[PATCH v3 12/18] pmdomain: st: ux500: Control DB8500 EPODs
Linus Walleij
linusw at kernel.org
Sun Sep 20 15:48:18 PDT 2026
Move the DB8500 EPOD state handling into the Ux500 power-domain driver.
Keep the old regulator driver mutually exclusive with the pmdomain driver.
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw at kernel.org>
---
arch/arm/mach-ux500/Kconfig | 2 +-
drivers/pmdomain/st/ste-ux500-pm-domain.c | 355 +++++++++++++++++++++---------
drivers/regulator/Kconfig | 1 +
3 files changed, 254 insertions(+), 104 deletions(-)
diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index c18def269137..56636c993f49 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -26,7 +26,7 @@ menuconfig ARCH_U8500
select PL310_ERRATA_753970 if CACHE_L2X0
select PM_GENERIC_DOMAINS if PM
select REGULATOR
- select REGULATOR_DB8500_PRCMU
+ select UX500_PM_DOMAIN
select REGULATOR_FIXED_VOLTAGE
select SOC_BUS
select RESET_CONTROLLER
diff --git a/drivers/pmdomain/st/ste-ux500-pm-domain.c b/drivers/pmdomain/st/ste-ux500-pm-domain.c
index d90a563cd6f3..b31a36a4acd1 100644
--- a/drivers/pmdomain/st/ste-ux500-pm-domain.c
+++ b/drivers/pmdomain/st/ste-ux500-pm-domain.c
@@ -6,174 +6,292 @@
*
* Implements PM domains using the generic PM domain for ux500.
*/
+#include <linux/cleanup.h>
#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/printk.h>
-#include <linux/slab.h>
#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/mfd/db8500-prcmu.h>
+#include <linux/mutex.h>
#include <linux/of.h>
+#include <linux/platform_device.h>
#include <linux/pm_domain.h>
+#include <linux/slab.h>
#include <dt-bindings/arm/ux500_pm_domains.h>
#define NR_DOMAINS (DOMAIN_ESRAM_34 + 1)
+#define UX500_EPOD_NONE NUM_EPOD_ID
-static int pd_power_off(struct generic_pm_domain *domain)
+/**
+ * struct dbx500_powerdomain_info - dbx500 power domain information
+ * @genpd: generic power domain
+ * @epod_id: id for EPOD (power domain)
+ * @is_ramret: RAM retention switch for EPOD (power domain)
+ */
+struct dbx500_powerdomain_info {
+ struct generic_pm_domain genpd;
+ u16 epod_id;
+ bool is_ramret;
+};
+
+static DEFINE_MUTEX(ux500_pd_lock);
+static bool epod_on[NUM_EPOD_ID];
+static bool epod_ramret[NUM_EPOD_ID];
+
+static int enable_epod(u16 epod_id, bool ramret)
{
- /*
- * Handle the gating of the PM domain regulator here.
- *
- * Drivers/subsystems handling devices in the PM domain needs to perform
- * register context save/restore from their respective runtime PM
- * callbacks, to be able to enable PM domain gating/ungating.
- */
+ int ret;
+
+ if (ramret) {
+ if (!epod_on[epod_id]) {
+ ret = db8500_prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
+ if (ret < 0)
+ return ret;
+ }
+ epod_ramret[epod_id] = true;
+ } else {
+ ret = db8500_prcmu_set_epod(epod_id, EPOD_STATE_ON);
+ if (ret < 0)
+ return ret;
+ epod_on[epod_id] = true;
+ }
+
return 0;
}
-static int pd_power_on(struct generic_pm_domain *domain)
+static int disable_epod(u16 epod_id, bool ramret)
{
- /*
- * Handle the ungating of the PM domain regulator here.
- *
- * Drivers/subsystems handling devices in the PM domain needs to perform
- * register context save/restore from their respective runtime PM
- * callbacks, to be able to enable PM domain gating/ungating.
