Messages in this thread Patch in this message | | | From | Max Krummenacher <> | Subject | [PATCH v1 2/5] pm: add regulator power domain controller | Date | Thu, 9 Jun 2022 17:08:48 +0200 |
| |
From: Max Krummenacher <max.krummenacher@toradex.com>
Acts as a power domain controller which switches its domain power by enabling/disabling a regulator.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com> ---
drivers/power/Kconfig | 1 + drivers/power/Makefile | 5 +- drivers/power/domain/Kconfig | 7 ++ drivers/power/domain/Makefile | 2 + drivers/power/domain/regulator-pdc.c | 112 +++++++++++++++++++++++++++ 5 files changed, 125 insertions(+), 2 deletions(-) create mode 100644 drivers/power/domain/Kconfig create mode 100644 drivers/power/domain/Makefile create mode 100644 drivers/power/domain/regulator-pdc.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 696bf77a7042..e8eebee629d5 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only +source "drivers/power/domain/Kconfig" source "drivers/power/reset/Kconfig" source "drivers/power/supply/Kconfig" diff --git a/drivers/power/Makefile b/drivers/power/Makefile index effbf0377f32..4323a8c8c328 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only -obj-$(CONFIG_POWER_RESET) += reset/ -obj-$(CONFIG_POWER_SUPPLY) += supply/ +obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain/ +obj-$(CONFIG_POWER_RESET) += reset/ +obj-$(CONFIG_POWER_SUPPLY) += supply/ diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig new file mode 100644 index 000000000000..74c50baf2df0 --- /dev/null +++ b/drivers/power/domain/Kconfig @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config POWER_DOMAIN_REGULATOR + bool "A power domain controller using a regulator for power control" + help + Say Y here to enable a power domain controller which uses a regulator + to control its power domain. diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile new file mode 100644 index 000000000000..13b3378fb11f --- /dev/null +++ b/drivers/power/domain/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_POWER_DOMAIN_REGULATOR) += regulator-pdc.o diff --git a/drivers/power/domain/regulator-pdc.c b/drivers/power/domain/regulator-pdc.c new file mode 100644 index 000000000000..e03cfe901d70 --- /dev/null +++ b/drivers/power/domain/regulator-pdc.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * A power domain controller which uses a regulator to control its power domain. + * + * Copyright 2022 Toradex + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_domain.h> +#include <linux/regulator/consumer.h> + +struct reg_pd { + struct device *dev; + struct generic_pm_domain pd; + struct regulator *supply; +}; + +static int reg_pd_power_off(struct generic_pm_domain *domain) +{ + struct reg_pd *pd = container_of(domain, struct reg_pd, pd); + + return regulator_disable(pd->supply); +} + +static int reg_pd_power_on(struct generic_pm_domain *domain) +{ + struct reg_pd *pd = container_of(domain, struct reg_pd, pd); + + return regulator_enable(pd->supply); +} + +static const struct of_device_id reg_pd_of_match[] = { + { + .compatible = "regulator-pm-pd", + }, + { }, +}; + +static int reg_pd_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct of_phandle_args child, parent; + struct reg_pd *pd; + const char *name; + int ret; + + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); + if (!pd) { + of_node_put(np); + return -ENOMEM; + } + pd->dev = dev; + + if (of_property_read_string(np, "label", &name) < 0) + name = kbasename(np->full_name); + pd->pd.name = kstrdup_const(name, GFP_KERNEL); + if (!pd->pd.name) + return -ENOMEM; + + pd->supply = devm_regulator_get(dev, "power"); + if (IS_ERR(pd->supply)) + return dev_err_probe(dev, PTR_ERR(pd->supply), + "failed to get regulator\n"); + + pd->pd.power_off = reg_pd_power_off; + pd->pd.power_on = reg_pd_power_on; + + ret = pm_genpd_init(&pd->pd, NULL, true); + if (ret) + goto err_out; + ret = of_genpd_add_provider_simple(np, &pd->pd); + if (ret) + goto err_out; + + if (of_parse_phandle_with_args(np, "power-domains", + "#power-domain-cells", 0, &parent) == 0) { + child.np = np; + child.args_count = 0; + + if (of_genpd_add_subdomain(&parent, &child)) + pr_warn("%pOF failed to add subdomain: %pOF\n", + parent.np, child.np); + else + pr_info("%pOF has as child subdomain: %pOF.\n", + parent.np, child.np); + } + + return 0; + +err_out: + dev_warn(dev, "failed to probe pd %s", pd->pd.name); + return ret; +} + +static struct platform_driver reg_pd_driver = { + .driver = { + .name = "regulator_power_domain", + .of_match_table = reg_pd_of_match, + .owner = THIS_MODULE, + }, + .probe = reg_pd_probe, +}; + +static __init int reg_pd_init(void) +{ + return platform_driver_register(®_pd_driver); +} +core_initcall(reg_pd_init); -- 2.20.1
| |