Add the apusys in soc.
Add driver for apu power domains.

Signed-off-by: Flora Fu <flora...@mediatek.com>
---
 drivers/soc/mediatek/Kconfig             |  10 +
 drivers/soc/mediatek/Makefile            |   1 +
 drivers/soc/mediatek/apusys/Makefile     |   2 +
 drivers/soc/mediatek/apusys/mtk-apu-pm.c | 613 +++++++++++++++++++++++
 4 files changed, 626 insertions(+)
 create mode 100644 drivers/soc/mediatek/apusys/Makefile
 create mode 100644 drivers/soc/mediatek/apusys/mtk-apu-pm.c

diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index fdd8bc08569e..76ee7e354b27 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -5,6 +5,16 @@
 menu "MediaTek SoC drivers"
        depends on ARCH_MEDIATEK || COMPILE_TEST
 
+config MTK_APUSYS
+       bool "MediaTek APUSYS Support"
+       select REGMAP
+       select PM_GENERIC_DOMAINS if PM
+       help
+         Say yes here to add support for the MediaTek AI Processing Unit
+         Subsystem(APUSYS).
+         The APUSYS is a proprietary hardware in SoC to support AI
+         operations.
+
 config MTK_CMDQ
        tristate "MediaTek CMDQ Support"
        depends on ARCH_MEDIATEK || COMPILE_TEST
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index c916b6799baa..4ca2d59b75cb 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_MTK_APUSYS) += apusys/
 obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
 obj-$(CONFIG_MTK_DEVAPC) += mtk-devapc.o
 obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
diff --git a/drivers/soc/mediatek/apusys/Makefile 
b/drivers/soc/mediatek/apusys/Makefile
new file mode 100644
index 000000000000..01c339e35b80
--- /dev/null
+++ b/drivers/soc/mediatek/apusys/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MTK_APUSYS) += mtk-apu-pm.o
diff --git a/drivers/soc/mediatek/apusys/mtk-apu-pm.c 
b/drivers/soc/mediatek/apusys/mtk-apu-pm.c
new file mode 100644
index 000000000000..37f481692cbb
--- /dev/null
+++ b/drivers/soc/mediatek/apusys/mtk-apu-pm.c
@@ -0,0 +1,613 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_clk.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <dt-bindings/power/mt8192-apu-power.h>
+
+#define APU_PD_IPUIF_HW_CG             BIT(0)
+#define APU_PD_RPC_AUTO_BUCK           BIT(1)
+#define APU_PD_CAPS(_pd, _x)           ((_pd)->data->caps & (_x))
+
+#define MTK_POLL_DELAY_US               10
+#define MTK_POLL_TIMEOUT                USEC_PER_SEC
+
+/*spm_cross_wake_m01*/
+#define WAKEUP_APU             (0x1 << 0)
+
+/* spm_other_pwr_status*/
+#define PWR_STATUS             (0x1 << 5)
+
+/* rpc_intf_pwr_rdy */
+#define PWR0_RDY               (0x1 << 0)
+
+/* rpc_top_con*/
+#define SLEEP_REQ              BIT(0)
+#define APU_BUCK_ELS_EN                BIT(3)
+
+/*conn_clr, conn1_clr, vcore_clr */
+#define CG_CLR (0xFFFFFFFF)
+
+/* mt8192 rpc_sw_type */
+#define MT8192_RPC_SW_TYPE0    (0x200)
+#define MT8192_RPC_SW_TYPE1    (0x210)
+#define MT8192_RPC_SW_TYPE2    (0x220)
+#define MT8192_RPC_SW_TYPE3    (0x230)
+#define MT8192_RPC_SW_TYPE4    (0x240)
+#define MT8192_RPC_SW_TYPE6    (0x260)
+#define MT8192_RPC_SW_TYPE7    (0x270)
+
+/* rpc_sw_type*/
+static const struct reg_sequence mt8192_rpc_sw_type[] = {
+       { MT8192_RPC_SW_TYPE0, 0xFF },
+       { MT8192_RPC_SW_TYPE2, 0x7 },
+       { MT8192_RPC_SW_TYPE3, 0x7 },
+       { MT8192_RPC_SW_TYPE6, 0x3 },
+};
+
+struct apu_top_domain {
+       u32 spm_ext_buck_iso;
+       u32 spm_ext_buck_iso_mask;
+       u32 spm_cross_wake_m01;
+       u32 spm_other_pwr;
+       u32 conn_clr;
+       u32 conn1_clr;
+       u32 vcore_clr;