- */
+ int ret;
+
+ if (ramret) {
+ if (!epod_on[epod_id]) {
+ ret = db8500_prcmu_set_epod(epod_id, EPOD_STATE_OFF);
+ if (ret < 0)
+ return ret;
+ }
+ epod_ramret[epod_id] = false;
+ } else {
+ if (epod_ramret[epod_id]) {
+ ret = db8500_prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = db8500_prcmu_set_epod(epod_id, EPOD_STATE_OFF);
+ if (ret < 0)
+ return ret;
+ }
+ epod_on[epod_id] = false;
+ }
+
return 0;
}
+
+static int pd_power_off(struct generic_pm_domain *domain)
+{
+ struct dbx500_powerdomain_info *info =
+ container_of(domain, struct dbx500_powerdomain_info, genpd);
+ int ret = 0;
+
+ guard(mutex)(&ux500_pd_lock);
+ if (info->epod_id < NUM_EPOD_ID)
+ ret = disable_epod(info->epod_id, info->is_ramret);
+
+ return ret;
+}
+
+static int pd_power_on(struct generic_pm_domain *domain)
+{
+ struct dbx500_powerdomain_info *info =
+ container_of(domain, struct dbx500_powerdomain_info, genpd);
+ int ret = 0;
+
+ guard(mutex)(&ux500_pd_lock);
+ if (info->epod_id < NUM_EPOD_ID)
+ ret = enable_epod(info->epod_id, info->is_ramret);
+
+ return ret;
+}
+
/*
* Apart from these voltage domains there is also VSAFE which is always
* on. Vape_esram0_pwr for eSRAM0 is connected to VSAFE.
*/
-static struct generic_pm_domain ux500_pm_domain_vape = {
+static struct dbx500_powerdomain_info ux500_pm_domain_vape = {
/* Vape_pwr */
- .name = "VAPE", /* 0.95 .. 1.20 V */
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "VAPE", /* 0.95 .. 1.20 V */
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_varm = {
- .name = "VARM",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_varm = {
+ .genpd = {
+ .name = "VARM",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_vmodem = {
- .name = "VMODEM",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vmodem = {
+ .genpd = {
+ .name = "VMODEM",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_vpll = {
- .name = "VPLL", /* 1.8 V */
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vpll = {
+ .genpd = {
+ .name = "VPLL", /* 1.8 V */
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
/*
* CHECKME: as these are used directly by peripherals as regulators,
* perhaps they should stay in the regulator subsystem?
*/
-static struct generic_pm_domain ux500_pm_domain_vsmps1 = {
- .name = "VSMPS1", /* Also called VIO (1.2V) */
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vsmps1 = {
+ .genpd = {
+ .name = "VSMPS1", /* Also called VIO (1.2V) */
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_vsmps2 = {
- .name = "VSMPS2", /* Also called VIO (1.8V) */
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vsmps2 = {
+ .genpd = {
+ .name = "VSMPS2", /* Also called VIO (1.8V) */
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_vsmps3 = {
- .name = "VSMPS3",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vsmps3 = {
+ .genpd = {
+ .name = "VSMPS3",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
-static struct generic_pm_domain ux500_pm_domain_vrf1 = {
- .name = "VRF1",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+static struct dbx500_powerdomain_info ux500_pm_domain_vrf1 = {
+ .genpd = {
+ .name = "VRF1",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = UX500_EPOD_NONE,
