Re: [PATCH 02/12] soc: mediatek: Add MediaTek SCPSYS power domains

Weiyi Lu
2020-09-25T10:25:37Z

On Thu, 2020-09-10 at 19:28 +0200, Enric Balletbo i Serra wrote:
> The System Control Processor System (SCPSYS) has several power management
> related tasks in the system. This driver implements support to handle
> the different power domains supported in order to meet high performance
> and low power requirements.
>
> Co-developed-by: Matthias Brugger <mbrugger@suse.com>
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
>
> drivers/soc/mediatek/Kconfig | 13 +
> drivers/soc/mediatek/Makefile | 1 +
> drivers/soc/mediatek/mtk-pm-domains.c | 626 ++++++++++++++++++++++++++
> 3 files changed, 640 insertions(+)
> create mode 100644 drivers/soc/mediatek/mtk-pm-domains.c
>
> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> index 59a56cd790ec..68d800f9e4a5 100644
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -44,6 +44,19 @@ config MTK_SCPSYS
> Say yes here to add support for the MediaTek SCPSYS power domain
> driver.
>
> +config MTK_SCPSYS_PM_DOMAINS
> + bool "MediaTek SCPSYS generic power domain"
> + default ARCH_MEDIATEK
> + depends on PM
> + depends on MTK_INFRACFG
> + select PM_GENERIC_DOMAINS
> + select REGMAP
> + help
> + Say y here to enable power domain support.
> + In order to meet high performance and low power requirements, the System
> + Control Processor System (SCPSYS) has several power management related
> + tasks in the system.
> +
> config MTK_MMSYS
> bool "MediaTek MMSYS Support"
> default ARCH_MEDIATEK
> diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> index 01f9f873634a..1e60fb4f89d4 100644
> --- a/drivers/soc/mediatek/Makefile
> +++ b/drivers/soc/mediatek/Makefile
> @@ -3,4 +3,5 @@ obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
> obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
> obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
> obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
> +obj-$(CONFIG_MTK_SCPSYS_PM_DOMAINS) += mtk-pm-domains.o
> obj-$(CONFIG_MTK_MMSYS) += mtk-mmsys.o
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> new file mode 100644
> index 000000000000..db631dbaf2e3
> --- /dev/null
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -0,0 +1,626 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2020 Collabora Ltd.
> + */
> +#include <linux/clk.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_clk.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/soc/mediatek/infracfg.h>
> +
> +#include <dt-bindings/power/mt8173-power.h>
> +
> +#define MTK_POLL_DELAY_US 10
> +#define MTK_POLL_TIMEOUT USEC_PER_SEC
> +
> +#define MTK_SCPD_ACTIVE_WAKEUP BIT(0)
> +#define MTK_SCPD_FWAIT_SRAM BIT(1)
> +#define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x))
> +
> +#define SPM_VDE_PWR_CON 0x0210
> +#define SPM_MFG_PWR_CON 0x0214
> +#define SPM_VEN_PWR_CON 0x0230
> +#define SPM_ISP_PWR_CON 0x0238
> +#define SPM_DIS_PWR_CON 0x023c
> +#define SPM_VEN2_PWR_CON 0x0298
> +#define SPM_AUDIO_PWR_CON 0x029c
> +#define SPM_MFG_2D_PWR_CON 0x02c0
> +#define SPM_MFG_ASYNC_PWR_CON 0x02c4
> +#define SPM_USB_PWR_CON 0x02cc
> +

If me, I'd choose to write directly into the data of each SoC now
because it's inconsistent on most MediatTek chips.

