diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/bus/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/bus/Makefile | 1 | ||||
| -rw-r--r-- | drivers/bus/simple-pm-bus.c | 58 |
3 files changed, 72 insertions, 0 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 626960819e6d..7e9c2674af81 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -58,6 +58,19 @@ config OMAP_OCP2SCP OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via OCP2SCP. +config SIMPLE_PM_BUS + bool "Simple Power-Managed Bus Driver" + depends on OF && PM + depends on ARCH_SHMOBILE || COMPILE_TEST + help + Driver for transparent busses that don't need a real driver, but + where the bus controller is part of a PM domain, or under the control + of a functional clock, and thus relies on runtime PM for managing + this PM domain and/or clock. + An example of such a bus controller is the Renesas Bus State + Controller (BSC, sometimes called "LBSC within Bus Bridge", or + "External Bus Interface") as found on several Renesas ARM SoCs. + config VEXPRESS_CONFIG bool "Versatile Express configuration bus" default y if ARCH_VEXPRESS diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 3cfaf2c7f25a..e023a2bec664 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -14,4 +14,5 @@ obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o +obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c new file mode 100644 index 000000000000..c5eb46cbf388 --- /dev/null +++ b/drivers/bus/simple-pm-bus.c @@ -0,0 +1,58 @@ +/* + * Simple Power-Managed Bus Driver + * + * Copyright (C) 2014-2015 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + + +static int simple_pm_bus_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_enable(&pdev->dev); + + if (np) + of_platform_populate(np, NULL, NULL, &pdev->dev); + + return 0; +} + +static int simple_pm_bus_remove(struct platform_device *pdev) +{ + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_disable(&pdev->dev); + return 0; +} + +static const struct of_device_id simple_pm_bus_of_match[] = { + { .compatible = "simple-pm-bus", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match); + +static struct platform_driver simple_pm_bus_driver = { + .probe = simple_pm_bus_probe, + .remove = simple_pm_bus_remove, + .driver = { + .name = "simple-pm-bus", + .of_match_table = simple_pm_bus_of_match, + }, +}; + +module_platform_driver(simple_pm_bus_driver); + +MODULE_DESCRIPTION("Simple Power-Managed Bus Driver"); +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); +MODULE_LICENSE("GPL v2"); |