};
/* The following are technically children of VAPE */
-static struct generic_pm_domain ux500_pm_domain_sva_mmdsp = {
+static struct dbx500_powerdomain_info ux500_pm_domain_sva_mmdsp = {
/* Vape_SVA_MMDSP_pwr */
- .name = "SVA_MMDSP",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "SVA_MMDSP",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_SVAMMDSP,
};
-static struct generic_pm_domain ux500_pm_domain_sva_pipe = {
+static struct dbx500_powerdomain_info ux500_pm_domain_sva_pipe = {
/* Vape_SVA_pwr */
- .name = "SVA_PIPE",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "SVA_PIPE",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_SVAPIPE,
};
-static struct generic_pm_domain ux500_pm_domain_sia_mmdsp = {
+static struct dbx500_powerdomain_info ux500_pm_domain_sia_mmdsp = {
/* Vape_SIA_MMDSP_pwr */
- .name = "SIA_MMDSP",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "SIA_MMDSP",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_SIAMMDSP,
};
-static struct generic_pm_domain ux500_pm_domain_sia_pipe = {
+static struct dbx500_powerdomain_info ux500_pm_domain_sia_pipe = {
/* Vape_SIA_pwr */
- .name = "SIA_PIPE",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "SIA_PIPE",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_SIAPIPE,
};
-static struct generic_pm_domain ux500_pm_domain_sga = {
+static struct dbx500_powerdomain_info ux500_pm_domain_sga = {
/* Vape_SGA_pwr */
- .name = "SGA",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "SGA",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_SGA,
};
-static struct generic_pm_domain ux500_pm_domain_b2r2_mcde = {
+static struct dbx500_powerdomain_info ux500_pm_domain_b2r2_mcde = {
/* Vape_DSS_pwr DSS (display subsystem) */
- .name = "B2R2_MCDE",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "B2R2_MCDE",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_B2R2_MCDE,
};
-static struct generic_pm_domain ux500_pm_domain_esram_12 = {
+static struct dbx500_powerdomain_info ux500_pm_domain_esram_12 = {
/* Vape_esram1_pwr, Vape_esram2_pwr */
- .name = "ESRAM_12",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "ESRAM_12",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_ESRAM12,
};
-static struct generic_pm_domain ux500_pm_domain_esram_34 = {
+static struct dbx500_powerdomain_info ux500_pm_domain_esram_34 = {
/* Vape_esram3_pwr, Vape_esram4_pwr */
- .name = "ESRAM_34",
- .power_off = pd_power_off,
- .power_on = pd_power_on,
+ .genpd = {
+ .name = "ESRAM_34",
+ .power_off = pd_power_off,
+ .power_on = pd_power_on,
+ },
+ .epod_id = EPOD_ID_ESRAM34,
};
static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
- [DOMAIN_VAPE] = &ux500_pm_domain_vape,
- [DOMAIN_VARM] = &ux500_pm_domain_varm,
- [DOMAIN_VMODEM] = &ux500_pm_domain_vmodem,
- [DOMAIN_VPLL] = &ux500_pm_domain_vpll,
- [DOMAIN_VSMPS1] = &ux500_pm_domain_vsmps1,
- [DOMAIN_VSMPS2] = &ux500_pm_domain_vsmps2,
- [DOMAIN_VSMPS3] = &ux500_pm_domain_vsmps3,
- [DOMAIN_VRF1] = &ux500_pm_domain_vrf1,
- [DOMAIN_SVA_MMDSP] = &ux500_pm_domain_sva_mmdsp,
- [DOMAIN_SVA_PIPE] = &ux500_pm_domain_sva_pipe,
- [DOMAIN_SIA_MMDSP] = &ux500_pm_domain_sia_mmdsp,
