(val, ctl_addr);
+		val &= ~PWR_SRAM_ISOINT_B_BIT;
+		writel(val, ctl_addr);
+		udelay(1);
+	}
+
+	val = readl(ctl_addr);
+	if (on) {
+		val &= ~scpd->data->sram_pdn_bits;
+		ack = 0;
+	} else {
+		val |= scpd->data->sram_pdn_bits;
+		ack = pdn_ack;
+	}
+	writel(val, ctl_addr);
+
+	/* Either wait until SRAM_PDN_ACK all 0 or have a force wait */
+	if (on && MTK_SCPD_CAPS(scpd, MTK_SCPD_FWAIT_SRAM)) {
+		/*
+		 * Currently, MTK_SCPD_FWAIT_SRAM is necessary only for
+		 * MT7622_POWER_DOMAIN_WB and thus just a trivial setup
+		 * is applied here.
+		 */
+		usleep_range(12000, 12100);
+	} else
+		/* Either wait until SRAM_PDN_ACK all 1 or 0 */
+		ret = readl_poll_timeout(ctl_addr, tmp,
+				(tmp & pdn_ack) == ack,
+				MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+
+	if (on && scpd->data->sram_iso_ctrl)	{
+		val = readl(ctl_addr);
+		val |= PWR_SRAM_ISOINT_B_BIT;
+		writel(val, ctl_addr);
+		udelay(1);
+		val &= ~PWR_SRAM_CLKISO_BIT;
+		writel(val, ctl_addr);
+	}
+
+	return ret;
+}
+
+static int scpsys_subsys_clk_onoff(struct scp_domain *scpd, bool on)
+{
+	int ret = 0;
+	int i;
+
+	if (!on) {
+		for (i = MAX_SUBSYS_CLKS - 1; i >= 0; i--) {
+			struct clk *clk = scpd->subsys_clk[i];
+
+			if (clk)
+				clk_disable_unprepare(clk);
+		}
+
+		return ret;
+	}
+
+	for (i = 0; i < MAX_SUBSYS_CLKS && scpd->subsys_clk[i]; i++) {
+		struct clk *clk = scpd->subsys_clk[i];
+
+		ret = clk_prepare_enable(clk);
+		if (ret) {
+			for (--i; i >= 0; i--) {
+				struct clk *clk = scpd->subsys_clk[i];
+
+				clk_disable_unprepare(clk);
+			}
+
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int scpsys_bus_protect_onoff(struct scp_domain *scpd, bool on)
+{
+	struct scp *scp = scpd->scp;
+	int ret = 0;
+
+	if (scpd->data->bus_prot_mask) {
+		if (on)
+			ret = mtk_infracfg_set_bus_protection(scp->infracfg,
+					scpd->data->bus_prot_mask,
+					scp->bus_prot_reg_update);
+		else
+			ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
+					scpd->data->bus_prot_mask,
+					scp->bus_prot_reg_update);
+	} else if (scpd->data->bp_table[0].mask) {
+		if (on)
+			ret = mtk_scpsys_ext_set_bus_protection(
+					scpd->data->bp_table,
+					scp->infracfg,
+					scp->smi_common);
+		else
+			ret = mtk_scpsys_ext_clear_bus_protection(
+					scpd->data->bp_table,
+					scp->infracfg,
+					scp->smi_common);
+	}
+
+	return ret;
+}
+
+static int scpsys_power_on(struct generic_pm_domain *genpd)
+{
+	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
+	struct scp *scp = scpd->scp;
+	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
+	u32 val;
+	int ret, tmp;
+
+	ret = scpsys_regulator_onoff(scpd, true);
+	if (ret < 0)
+		return ret;
+
+	ret = scpsys_basic_clk_onoff(scpd, true);
+	if (ret)
+		goto err_clk;
+
+	/* subsys power on */
 	val = readl(ctl_addr);
 	val |= PWR_ON_BIT;
 	writel(val, ctl_addr);
@@ -226,6 +397,7 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 	if (ret < 0)
 		goto err_pwr_ack;
 
+
 	val &= ~PWR_CLK_DIS_BIT;
 	writel(val, ctl_addr);
 
@@ -235,43 +407,26 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 	val |= PWR_RST_B_BIT;
 	writel(val, ctl_addr);
 
