dm: sysreset: add watchdog-reboot driver

Add a new sysreset driver that uses the recently added watchdog support.
It performs a full SoC reset by calling wdt_expire_now op.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index b2f746494d29520bee1eb1fa1269ddb9639b257a..a6d48e8a662c7500945232dee119c700af9ac15a 100644 (file)
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -31,4 +31,10 @@ config SYSRESET_SYSCON
        help
          Reboot support for generic SYSCON mapped register reset.
 
+config SYSRESET_WATCHDOG
+       bool "Enable support for watchdog reboot driver"
+       select WDT
+       help
+         Reboot support for generic watchdog reset.
+
 endmenu

diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index bd352e754150456c3a5ab6acc352256abc8d34d9..b68381148c06e77da889adb00b09fb5432bd8b0d 100644 (file)
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -7,6 +7,7 @@
 obj-$(CONFIG_SYSRESET) += sysreset-uclass.o
 obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
+obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
 
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_ROCKCHIP_RK3036) += sysreset_rk3036.o

diff --git a/drivers/sysreset/sysreset_watchdog.c b/drivers/sysreset/sysreset_watchdog.c
new file mode 100644 (file)
index 0000000..304ed05
--- /dev/null
+++ b/drivers/sysreset/sysreset_watchdog.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <wdt.h>
+
+struct wdt_reboot_priv {
+       struct udevice *wdt;
+};
+
+static int wdt_reboot_request(struct udevice *dev, enum sysreset_t type)
+{
+       struct wdt_reboot_priv *priv = dev_get_priv(dev);
+       int ret;
+
+       ret = wdt_expire_now(priv->wdt, 0);
+       if (ret)
+               return ret;
+
+       return -EINPROGRESS;
+}
+
+static struct sysreset_ops wdt_reboot_ops = {
+       .request = wdt_reboot_request,
+};
+
+int wdt_reboot_probe(struct udevice *dev)
+{
+       struct wdt_reboot_priv *priv = dev_get_priv(dev);
+       int err;
+
+       err = uclass_get_device_by_phandle(UCLASS_WDT, dev,
+                                          "wdt", &priv->wdt);
+       if (err) {
+               error("unable to find wdt device\n");
+               return err;
+       }
+
+       return 0;
+}
+
+static const struct udevice_id wdt_reboot_ids[] = {
+       { .compatible = "wdt-reboot" },
+       { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(wdt_reboot) = {
+       .name = "wdt_reboot",
+       .id = UCLASS_SYSRESET,
+       .of_match = wdt_reboot_ids,
+       .ops = &wdt_reboot_ops,
+       .priv_auto_alloc_size = sizeof(struct wdt_reboot_priv),
+       .probe = wdt_reboot_probe,
+};