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bcm2835-pm: Move bcm2835-watchdog's DT probe to an MFD.

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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 <eric@anholt.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
This commit is contained in:
Eric Anholt 2018-12-12 15:51:47 -08:00 committed by Stefan Wahren
parent fbeab182b1
commit 5e6acc3e67
5 changed files with 88 additions and 17 deletions
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1
arch/arm/mach-bcm/Kconfig
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@ -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.

1
drivers/mfd/Makefile
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@ -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

64
drivers/mfd/bcm2835-pm.c Normal file
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@ -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 <eric@anholt.net>");
MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
MODULE_LICENSE("GPL");

26
drivers/watchdog/bcm2835_wdt.c
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@ -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);

13
include/linux/mfd/bcm2835-pm.h Normal file
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@ -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 */