-	val &= ~scpd->data->sram_pdn_bits;
-	writel(val, ctl_addr);
-
-	/* Either wait until SRAM_PDN_ACK all 0 or have a force wait */
-	if (MTK_SCPD_CAPS(scpd, MTK_SCPD_FWAIT_SRAM)) {
-		/*
-		 * Currently, MTK_SCPD_FWAIT_SRAM is necessary only for
-		 * MT7622_POWER_DOMAIN_WB and thus just a trivial setup is
-		 * applied here.
-		 */
-		usleep_range(12000, 12100);
+	ret = scpsys_subsys_clk_onoff(scpd, true);
+	if (ret < 0)
+		goto err_pwr_ack;
 
-	} else {
-		ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0,
-					 MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
-		if (ret < 0)
-			goto err_pwr_ack;
-	}
+	ret = scpsys_sram_onoff(scpd, ctl_addr, true);
+	if (ret < 0)
+		goto err_sram;
 
-	if (scpd->data->bus_prot_mask) {
-		ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
-				scpd->data->bus_prot_mask,
-				scp->bus_prot_reg_update);
-		if (ret)
-			goto err_pwr_ack;
-	}
+	ret = scpsys_bus_protect_onoff(scpd, false);
+	if (ret < 0)
+		goto err_sram;
 
 	return 0;
 
+err_sram:
+	scpsys_subsys_clk_onoff(scpd, false);
 err_pwr_ack:
-	for (i = MAX_CLKS - 1; i >= 0; i--) {
-		if (scpd->clk[i])
-			clk_disable_unprepare(scpd->clk[i]);
-	}
+	scpsys_basic_clk_onoff(scpd, false);
 err_clk:
-	if (scpd->supply)
-		regulator_disable(scpd->supply);
+	scpsys_regulator_onoff(scpd, false);
 
 	dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name);
 
@@ -283,29 +438,21 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
 	struct scp *scp = scpd->scp;
 	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
-	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
 	u32 val;
 	int ret, tmp;
-	int i;
 
-	if (scpd->data->bus_prot_mask) {
-		ret = mtk_infracfg_set_bus_protection(scp->infracfg,
-				scpd->data->bus_prot_mask,
-				scp->bus_prot_reg_update);
-		if (ret)
-			goto out;
-	}
-
-	val = readl(ctl_addr);
-	val |= scpd->data->sram_pdn_bits;
-	writel(val, ctl_addr);
+	ret = scpsys_bus_protect_onoff(scpd, true);
+	if (ret < 0)
+		goto out;
 
-	/* wait until SRAM_PDN_ACK all 1 */
-	ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack,
-				 MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+	ret = scpsys_sram_onoff(scpd, ctl_addr, false);
 	if (ret < 0)
 		goto out;
 
+	ret = scpsys_subsys_clk_onoff(scpd, false);
+
+	/* subsys power off */
+	val = readl(ctl_addr);
 	val |= PWR_ISO_BIT;
 	writel(val, ctl_addr);
 
@@ -327,11 +474,9 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	if (ret < 0)
 		goto out;
 
-	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
-		clk_disable_unprepare(scpd->clk[i]);
+	scpsys_basic_clk_onoff(scpd, false);
 
-	if (scpd->supply)
-		regulator_disable(scpd->supply);
+	scpsys_regulator_onoff(scpd, false);
 
 	return 0;
 
@@ -341,6 +486,69 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	return ret;
 }
 