+       u32 rpc_top_con;
+       u32 rpc_top_con_init_mask;
+       u32 rpc_top_sel;
+       u32 rpc_top_intf_pwr_rdy;
+       const struct reg_sequence *rpc_sw_type;
+       int rpc_sw_ntype;
+};
+
+static struct apu_top_domain mt8192_top_reg = {
+       .spm_ext_buck_iso = 0x39C,
+       .spm_ext_buck_iso_mask = 0x21,
+       .spm_cross_wake_m01 = 0x670,
+       .spm_other_pwr = 0x178,
+       .conn_clr = 0x008,
+       .vcore_clr = 0x008,
+       .rpc_top_con = 0x000,
+       .rpc_top_con_init_mask = 0x49E,
+       .rpc_top_sel = 0x004,
+       .rpc_top_intf_pwr_rdy = 0x044,
+       .rpc_sw_type = mt8192_rpc_sw_type,
+       .rpc_sw_ntype = ARRAY_SIZE(mt8192_rpc_sw_type),
+};
+
+struct apusys {
+       struct device *dev;
+       struct regmap *scpsys;
+       struct regmap *conn;
+       struct regmap *conn1;
+       struct regmap *vcore;
+       struct regmap *rpc;
+       struct regulator *vsram_supply;
+       const struct apu_pm_data *data;
+       struct genpd_onecell_data pd_data;
+       struct generic_pm_domain *domains[];
+};
+
+struct apu_domain {
+       struct generic_pm_domain genpd;
+       const struct apu_domain_data *data;
+       struct apusys *apusys;
+       struct regulator *domain_supply;
+       int num_clks;
+       struct clk_bulk_data *clks;
+       struct clk *clk_top_conn;
+       struct clk *clk_top_ipu_if;
+       struct clk *clk_off;
+       struct clk *clk_on_def;
+};
+
+struct apu_domain_data {
+       int domain_idx;
+       char *name;
+       struct apu_top_domain *topd;
+       u8 caps;
+};
+
+struct apu_pm_data {
+       const struct apu_domain_data *domains_data;
+       int num_domains;
+};
+
+#define to_apu_domain(gpd) container_of(gpd, struct apu_domain, genpd)
+
+static int apu_top_init_hw(struct apu_domain *pd)
+{
+       struct apusys *apusys = pd->apusys;
+       int ret;
+
+       /*
+        * set memory type to PD or sleep group
+        * sw_type register for each memory group, set to PD mode default
+        */
+       if (pd->data->topd->rpc_sw_ntype) {
+               ret = regmap_register_patch(apusys->rpc,
+                                           pd->data->topd->rpc_sw_type,
+                                           pd->data->topd->rpc_sw_ntype);
+               if (ret < 0) {
+                       dev_err(apusys->dev, "Failed to rpc patch: %d\n", ret);
+                       return ret;
+               }
+       }
+
+       /* mask RPC IRQ and bypass WFI */
+       regmap_set_bits(apusys->rpc, pd->data->topd->rpc_top_sel,
+                       pd->data->topd->rpc_top_con_init_mask);
+
+       if (APU_PD_CAPS(pd, APU_PD_RPC_AUTO_BUCK))
+               regmap_set_bits(apusys->rpc,
+                               pd->data->topd->rpc_top_con, APU_BUCK_ELS_EN);
+
+       return 0;
+}
+
+static const struct apu_domain_data apu_domain_data_mt8192[] = {
+       [MT8192_POWER_DOMAIN_APUSYS_TOP] = {
+               .domain_idx = 0,
+               .name = "apu-top",
+               .caps = APU_PD_IPUIF_HW_CG,
+               .topd = &mt8192_top_reg,
+       }
+};
+
+static const struct apu_pm_data mt8192_apu_pm_data = {
+       .domains_data = apu_domain_data_mt8192,
+       .num_domains = ARRAY_SIZE(apu_domain_data_mt8192),
+};
+
+static int apu_top_power_on(struct generic_pm_domain *genpd)
+{
+       struct apu_domain *pd = to_apu_domain(genpd);
+       struct apusys *apusys = pd->apusys;
+       int ret, tmp;
+
+       if (apusys->vsram_supply) {
+               ret = regulator_enable(apusys->vsram_supply);
