On Fri, Nov 30, 2018 at 12:27:40PM -0800, Eric Anholt wrote: > The PM block that the wdt driver was binding to actually has multiple > features we want to expose (power domains, reset, watchdog). Move the > DT attachment to a MFD driver and make WDT probe against MFD. > > Signed-off-by: Eric Anholt <[email protected]>
For watchdog: Reviewed-by: Guenter Roeck <[email protected]> > --- > > v3: don't reset bcm2835_power_off_wdt on remove, drop pm driver's > empty remove, sort includes, add a "static". > > arch/arm/mach-bcm/Kconfig | 1 + > drivers/mfd/Makefile | 1 + > drivers/mfd/bcm2835-pm.c | 64 ++++++++++++++++++++++++++++++++++ > drivers/watchdog/bcm2835_wdt.c | 26 +++++--------- > include/linux/mfd/bcm2835-pm.h | 13 +++++++ > 5 files changed, 88 insertions(+), 17 deletions(-) > create mode 100644 drivers/mfd/bcm2835-pm.c > create mode 100644 include/linux/mfd/bcm2835-pm.h > > diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig > index 25aac6ee2ab1..95242c2162a2 100644 > --- a/arch/arm/mach-bcm/Kconfig > +++ b/arch/arm/mach-bcm/Kconfig > @@ -167,6 +167,7 @@ config ARCH_BCM2835 > select BCM2835_TIMER > select PINCTRL > select PINCTRL_BCM2835 > + select MFD_CORE > help > This enables support for the Broadcom BCM2835 and BCM2836 SoCs. > This SoC is used in the Raspberry Pi and Roku 2 devices. > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 12980a4ad460..ee6fb6af655e 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_88PM805) += 88pm805.o 88pm80x.o > obj-$(CONFIG_MFD_ACT8945A) += act8945a.o > obj-$(CONFIG_MFD_SM501) += sm501.o > obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o > +obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o > obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o > obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o > cros_ec_core-objs := cros_ec.o > diff --git a/drivers/mfd/bcm2835-pm.c b/drivers/mfd/bcm2835-pm.c > new file mode 100644 > index 000000000000..53839e6a81e7 > --- /dev/null > +++ b/drivers/mfd/bcm2835-pm.c > @@ -0,0 +1,64 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * PM MFD driver for Broadcom BCM2835 > + * > + * This driver binds to the PM block and creates the MFD device for > + * the WDT driver. > + */ > + > +#include <linux/delay.h> > +#include <linux/io.h> > +#include <linux/mfd/bcm2835-pm.h> > +#include <linux/mfd/core.h> > +#include <linux/module.h> > +#include <linux/of_address.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/types.h> > +#include <linux/watchdog.h> > + > +static const struct mfd_cell bcm2835_pm_devs[] = { > + { .name = "bcm2835-wdt" }, > +}; > + > +static int bcm2835_pm_probe(struct platform_device *pdev) > +{ > + struct resource *res; > + struct device *dev = &pdev->dev; > + struct bcm2835_pm *pm; > + > + pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL); > + if (!pm) > + return -ENOMEM; > + platform_set_drvdata(pdev, pm); > + > + pm->dev = dev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + pm->base = devm_ioremap_resource(dev, res); > + if (IS_ERR(pm->base)) > + return PTR_ERR(pm->base); > + > + return devm_mfd_add_devices(dev, -1, > + bcm2835_pm_devs, > ARRAY_SIZE(bcm2835_pm_devs), > + NULL, 0, NULL); > +} > + > +static const struct of_device_id bcm2835_pm_of_match[] = { > + { .compatible = "brcm,bcm2835-pm-wdt", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match); > + > +static struct