+static int init_subsys_clks(struct platform_device *pdev,
+		const char *prefix, struct clk **clk)
+{
+	struct device_node *node = pdev->dev.of_node;
+	u32 sub_clk_cnt = 0;
+	u32 prefix_len = 0;
+	int str_sz = 0;
+	int clk_idx;
+	int ret = 0;
+
+	if (!node) {
+		dev_err(&pdev->dev, "Cannot find scpsys node: %ld\n",
+			PTR_ERR(node));
+		return PTR_ERR(node);
+	}
+
+	str_sz = of_property_count_strings(node, "clock-names");
+	if (str_sz < 0) {
+		dev_err(&pdev->dev, "Cannot get any subsys strings: %d\n",
+				str_sz);
+		return str_sz;
+	}
+
+	prefix_len = strlen(prefix);
+
+	for (clk_idx = 0; clk_idx < str_sz; clk_idx++) {
+		const char *clk_name;
+
+		ret = of_property_read_string_index(node, "clock-names",
+					clk_idx, &clk_name);
+		if (ret < 0) {
+			dev_err(&pdev->dev,
+					"Cannot read subsys string[%d]: %d\n",
+					clk_idx, ret);
+			return ret;
+		}
+
+		if (!strncmp(clk_name, prefix, prefix_len)
+				&& (strchr(clk_name + prefix_len, '-')
+				!= NULL)) {
+			if (sub_clk_cnt >= MAX_SUBSYS_CLKS) {
+				dev_err(&pdev->dev,
+					"subsys clk out of range %d\n",
+					sub_clk_cnt);
+				return -ENOMEM;
+			}
+
+			clk[sub_clk_cnt] = devm_clk_get(
+					&pdev->dev, clk_name);
+
+			if (IS_ERR(clk)) {
+				dev_err(&pdev->dev,
+					"Subsys clk read fail %ld\n",
+					PTR_ERR(clk));
+				return PTR_ERR(clk);
+			}
+			sub_clk_cnt++;
+		}
+	}
+
+	return sub_clk_cnt;
+}
+
 static void init_clks(struct platform_device *pdev, struct clk **clk)
 {
 	int i;
@@ -396,6 +604,17 @@ 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];
@@ -417,22 +636,42 @@ static struct scp *init_scp(struct platform_device *pdev,
 		struct scp_domain *scpd = &scp->domains[i];
 		struct generic_pm_domain *genpd = &scpd->genpd;
 		const struct scp_domain_data *data = &scp_domain_data[i];
+		int clk_cnt = 0;
 
 		pd_data->domains[i] = genpd;
 		scpd->scp = scp;
 
 		scpd->data = data;
 
-		for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
-			struct clk *c = clk[data->clk_id[j]];
+		if (data->clk_id[0])
+			for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
+				struct clk *c = clk[data->clk_id[j]];
+
+				if (IS_ERR(c)) {
+					dev_err(&pdev->dev,
+						"%s: clk unavailable\n",
+						data->name);
+					return ERR_CAST(c);
+				}
 
-			if (IS_ERR(c)) {
-				dev_err(&pdev->dev, "%s: clk unavailable\n",
+				scpd->clk[j] = c;
+			}
+		else if (data->basic_clk_name[0])
+			for (j = 0; j < MAX_CLKS
+					&& data->basic_clk_name[j]; j++)
+				scpd->clk[j] = devm_clk_get(&pdev->dev,
+						data->basic_clk_name[j]);
+
+		if (data->subsys_clk_prefix) {
+			clk_cnt = init_subsys_clks(pdev,
+					data->subsys_clk_prefix,
+					scpd->subsys_clk);
+			if (clk_cnt < 0) {
+				dev_err(&pdev->dev,
+					"%s: subsys clk unavailable\n",
 					data->name);
-				return ERR_CAST(c);
+				return ERR_PTR(clk_cnt);
 			}
-
-			scpd->clk[j] = c;
 		}
 
 		genpd->name = data->name;
diff --git a/include/linux/soc/mediatek/scpsys-ext.h b/include/linux/soc/mediatek/scpsys-ext.h
new file mode 100644
index 000000000000..d0ed295c88a7
--- /dev/null
+++ b/include/linux/soc/mediatek/scpsys-ext.h
@@ -0,0 +1,39 @@
+/* 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, _clr_ack_mask) {	\
+		.type = _type,					\
+		.set_ofs = _set_ofs,				\
+		.clr_ofs = _clr_ofs,				\
+		.en_ofs = _en_ofs,				\
+		.sta_ofs = _sta_ofs,				\
+		.mask = _mask,					\
+		.clr_ack_mask = _clr_ack_mask,			\
+	}
+
+enum regmap_type {
+	IFR_TYPE,
+	SMI_TYPE,
+	MAX_REGMAP_TYPE,
+};
+
+struct bus_prot {
+	enum regmap_type type;
+	u32 set_ofs;
+	u32 clr_ofs;
+	u32 en_ofs;
+	u32 sta_ofs;
+	u32 mask;
+	u32 clr_ack_mask;
+};
+
+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 */
-- 
2.18.0