+               if (ret < 0)
+                       return ret;
+       }
+
+       if (pd->domain_supply) {
+               ret = regulator_enable(pd->domain_supply);
+               if (ret < 0)
+                       goto err_regulator;
+       }
+
+       regmap_clear_bits(apusys->scpsys, pd->data->topd->spm_ext_buck_iso,
+                         pd->data->topd->spm_ext_buck_iso_mask);
+
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               ret = clk_prepare_enable(pd->clk_top_conn);
+               if (ret) {
+                       dev_err(apusys->dev, "Failed enable top_conn clk\n");
+                       goto err_clk;
+               }
+
+               ret = clk_set_parent(pd->clk_top_ipu_if, pd->clk_on_def);
+               if (ret) {
+                       dev_err(apusys->dev, "Failed set ipu_if mux\n");
+                       goto err_clk;
+               }
+
+               /* The ipu_if clock is gatting by HW. Only enable once. */
+               if (!__clk_is_enabled(pd->clk_top_ipu_if)) {
+                       ret = clk_prepare_enable(pd->clk_top_ipu_if);
+                       if (ret) {
+                               dev_err(apusys->dev, "Failed enable ipu_if\n");
+                               goto err_clk;
+                       }
+               }
+       } else {
+               ret = clk_bulk_prepare_enable(pd->num_clks, pd->clks);
+               if (ret)
+                       goto err_clk;
+       }
+
+       regmap_set_bits(apusys->scpsys,
+                       pd->data->topd->spm_cross_wake_m01, WAKEUP_APU);
+
+       ret = regmap_read_poll_timeout(apusys->scpsys,
+                                      pd->data->topd->spm_other_pwr,
+                                      tmp, (tmp & PWR_STATUS) == PWR_STATUS,
+                                      MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+       if (ret < 0) {
+               dev_err(apusys->dev, "apu top on wait SPM PWR_ACK != 0\n");
+               goto err_clk;
+       }
+
+       ret = regmap_read_poll_timeout(apusys->rpc,
+                                      pd->data->topd->rpc_top_intf_pwr_rdy,
+                                      tmp, (tmp & PWR0_RDY) == PWR0_RDY,
+                                      MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+       if (ret < 0) {
+               dev_err(apusys->dev, "apu top on wait RPC PWR_RDY != 0\n");
+               goto err_clk;
+       }
+
+       if (apusys->vcore)
+               regmap_write(apusys->vcore, pd->data->topd->vcore_clr, CG_CLR);
+
+       if (apusys->conn)
+               regmap_write(apusys->conn, pd->data->topd->conn_clr, CG_CLR);
+
+       if (apusys->conn1)
+               regmap_write(apusys->conn1, pd->data->topd->conn1_clr, CG_CLR);
+
+       return 0;
+
+err_clk:
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               clk_disable_unprepare(pd->clk_top_conn);
+               clk_disable_unprepare(pd->clk_top_ipu_if);
+       } else {
+               clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
+       }
+       if (pd->domain_supply)
+               ret = regulator_disable(pd->domain_supply);
+err_regulator:
+       if (apusys->vsram_supply)
+               ret = regulator_disable(apusys->vsram_supply);
+
+       return ret;
+}
+
+static int apu_top_power_off(struct generic_pm_domain *genpd)
+{
+       struct apu_domain *pd = to_apu_domain(genpd);
+       struct apusys *apusys = pd->apusys;
+       int ret, tmp;
+
+       if (apusys->vcore)
