--- /dev/null
+From 90964ab2d00546a59086ffd08964da3d2a5cefc9 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Wed, 12 Dec 2018 15:51:47 -0800
+Subject: [PATCH] bcm2835-pm: Move bcm2835-watchdog's DT probe to an
+ MFD.
+
+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>
+(cherry picked from commit 5e6acc3e678ed3db746ab4fb53a980861cd711b6)
+---
+ drivers/mfd/Makefile | 1 +
+ drivers/mfd/bcm2835-pm.c | 64 ++++++++++++++++++++++++++++++++++
+ drivers/watchdog/bcm2835_wdt.c | 26 +++++---------
+ include/linux/mfd/bcm2835-pm.h | 13 +++++++
+ 4 files changed, 87 insertions(+), 17 deletions(-)
+ create mode 100644 drivers/mfd/bcm2835-pm.c
+ create mode 100644 include/linux/mfd/bcm2835-pm.h
+
+--- a/drivers/mfd/Makefile
++++ b/drivers/mfd/Makefile
+@@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_88PM805) += 88pm805.o 8
+ obj-$(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
+--- /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 <eric@anholt.net>");
++MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
++MODULE_LICENSE("GPL");
+--- 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>
+@@ -41,6 +42,8 @@ struct bcm2835_wdt {
+ spinlock_t lock;
+ };
+
++static struct bcm2835_wdt *bcm2835_power_off_wdt;
++
+ static unsigned int heartbeat;
+ static bool nowayout = WATCHDOG_NOWAYOUT;
+
+@@ -163,10 +166,7 @@ static struct watchdog_device bcm2835_wd
+ */
+ 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;
+
+ /* Partition 63 tells the firmware that this is a halt */
+ __bcm2835_restart(wdt, 63);
+@@ -174,7 +174,7 @@ 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;
+@@ -186,10 +186,7 @@ static int bcm2835_wdt_probe(struct plat
+
+ 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);
+@@ -216,8 +213,10 @@ static int bcm2835_wdt_probe(struct plat
+ 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;
+@@ -231,18 +230,11 @@ static int bcm2835_wdt_remove(struct pla
+ 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);
+--- /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 */
projects / openwrt / staging / chunkeey.git / blobdiff