- [DOMAIN_SIA_PIPE] = &ux500_pm_domain_sia_pipe,
- [DOMAIN_SGA] = &ux500_pm_domain_sga,
- [DOMAIN_B2R2_MCDE] = &ux500_pm_domain_b2r2_mcde,
- [DOMAIN_ESRAM_12] = &ux500_pm_domain_esram_12,
- [DOMAIN_ESRAM_34] = &ux500_pm_domain_esram_34,
+ [DOMAIN_VAPE] = &ux500_pm_domain_vape.genpd,
+ [DOMAIN_VARM] = &ux500_pm_domain_varm.genpd,
+ [DOMAIN_VMODEM] = &ux500_pm_domain_vmodem.genpd,
+ [DOMAIN_VPLL] = &ux500_pm_domain_vpll.genpd,
+ [DOMAIN_VSMPS1] = &ux500_pm_domain_vsmps1.genpd,
+ [DOMAIN_VSMPS2] = &ux500_pm_domain_vsmps2.genpd,
+ [DOMAIN_VSMPS3] = &ux500_pm_domain_vsmps3.genpd,
+ [DOMAIN_VRF1] = &ux500_pm_domain_vrf1.genpd,
+ [DOMAIN_SVA_MMDSP] = &ux500_pm_domain_sva_mmdsp.genpd,
+ [DOMAIN_SVA_PIPE] = &ux500_pm_domain_sva_pipe.genpd,
+ [DOMAIN_SIA_MMDSP] = &ux500_pm_domain_sia_mmdsp.genpd,
+ [DOMAIN_SIA_PIPE] = &ux500_pm_domain_sia_pipe.genpd,
+ [DOMAIN_SGA] = &ux500_pm_domain_sga.genpd,
+ [DOMAIN_B2R2_MCDE] = &ux500_pm_domain_b2r2_mcde.genpd,
+ [DOMAIN_ESRAM_12] = &ux500_pm_domain_esram_12.genpd,
+ [DOMAIN_ESRAM_34] = &ux500_pm_domain_esram_34.genpd,
};
static const struct of_device_id ux500_pm_domain_matches[] = {
@@ -186,11 +304,12 @@ static int ux500_pm_domains_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct genpd_onecell_data *genpd_data;
int i;
+ int ret;
if (!np)
return -ENODEV;
- genpd_data = kzalloc_obj(*genpd_data);
+ genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL);
if (!genpd_data)
return -ENOMEM;
@@ -198,14 +317,44 @@ static int ux500_pm_domains_probe(struct platform_device *pdev)
genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
- pm_genpd_init(ux500_pm_domains[i], NULL, false);
+ pm_genpd_init(ux500_pm_domains[i], NULL, true);
+
+ ret = of_genpd_add_provider_onecell(np, genpd_data);
+ if (ret)
+ goto remove_genpds;
+
+ ret = of_genpd_add_child_ids(np, genpd_data);
+ if (ret < 0)
+ goto del_provider;
+
+ platform_set_drvdata(pdev, genpd_data);
- of_genpd_add_provider_onecell(np, genpd_data);
return 0;
+
+del_provider:
+ of_genpd_del_provider(np);
+remove_genpds:
+ while (i--)
+ pm_genpd_remove(ux500_pm_domains[i]);
+
+ return ret;
+}
+
+static void ux500_pm_domains_remove(struct platform_device *pdev)
+{
+ struct genpd_onecell_data *genpd_data = platform_get_drvdata(pdev);
+ int i;
+
+ of_genpd_remove_child_ids(pdev->dev.of_node, genpd_data);
+ of_genpd_del_provider(pdev->dev.of_node);
+
+ for (i = genpd_data->num_domains - 1; i >= 0; i--)
+ pm_genpd_remove(genpd_data->domains[i]);
}
static struct platform_driver ux500_pm_domains_driver = {
.probe = ux500_pm_domains_probe,
+ .remove = ux500_pm_domains_remove,
.driver = {
.name = "ux500_pm_domains",
.of_match_table = ux500_pm_domain_matches,
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 89789ac7a786..851e1a8fc22f 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -414,6 +414,7 @@ config REGULATOR_DBX500_PRCMU
config REGULATOR_DB8500_PRCMU
bool "ST-Ericsson DB8500 Voltage Domain Regulators"
depends on MFD_DB8500_PRCMU
+ depends on !UX500_PM_DOMAIN
select REGULATOR_DBX500_PRCMU
help
This driver supports the voltage domain regulators controlled by the
--
2.55.0
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