+               regmap_write(apusys->vcore, pd->data->topd->vcore_clr, CG_CLR);
+
+       if (apusys->conn)
+               regmap_write(apusys->conn, pd->data->topd->conn_clr, CG_CLR);
+
+       if (apusys->conn1)
+               regmap_write(apusys->conn1, pd->data->topd->conn1_clr, CG_CLR);
+
+       regmap_clear_bits(apusys->scpsys,
+                         pd->data->topd->spm_cross_wake_m01, WAKEUP_APU);
+
+       regmap_set_bits(apusys->rpc, pd->data->topd->rpc_top_con, SLEEP_REQ);
+
+       ret = regmap_read_poll_timeout(apusys->rpc,
+                                      pd->data->topd->rpc_top_intf_pwr_rdy,
+                                      tmp, (tmp & PWR0_RDY) == 0x0,
+                                      MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+       if (ret < 0) {
+               dev_err(apusys->dev, "apu top off wait RPC PWR_RDY != 0\n");
+               return ret;
+       }
+
+       ret = regmap_read_poll_timeout(apusys->scpsys,
+                                      pd->data->topd->spm_other_pwr, tmp,
+                                      (tmp & PWR_STATUS) == 0x0,
+                                      MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+       if (ret < 0) {
+               dev_err(apusys->dev, "apu top off wait SPM PWR_ACK != 0\n");
+               return ret;
+       }
+
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               clk_disable_unprepare(pd->clk_top_conn);
+               ret = clk_set_parent(pd->clk_top_ipu_if, pd->clk_off);
+               if (ret) {
+                       dev_err(apusys->dev, "Failed set ipu_if rate\n");
+                       return ret;
+               }
+       } else {
+               clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
+       }
+
+       regmap_set_bits(apusys->scpsys,
+                       pd->data->topd->spm_ext_buck_iso,
+                       pd->data->topd->spm_ext_buck_iso_mask);
+
+       if (apusys->vsram_supply) {
+               ret = regulator_disable(apusys->vsram_supply);
+               if (ret < 0)
+                       return ret;
+       }
+
+       if (pd->domain_supply) {
+               ret = regulator_disable(pd->domain_supply);
+               if (ret < 0)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static struct generic_pm_domain *apu_add_one_domain(struct apusys *apusys,
+                                                   struct device_node *node)
+{
+       const struct apu_domain_data *domain_data;
+       struct apu_domain *pd;
+       int ret;
+       u32 id;
+
+       ret = of_property_read_u32(node, "reg", &id);
+       if (ret) {
+               dev_dbg(apusys->dev, "%pOF: invalid reg: %d\n", node, ret);
+               return ERR_PTR(-EINVAL);
+       }
+
+       if (id >= apusys->data->num_domains) {
+               dev_dbg(apusys->dev, "%pOF: invalid id %d\n", node, id);
+               return ERR_PTR(-EINVAL);
+       }
+
+       domain_data = &apusys->data->domains_data[id];
+
+       pd = devm_kzalloc(apusys->dev, sizeof(*pd), GFP_KERNEL);
+       if (!pd)
+               return ERR_PTR(-ENOMEM);
+
+       pd->data   = domain_data;
+       pd->apusys = apusys;
+
+       pd->domain_supply = devm_regulator_get_optional(apusys->dev, "domain");
+       if (IS_ERR(pd->domain_supply))
+               pd->domain_supply = NULL;
+
+       /*
+        * For HW using ipu_if, the clock is switched to 26M
+        * when power down top domain and switch to default clock rate
+        * before power on.