> +#define SPM_PWR_STATUS 0x060c
> +#define SPM_PWR_STATUS_2ND 0x0610
> +
> +#define PWR_RST_B_BIT BIT(0)
> +#define PWR_ISO_BIT BIT(1)
> +#define PWR_ON_BIT BIT(2)
> +#define PWR_ON_2ND_BIT BIT(3)
> +#define PWR_CLK_DIS_BIT BIT(4)
> +
> +#define PWR_STATUS_DISP BIT(3)
> +#define PWR_STATUS_MFG BIT(4)
> +#define PWR_STATUS_ISP BIT(5)
> +#define PWR_STATUS_VDEC BIT(7)
> +#define PWR_STATUS_VENC_LT BIT(20)
> +#define PWR_STATUS_VENC BIT(21)
> +#define PWR_STATUS_MFG_2D BIT(22)
> +#define PWR_STATUS_MFG_ASYNC BIT(23)
> +#define PWR_STATUS_AUDIO BIT(24)
> +#define PWR_STATUS_USB BIT(25)
> +

same here for the status bits.

> +struct scpsys_bus_prot_data {
> + u32 bus_prot_mask;
> + bool bus_prot_reg_update;
> +};
> +
> +/**
> + * struct scpsys_domain_data - scp domain data for power on/off flow
> + * @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.
> + * @caps: The flag for active wake-up action.
> + * @bp_infracfg: bus protection for infracfg subsystem
> + */
> +struct scpsys_domain_data {
> + u32 sta_mask;
> + int ctl_offs;
> + u32 sram_pdn_bits;
> + u32 sram_pdn_ack_bits;
> + u8 caps;
> + const struct scpsys_bus_prot_data bp_infracfg;
> +};
> +
> +struct scpsys_domain {
> + struct generic_pm_domain genpd;
> + const struct scpsys_domain_data *data;
> + struct scpsys *scpsys;
> + int num_clks;
> + struct clk_bulk_data *clks;
> + struct regmap *infracfg;

Could we move
struct regmap *infracfg;
back to struct scpsys? It seems we need to set this property many times
under each power domain sub node in device tree?

