193 lines
5.4 KiB
Diff
193 lines
5.4 KiB
Diff
From 0d162ed61018cda930bb77680ab88b63633d5ce0 Mon Sep 17 00:00:00 2001
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From: Romuald JEANNE <romuald.jeanne@st.com>
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Date: Tue, 13 Nov 2018 12:29:27 +0100
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Subject: [PATCH 14/52] ARM: stm32mp1-r0-rc1: WATCHDOG
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---
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drivers/watchdog/Kconfig | 12 ++++
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drivers/watchdog/Makefile | 1 +
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drivers/watchdog/stpmic1_wdt.c | 139 +++++++++++++++++++++++++++++++++++++++++
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3 files changed, 152 insertions(+)
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create mode 100644 drivers/watchdog/stpmic1_wdt.c
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diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
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index 5ea8909..6d2ffef 100644
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -806,6 +806,18 @@ config STM32_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called stm32_iwdg.
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+config STPMIC1_WATCHDOG
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+ tristate "STPMIC1 PMIC watchdog support"
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+ depends on MFD_STPMIC1
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+ select WATCHDOG_CORE
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+ help
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+ Say Y here to include watchdog support embedded into STPMIC1 PMIC.
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+ If the watchdog timer expires, stpmic1 will shut down all its power
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+ supplies.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called spmic1_wdt.
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+
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config UNIPHIER_WATCHDOG
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tristate "UniPhier watchdog support"
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depends on ARCH_UNIPHIER || COMPILE_TEST
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diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
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index bf92e7b..2649cf3 100644
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -217,3 +217,4 @@ obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
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obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
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obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o
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obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
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+obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o
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diff --git a/drivers/watchdog/stpmic1_wdt.c b/drivers/watchdog/stpmic1_wdt.c
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new file mode 100644
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index 0000000..a6cbc27
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--- /dev/null
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+++ b/drivers/watchdog/stpmic1_wdt.c
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@@ -0,0 +1,139 @@
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+// SPDX-License-Identifier: GPL-2.0
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+// Copyright (C) STMicroelectronics 2018
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+// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
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+
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+#include <linux/kernel.h>
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+#include <linux/mfd/stpmic1.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/of.h>
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+#include <linux/regmap.h>
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+#include <linux/slab.h>
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+#include <linux/watchdog.h>
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+
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+/* WATCHDOG CONTROL REGISTER bit */
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+#define WDT_START BIT(0)
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+#define WDT_PING BIT(1)
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+#define WDT_START_MASK BIT(0)
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+#define WDT_PING_MASK BIT(1)
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+#define WDT_STOP 0
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+
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+#define PMIC_WDT_MIN_TIMEOUT 1
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+#define PMIC_WDT_MAX_TIMEOUT 256
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+#define PMIC_WDT_DEFAULT_TIMEOUT 30
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+
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+static bool nowayout = WATCHDOG_NOWAYOUT;
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+module_param(nowayout, bool, 0);
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+MODULE_PARM_DESC(nowayout,
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+ "Watchdog cannot be stopped once started (default="
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+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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+
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+struct stpmic1_wdt {
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+ struct stpmic1 *pmic;
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+ struct watchdog_device wdtdev;
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+};
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+
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+static int pmic_wdt_start(struct watchdog_device *wdd)
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+{
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+ struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
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+
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+ return regmap_update_bits(wdt->pmic->regmap,
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+ WCHDG_CR, WDT_START_MASK, WDT_START);
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+}
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+
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+static int pmic_wdt_stop(struct watchdog_device *wdd)
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+{
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+ struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
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+
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+ return regmap_update_bits(wdt->pmic->regmap,
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+ WCHDG_CR, WDT_START_MASK, WDT_STOP);
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+}
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+
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+static int pmic_wdt_ping(struct watchdog_device *wdd)
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+{
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+ struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
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+
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+ return regmap_update_bits(wdt->pmic->regmap,
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+ WCHDG_CR, WDT_PING_MASK, WDT_PING);
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+}
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+
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+static int pmic_wdt_set_timeout(struct watchdog_device *wdd,
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+ unsigned int timeout)
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+{
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+ struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
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+
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+ wdd->timeout = timeout;
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+ /* timeout is equal to register value + 1 */
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+ return regmap_write(wdt->pmic->regmap, WCHDG_TIMER_CR, timeout - 1);
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+}
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+
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+static const struct watchdog_info pmic_watchdog_info = {
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+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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+ .identity = "STPMIC1 PMIC Watchdog",
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+};
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+
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+static const struct watchdog_ops pmic_watchdog_ops = {
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+ .owner = THIS_MODULE,
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+ .start = pmic_wdt_start,
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+ .stop = pmic_wdt_stop,
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+ .ping = pmic_wdt_ping,
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+ .set_timeout = pmic_wdt_set_timeout,
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+};
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+
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+static int pmic_wdt_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+ struct stpmic1 *pmic;
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+ struct stpmic1_wdt *wdt;
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+
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+ if (!pdev->dev.parent)
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+ return -EINVAL;
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+
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+ pmic = dev_get_drvdata(pdev->dev.parent);
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+ if (!pmic)
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+ return -EINVAL;
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+
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+ wdt = devm_kzalloc(&pdev->dev, sizeof(struct stpmic1_wdt), GFP_KERNEL);
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+ if (!wdt)
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+ return -ENOMEM;
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+
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+ wdt->pmic = pmic;
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+
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+ wdt->wdtdev.info = &pmic_watchdog_info;
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+ wdt->wdtdev.ops = &pmic_watchdog_ops;
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+ wdt->wdtdev.min_timeout = PMIC_WDT_MIN_TIMEOUT;
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+ wdt->wdtdev.max_timeout = PMIC_WDT_MAX_TIMEOUT;
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+
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+ wdt->wdtdev.timeout = PMIC_WDT_DEFAULT_TIMEOUT;
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+ watchdog_init_timeout(&wdt->wdtdev, 0, &pdev->dev);
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+
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+ watchdog_set_nowayout(&wdt->wdtdev, nowayout);
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+ watchdog_set_drvdata(&wdt->wdtdev, wdt);
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+
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+ ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdtdev);
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+ if (ret)
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+ return ret;
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+
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+ dev_dbg(wdt->pmic->dev, "PMIC Watchdog driver probed\n");
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+ return 0;
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+}
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+
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+static const struct of_device_id of_pmic_wdt_match[] = {
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+ { .compatible = "st,stpmic1-wdt" },
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+ { },
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+};
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+
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+MODULE_DEVICE_TABLE(of, of_pmic_wdt_match);
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+
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+static struct platform_driver stpmic1_wdt_driver = {
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+ .probe = pmic_wdt_probe,
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+ .driver = {
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+ .name = "stpmic1-wdt",
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+ .of_match_table = of_pmic_wdt_match,
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+ },
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+};
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+module_platform_driver(stpmic1_wdt_driver);
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+
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+MODULE_DESCRIPTION("Watchdog driver for STPMIC1 device");
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+MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
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+MODULE_LICENSE("GPL v2");
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--
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2.7.4
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