+        */
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               pd->clk_top_conn = of_clk_get_by_name(node, "clk_top_conn");
+               if (IS_ERR(pd->clk_top_conn)) {
+                       dev_err(apusys->dev, "Fail to get clk_top_conn 
clock\n");
+                       ret = PTR_ERR(pd->clk_top_conn);
+                       goto err_put_clocks;
+               }
+
+               pd->clk_top_ipu_if = of_clk_get_by_name(node, "clk_top_ipu_if");
+               if (IS_ERR(pd->clk_top_ipu_if)) {
+                       dev_err(apusys->dev, "Fail to get clk_top_ipu_if 
clock\n");
+                       ret = PTR_ERR(pd->clk_top_ipu_if);
+                       goto err_put_clocks;
+               }
+
+               pd->clk_off = of_clk_get_by_name(node, "clk_off");
+               if (IS_ERR(pd->clk_off)) {
+                       dev_err(apusys->dev, "Fail to get clk_off clock\n");
+                       ret = PTR_ERR(pd->clk_off);
+                       goto err_put_clocks;
+               }
+
+               pd->clk_on_def = of_clk_get_by_name(node, "clk_on_default");
+               if (IS_ERR(pd->clk_on_def)) {
+                       dev_err(apusys->dev, "Fail to get clk_on_default 
clock\n");
+                       ret = PTR_ERR(pd->clk_on_def);
+                       goto err_put_clocks;
+               }
+       } else {
+               ret = devm_clk_bulk_get_all(apusys->dev, &pd->clks);
+               if (ret < 0) {
+                       dev_err(apusys->dev, "failed to get clocks %d\n", ret);
+                       return ERR_PTR(ret);
+               }
+               pd->num_clks = ret;
+       }
+
+       if (apusys->domains[id]) {
+               ret = -EINVAL;
+               dev_err(apusys->dev, "domain id %d already exists\n", id);
+               goto err_put_clocks;
+       }
+
+       /* set rpc hw init status */
+       ret = apu_top_init_hw(pd);
+       if (ret < 0) {
+               dev_dbg(apusys->dev, "top init fail ret = %d\n", ret);
+               goto err_put_clocks;
+       }
+
+       if (!pd->data->name)
+               pd->genpd.name = node->name;
+       else
+               pd->genpd.name = pd->data->name;
+       pd->genpd.power_off = apu_top_power_off;
+       pd->genpd.power_on = apu_top_power_on;
+
+       /*
+        * Initially turn on all domains to make the domains usable
+        * with !CONFIG_PM and to get the hardware in sync with the
+        * software.  The unused domains will be switched off during
+        * late_init time.
+        */
+       ret = pd->genpd.power_on(&pd->genpd);
+       if (ret < 0) {
+               dev_dbg(apusys->dev, "%pOF: power on domain fail: %d\n",
+                       node, ret);
+               goto err_put_clocks;
+       }
+
+       pm_genpd_init(&pd->genpd, NULL, false);
+
+       apusys->domains[id] = &pd->genpd;
+
+       return apusys->pd_data.domains[id];
+
+err_put_clocks:
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               clk_put(pd->clk_top_conn);
+               clk_put(pd->clk_top_ipu_if);
+               clk_put(pd->clk_off);
+               clk_put(pd->clk_on_def);
+       }
+       return ERR_PTR(ret);
+}
+
+static void apu_remove_one_domain(struct apu_domain *pd)
+{
+       int ret;
+
+       if (pd->genpd.power_off)
+               pd->genpd.power_off(&pd->genpd);
+
+       /*
+        * We're in the error cleanup already, so we only complain,
+        * but won't emit another error on top of the original one.