> +};
> +
> +struct scpsys_soc_data {
> + const struct scpsys_domain_data *domains;
> + int num_domains;
> + int pwr_sta_offs;
> + int pwr_sta2nd_offs;
> +};
> +
> +struct scpsys {
> + struct device *dev;
> + void __iomem *base;
> + const struct scpsys_soc_data *soc_data;
> + struct genpd_onecell_data pd_data;
> + struct generic_pm_domain *domains[];
> +};
> +
> +#define to_scpsys_domain(gpd) container_of(gpd, struct scpsys_domain, genpd)
> +
> +static int scpsys_domain_is_on(struct scpsys_domain *pd)
> +{
> + struct scpsys *scpsys = pd->scpsys;
> +
> + u32 status = readl(scpsys->base + scpsys->soc_data->pwr_sta_offs) & pd->data->sta_mask;
> + u32 status2 = readl(scpsys->base + scpsys->soc_data->pwr_sta2nd_offs) & pd->data->sta_mask;
> +
> + /*
> + * A domain is on when both status bits are set. If only one is set
> + * return an error. This happens while powering up a domain
> + */
> +
> + if (status && status2)
> + return true;
> + if (!status && !status2)
> + return false;
> +
> + return -EINVAL;
> +}
> +
> +static int scpsys_sram_enable(struct scpsys_domain *pd, void __iomem *ctl_addr)
> +{
> + u32 pdn_ack = pd->data->sram_pdn_ack_bits;
> + u32 val;
> + int tmp;
> + int ret;
> +
> + val = readl(ctl_addr);
> + val &= ~pd->data->sram_pdn_bits;
> + writel(val, ctl_addr);
> +
> + /* Either wait until SRAM_PDN_ACK all 1 or 0 */
> + ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0, MTK_POLL_DELAY_US,
> + MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int scpsys_sram_disable(struct scpsys_domain *pd, void __iomem *ctl_addr)
> +{
> + u32 pdn_ack = pd->data->sram_pdn_ack_bits;
> + u32 val;
> + int tmp;
> +
> + val = readl(ctl_addr);
> + val |= pd->data->sram_pdn_bits;
> + writel(val, ctl_addr);
> +
> + /* Either wait until SRAM_PDN_ACK all 1 or 0 */
> + return readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack, MTK_POLL_DELAY_US,
> + MTK_POLL_TIMEOUT);
> +}
> +
> +static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> +{
> + const struct scpsys_bus_prot_data *bp_data = &pd->data->bp_infracfg;
> +
> + if (!bp_data->bus_prot_mask)
> + return 0;
> +
> + return mtk_infracfg_set_bus_protection(pd->infracfg, bp_data->bus_prot_mask,
> + bp_data->bus_prot_reg_update);
> +}
> +
> +static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> +{
> + const struct scpsys_bus_prot_data *bp_data = &pd->data->bp_infracfg;
> +
> + if (!bp_data->bus_prot_mask)
> + return 0;
> +
> + return mtk_infracfg_clear_bus_protection(pd->infracfg, bp_data->bus_prot_mask,
> + bp_data->bus_prot_reg_update);
> +}
> +
> +static int scpsys_power_on(struct generic_pm_domain *genpd)
> +{
> + struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
> + struct scpsys *scpsys = pd->scpsys;
> + void __iomem *ctl_addr = scpsys->base + pd->data->ctl_offs;
> + int ret, tmp;
> + u32 val;
> +
> + ret = clk_bulk_enable(pd->num_clks, pd->clks);
> + if (ret)
> + return ret;
> +
> + /* subsys power on */
> + val = readl(ctl_addr);
> + val |= PWR_ON_BIT;
> + writel(val, ctl_addr);
> + val |= PWR_ON_2ND_BIT;
> + writel(val, ctl_addr);
> +