platform_driver bcm2835_pm_driver = { > + .probe = bcm2835_pm_probe, > + .driver = { > + .name = "bcm2835-pm", > + .of_match_table = bcm2835_pm_of_match, > + }, > +}; > +module_platform_driver(bcm2835_pm_driver); > + > +MODULE_AUTHOR("Eric Anholt <[email protected]>"); > +MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD"); > +MODULE_LICENSE("GPL"); > diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c > index ed05514cc2dc..1834524ae373 100644 > --- a/drivers/watchdog/bcm2835_wdt.c > +++ b/drivers/watchdog/bcm2835_wdt.c > @@ -12,6 +12,7 @@ > > #include <linux/delay.h> > #include <linux/types.h> > +#include <linux/mfd/bcm2835-pm.h> > #include <linux/module.h> > #include <linux/io.h> > #include <linux/watchdog.h> > @@ -47,6 +48,8 @@ struct bcm2835_wdt { > spinlock_t lock; > }; > > +static struct bcm2835_wdt *bcm2835_power_off_wdt; > + > static unsigned int heartbeat; > static bool nowayout = WATCHDOG_NOWAYOUT; > > @@ -148,10 +151,7 @@ static struct watchdog_device bcm2835_wdt_wdd = { > */ > static void bcm2835_power_off(void) > { > - struct device_node *np = > - of_find_compatible_node(NULL, NULL, "brcm,bcm2835-pm-wdt"); > - struct platform_device *pdev = of_find_device_by_node(np); > - struct bcm2835_wdt *wdt = platform_get_drvdata(pdev); > + struct bcm2835_wdt *wdt = bcm2835_power_off_wdt; > u32 val; > > /* > @@ -169,7 +169,7 @@ static void bcm2835_power_off(void) > > static int bcm2835_wdt_probe(struct platform_device *pdev) > { > - struct resource *res; > + struct bcm2835_pm *pm = dev_get_drvdata(pdev->dev.parent); > struct device *dev = &pdev->dev; > struct bcm2835_wdt *wdt; > int err; > @@ -181,10 +181,7 @@ static int bcm2835_wdt_probe(struct platform_device > *pdev) > > spin_lock_init(&wdt->lock); > > - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > - wdt->base = devm_ioremap_resource(dev, res); > - if (IS_ERR(wdt->base)) > - return PTR_ERR(wdt->base); > + wdt->base = pm->base; > > watchdog_set_drvdata(&bcm2835_wdt_wdd, wdt); > watchdog_init_timeout(&bcm2835_wdt_wdd, heartbeat, dev); > @@ -211,8 +208,10 @@ static int bcm2835_wdt_probe(struct platform_device > *pdev) > return err; > } > > - if (pm_power_off == NULL) > + if (pm_power_off == NULL) { > pm_power_off = bcm2835_power_off; > + bcm2835_power_off_wdt = wdt; > + } > > dev_info(dev, "Broadcom BCM2835 watchdog timer"); > return 0; > @@ -226,18 +225,11 @@ static int bcm2835_wdt_remove(struct platform_device > *pdev) > return 0; > } > > -static const struct of_device_id bcm2835_wdt_of_match[] = { > - { .compatible = "brcm,bcm2835-pm-wdt", }, > - {}, > -}; > -MODULE_DEVICE_TABLE(of, bcm2835_wdt_of_match); > - > static struct platform_driver bcm2835_wdt_driver = { > .probe = bcm2835_wdt_probe, > .remove = bcm2835_wdt_remove, > .driver = { > .name = "bcm2835-wdt", > - .of_match_table = bcm2835_wdt_of_match, > }, > }; > module_platform_driver(bcm2835_wdt_driver); > diff --git a/include/linux/mfd/bcm2835-pm.h b/include/linux/mfd/bcm2835-pm.h > new file mode 100644 > index 000000000000..b7d0ee1feffa > --- /dev/null > +++ b/include/linux/mfd/bcm2835-pm.h > @@ -0,0 +1,13 @@ > +/* SPDX-License-Identifier: GPL-2.0+ */ > + > +#ifndef BCM2835_MFD_PM_H > +#define BCM2835_MFD_PM_H > + > +#include <linux/regmap.h> > + > +struct bcm2835_pm { > + struct device *dev; > + void __iomem *base; > +}; > + > +#endif /* BCM2835_MFD_PM_H */ > -- > 2.20.0.rc1 >