+        */
+       ret = pm_genpd_remove(&pd->genpd);
+       if (ret < 0)
+               dev_dbg(pd->apusys->dev,
+                       "Remove domain '%s' : %d - state may be inconsistent\n",
+                       pd->genpd.name, ret);
+
+       if (APU_PD_CAPS(pd, APU_PD_IPUIF_HW_CG)) {
+               clk_put(pd->clk_top_conn);
+               clk_put(pd->clk_top_ipu_if);
+               clk_put(pd->clk_off);
+               clk_put(pd->clk_on_def);
+       }
+}
+
+static void apu_domain_cleanup(struct apusys *apusys)
+{
+       struct generic_pm_domain *genpd;
+       struct apu_domain *pd;
+       int i;
+
+       for (i = apusys->pd_data.num_domains - 1; i >= 0; i--) {
+               genpd = apusys->pd_data.domains[i];
+               if (genpd) {
+                       pd = to_apu_domain(genpd);
+                       apu_remove_one_domain(pd);
+               }
+       }
+}
+
+static const struct of_device_id apu_pm_of_match[] = {
+       {
+               .compatible = "mediatek,mt8192-apu-pm",
+               .data = &mt8192_apu_pm_data,
+       },
+       { }
+};
+
+static int apu_pm_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct device_node *np = dev->of_node;
+       struct genpd_onecell_data *pd_data;
+       const struct apu_pm_data *data;
+       struct device_node *node;
+       struct apusys *apusys;
+       int ret;
+
+       data = of_device_get_match_data(&pdev->dev);
+       if (!data) {
+               dev_dbg(&pdev->dev, "no power domain data\n");
+               return -EINVAL;
+       }
+
+       apusys = devm_kzalloc(dev,
+                             struct_size(apusys, domains, data->num_domains),
+                             GFP_KERNEL);
+       if (!apusys)
+               return -ENOMEM;
+
+       apusys->dev = dev;
+       apusys->data = data;
+       apusys->pd_data.domains = apusys->domains;
+       apusys->pd_data.num_domains = data->num_domains;
+
+       apusys->vsram_supply = devm_regulator_get_optional(dev, "vsram");
+       if (IS_ERR(apusys->vsram_supply)) {
+               ret = PTR_ERR(apusys->vsram_supply);
+               if (ret != -EPROBE_DEFER) {
+                       dev_err(dev, "vsram_supply fail, ret=%d", ret);
+                       apusys->vsram_supply = NULL;
+               }
+               return ret;
+       }
+
+       /* rpc */
+       apusys->rpc = syscon_node_to_regmap(np);
+       if (IS_ERR(apusys->rpc)) {
+               dev_err(dev, "Unable to get rpc\n");
+               return PTR_ERR(apusys->rpc);
+       }
+
+       /* scpsys */
+       apusys->scpsys = syscon_regmap_lookup_by_phandle(np, "mediatek,scpsys");
+       if (IS_ERR(apusys->scpsys)) {
+               dev_err(dev, "Unable to get scpsys\n");
+               return PTR_ERR(apusys->scpsys);
+       }
+
+       /* apusys conn */
+       apusys->conn = syscon_regmap_lookup_by_phandle_optional(np, 
"mediatek,apu_conn");
+       if (IS_ERR(apusys->conn))
+               dev_info(dev, "No optional phandle apu_conn\n");
+
+       /* apusys conn1 */
+       apusys->conn1 = syscon_regmap_lookup_by_phandle_optional(np, 
"mediatek,apu_conn1");
+       if (IS_ERR(apusys->conn1))
+               dev_info(dev, "No optional phandle apu_conn1\n");
+
+       /* apusys vcore */
+       apusys->vcore = syscon_regmap_lookup_by_phandle_optional(np, 
"mediatek,apu_vcore");
+       if (IS_ERR(apusys->vcore))
+               dev_info(dev, "No optional phandle apu_vcore\n");
+
+       for_each_available_child_of_node(np, node) {
+               struct generic_pm_domain *domain;
+
+               domain = apu_add_one_domain(apusys, node);
+               if (IS_ERR(domain)) {
+                       ret = PTR_ERR(domain);
+                       of_node_put(node);
+                       goto err_cleanup_domains;
+               }
+       }
+
+       ret = of_genpd_add_provider_onecell(np, &apusys->pd_data);
+       if (ret) {
+               dev_dbg(dev, "failed to add provider: %d\n", ret);
+               goto err_cleanup_domains;
+       }
+
+       pd_data = &apusys->pd_data;
+
+       return 0;
+
+err_cleanup_domains:
+       apu_domain_cleanup(apusys);
+       return ret;
+}
+
+static struct platform_driver apu_pm_driver = {
+       .probe = apu_pm_probe,
+       .driver = {
+               .name = "mtk-apu-pm",
+               .suppress_bind_attrs = true,
+               .of_match_table = apu_pm_of_match,
+       },
+};
+builtin_platform_driver(apu_pm_driver);
+
-- 
2.18.0

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