> + /* wait until PWR_ACK = 1 */
> + ret = readx_poll_timeout(scpsys_domain_is_on, pd, tmp, tmp > 0, MTK_POLL_DELAY_US,
> + MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + goto err_pwr_ack;
> +
> + val &= ~PWR_CLK_DIS_BIT;
> + writel(val, ctl_addr);
> +
> + val &= ~PWR_ISO_BIT;
> + writel(val, ctl_addr);
> +
> + val |= PWR_RST_B_BIT;
> + writel(val, ctl_addr);
> +
> + ret = scpsys_sram_enable(pd, ctl_addr);
> + if (ret < 0)
> + goto err_pwr_ack;
> +
> + ret = scpsys_bus_protect_disable(pd);
> + if (ret < 0)
> + goto err_pwr_ack;
> +
> + return 0;
> +
> +err_pwr_ack:
> + clk_bulk_disable(pd->num_clks, pd->clks);
> + dev_err(scpsys->dev, "Failed to power on domain %s\n", genpd->name);
> +
> + return ret;
> +}
> +
> +static int scpsys_power_off(struct generic_pm_domain *genpd)
> +{
> + struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
> + struct scpsys *scpsys = pd->scpsys;
> + void __iomem *ctl_addr = scpsys->base + pd->data->ctl_offs;
> + int ret, tmp;
> + u32 val;
> +
> + ret = scpsys_bus_protect_enable(pd);
> + if (ret < 0)
> + return ret;
> +
> + ret = scpsys_sram_disable(pd, ctl_addr);
> + if (ret < 0)
> + return ret;
> +
> + /* subsys power off */
> + val = readl(ctl_addr);
> + val |= PWR_ISO_BIT;
> + writel(val, ctl_addr);
> +
> + val &= ~PWR_RST_B_BIT;
> + writel(val, ctl_addr);
> +
> + val |= PWR_CLK_DIS_BIT;
> + writel(val, ctl_addr);
> +
> + val &= ~PWR_ON_BIT;
> + writel(val, ctl_addr);
> +
> + val &= ~PWR_ON_2ND_BIT;
> + writel(val, ctl_addr);
> +
> + /* wait until PWR_ACK = 0 */
> + ret = readx_poll_timeout(scpsys_domain_is_on, pd, tmp, tmp == 0, MTK_POLL_DELAY_US,
> + MTK_POLL_TIMEOUT);
> + if (ret < 0)
> + return ret;
> +
> + clk_bulk_disable(pd->num_clks, pd->clks);
> +
> + return 0;
> +}
> +
> +static int scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node)
> +{
> + const struct scpsys_domain_data *domain_data;
> + struct scpsys_domain *pd;
> + int i, ret;
> + u32 id;
> +
> + ret = of_property_read_u32(node, "reg", &id);
> + if (ret) {
> + dev_err(scpsys->dev, "%pOFn: failed to retrieve domain id from reg: %d\n", node,
> + ret);
> + return -EINVAL;
> + }
> +
> + if (id >= scpsys->soc_data->num_domains) {
> + dev_err(scpsys->dev, "%pOFn: invalid domain id %d\n", node, id);
> + return -EINVAL;
> + }
> +
> + domain_data = &scpsys->soc_data->domains[id];
> + if (!domain_data) {
> + dev_err(scpsys->dev, "%pOFn: undefined domain id %d\n", node, id);
> + return -EINVAL;
> + }
> +
> + pd = devm_kzalloc(scpsys->dev, sizeof(*pd), GFP_KERNEL);
> + if (!pd)
> + return -ENOMEM;
> +
> + pd->data = domain_data;
> + pd->scpsys = scpsys;
> +
> + pd->infracfg = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg");
> + if (IS_ERR(pd->infracfg))
> + pd->infracfg = NULL;
> +
> + pd->num_clks = of_clk_get_parent_count(node);
> + if (pd->num_clks > 0) {
> + pd->clks = devm_kcalloc(scpsys->dev, pd->num_clks, sizeof(*pd->clks), GFP_KERNEL);
> + if (!pd->clks)
> + return -ENOMEM;
> + } else {
> + pd->num_clks = 0;
> + }
> +
> + for (i = 0; i < pd->num_clks; i++) {
> + pd->clks[i].clk = of_clk_get(node, i);

Is it possible to have a better way that we could use of_clk_bulk_get()?

> + if (IS_ERR(pd->clks[i].clk)) {
> + ret = PTR_ERR(pd->clks[i].clk);
> + dev_err(scpsys->dev, "%pOFn: failed to get clk at index %d: %d\n", node, i,
> + ret);
> + return ret;
> + }
> + }
> +
> + ret = clk_bulk_prepare(pd->num_clks, pd->clks);
> + if (ret)
> + goto err_put_clocks;
> +
> + /*
> + * 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 = scpsys_power_on(&pd->genpd);
> + if (ret < 0) {
> + dev_err(scpsys->dev, "failed to power on domain %pOFN with error %d\n", node, ret);
> + goto err_unprepare_clocks;
> + }
> +
> + pd->genpd.name = node->name;
> + pd->genpd.power_off = scpsys_power_off;
> + pd->genpd.power_on = scpsys_power_on;
> +
> + pm_genpd_init(&pd->genpd, NULL, false);
> +
> + scpsys->domains[id] = &pd->genpd;
> + return 0;
> +
> +err_unprepare_clocks:
> + clk_bulk_unprepare(pd->num_clks, pd->clks);
> +err_put_clocks:
> + clk_bulk_put(pd->num_clks, pd->clks);
> + devm_kfree(scpsys->dev, pd->clks);
> + pd->num_clks = 0;
> + return ret;
> +}
> +
> +static int scpsys_add_subdomain(struct scpsys *scpsys, struct device_node *parent)
> +{
> + struct device_node *child;
> + struct generic_pm_domain *child_pd, *parent_pd;
> + int ret;
> +
> + for_each_child_of_node(parent, child) {
> + u32 id;
> +
> + ret = of_property_read_u32(parent, "reg", &id);
> + if (ret) {
> + dev_err(scpsys->dev, "%pOFn: failed to get parent domain id: %d\n", child,
> + ret);
> + goto err_put_node;
> + }
> + parent_pd = scpsys->pd_data.domains[id];
> +

nit. Could we move parent outside(in front of) the loop?

> + ret = scpsys_add_one_domain(scpsys, child);
> + if (ret) {
> + dev_err(scpsys->dev, "error adding power domain for %pOFn: %d\n", child,
> + ret);
> + goto err_put_node;
> + }
> +
> + ret = of_property_read_u32(child, "reg", &id);
> + if (ret) {
> + dev_err(scpsys->dev, "%pOFn: failed to get child domain id: %d\n", child,
> + ret);
> + goto err_put_node;
> + }
> + child_pd = scpsys->pd_data.domains[id];
> +
> + ret = pm_genpd_add_subdomain(parent_pd, child_pd);
> + if (ret) {
> + dev_err(scpsys->dev, "failed to add %s subdomain to parent %s\n",
> + child_pd->name, parent_pd->name);
> + goto err_put_node;
> + } else {
> + dev_dbg(scpsys->dev, "%s add subdomain: %s\n", parent_pd->name,
> + child_pd->name);
> + }
> +
> + /* recursive call to add all subdomains */
> + ret = scpsys_add_subdomain(scpsys, child);
> + if (ret)
> + goto err_put_node;
> + }
> +
> + return 0;
> +
> +err_put_node:
> + of_node_put(child);
> + return ret;
> +}
> +
> +static void scpsys_remove_one_domain(struct scpsys_domain *pd)
> +{
> + int ret;
> +
> + /*
> + * 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_err(pd->scpsys->dev,
> + "failed to remove domain '%s' : %d - state may be inconsistent\n",
> + pd->genpd.name, ret);
> +
> + scpsys_power_off(&pd->genpd);
> +
> + clk_bulk_unprepare(pd->num_clks, pd->clks);
> + clk_bulk_put(pd->num_clks, pd->clks);
> + pd->num_clks = 0;
> +}
> +
> +static void scpsys_domain_cleanup(struct scpsys *scpsys)
> +{
> + struct generic_pm_domain *genpd;
> + struct scpsys_domain *pd;
> + int i;
> +
> + for (i = scpsys->pd_data.num_domains - 1; i >= 0; i--) {
> + genpd = scpsys->pd_data.domains[i];
> + if (genpd) {
> + pd = to_scpsys_domain(genpd);
> + scpsys_remove_one_domain(pd);
> + }
> + }
> +}
> +
> +/*
> + * MT8173 power domain support
> + */
> +
> +static const struct scpsys_domain_data scpsys_domain_data_mt8173[] = {
> + [MT8173_POWER_DOMAIN_VDEC] = {
> + .sta_mask = PWR_STATUS_VDEC,
> + .ctl_offs = SPM_VDE_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(12, 12),
> + },
> + [MT8173_POWER_DOMAIN_VENC] = {
> + .sta_mask = PWR_STATUS_VENC,
> + .ctl_offs = SPM_VEN_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + },
> + [MT8173_POWER_DOMAIN_ISP] = {
> + .sta_mask = PWR_STATUS_ISP,
> + .ctl_offs = SPM_ISP_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(13, 12),
> + },
> + [MT8173_POWER_DOMAIN_MM] = {
> + .sta_mask = PWR_STATUS_DISP,
> + .ctl_offs = SPM_DIS_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(12, 12),
> + .bp_infracfg = {
> + .bus_prot_reg_update = true,
> + .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
> + MT8173_TOP_AXI_PROT_EN_MM_M1,
> + },
> + },
> + [MT8173_POWER_DOMAIN_VENC_LT] = {
> + .sta_mask = PWR_STATUS_VENC_LT,
> + .ctl_offs = SPM_VEN2_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + },
> + [MT8173_POWER_DOMAIN_AUDIO] = {
> + .sta_mask = PWR_STATUS_AUDIO,
> + .ctl_offs = SPM_AUDIO_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + },
> + [MT8173_POWER_DOMAIN_USB] = {
> + .sta_mask = PWR_STATUS_USB,
> + .ctl_offs = SPM_USB_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + .caps = MTK_SCPD_ACTIVE_WAKEUP,
> + },
> + [MT8173_POWER_DOMAIN_MFG_ASYNC] = {
> + .sta_mask = PWR_STATUS_MFG_ASYNC,
> + .ctl_offs = SPM_MFG_ASYNC_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = 0,
> + },
> + [MT8173_POWER_DOMAIN_MFG_2D] = {
> + .sta_mask = PWR_STATUS_MFG_2D,
> + .ctl_offs = SPM_MFG_2D_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(13, 12),
> + },
> + [MT8173_POWER_DOMAIN_MFG] = {
> + .sta_mask = PWR_STATUS_MFG,
> + .ctl_offs = SPM_MFG_PWR_CON,
> + .sram_pdn_bits = GENMASK(13, 8),
> + .sram_pdn_ack_bits = GENMASK(21, 16),
> + .bp_infracfg = {
> + .bus_prot_reg_update = true,
> + .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,
> + },
> + },
> +};
> +
> +static const struct scpsys_soc_data mt8173_scpsys_data = {
> + .domains = scpsys_domain_data_mt8173,
> + .num_domains = ARRAY_SIZE(scpsys_domain_data_mt8173),
> + .pwr_sta_offs = SPM_PWR_STATUS,
> + .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND,
> +};
> +
> +static const struct of_device_id scpsys_of_match[] = {
> + {
> + .compatible = "mediatek,mt8173-power-controller",
> + .data = &mt8173_scpsys_data,
> + },
> + { }
> +};
> +
> +static int scpsys_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + const struct scpsys_soc_data *soc;
> + struct device_node *node;
> + struct scpsys *scpsys;
> + struct resource *res;
> + int ret;
> +
> + soc = of_device_get_match_data(&pdev->dev);
> + if (!soc) {
> + dev_err(&pdev->dev, "no power controller data\n");
> + return -EINVAL;
> + }
> +
> + scpsys = devm_kzalloc(dev, struct_size(scpsys, domains, soc->num_domains), GFP_KERNEL);
> + if (!scpsys)
> + return -ENOMEM;
> +
> + scpsys->dev = dev;
> + scpsys->soc_data = soc;
> +
> + scpsys->pd_data.domains = scpsys->domains;
> + scpsys->pd_data.num_domains = soc->num_domains;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + scpsys->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(scpsys->base))
> + return -ENODEV;
> +
> + ret = -ENODEV;
> + for_each_available_child_of_node(np, node) {
> + ret = scpsys_add_one_domain(scpsys, node);
> + if (ret) {
> + dev_err(dev, "failed to handle node %pOFN: %d\n", node, ret);
> + of_node_put(node);
> + goto err_cleanup_domains;
> + }
> +
> + ret = scpsys_add_subdomain(scpsys, node);
> + if (ret) {
> + dev_err(dev, "failed to add subdomain node %pOFn: %d\n", node, ret);
> + of_node_put(node);
> + goto err_cleanup_domains;
> + }
> + }
> +
> + if (ret) {
> + dev_dbg(dev, "no power domains present\n");
> + return ret;
> + }
> +
> + ret = of_genpd_add_provider_onecell(np, &scpsys->pd_data);
> + if (ret) {
> + dev_err(dev, "failed to add provider: %d\n", ret);
> + goto err_cleanup_domains;
> + }
> +
> + return 0;
> +
> +err_cleanup_domains:
> + scpsys_domain_cleanup(scpsys);
> + return ret;
> +}
> +
> +static struct platform_driver scpsys_pm_domain_driver = {
> + .probe = scpsys_probe,
> + .driver = {
> + .name = "mtk-power-controller",
> + .suppress_bind_attrs = true,
> + .of_match_table = scpsys_of_match,
> + },
> +};
> +builtin_platform_driver(scpsys_pm_domain_driver);