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Message-ID: <HK2PR01MB328111AB2520315A7D4A1172FA970@HK2PR01MB3281.apcprd01.prod.exchangelabs.com>
Date: Mon, 22 Jun 2020 10:03:27 +0000
From: Johnson CH Chen (陳昭勳)
<JohnsonCH.Chen@...a.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
"linux@...ck-us.net" <linux@...ck-us.net>,
Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 1/3] mfd: ds1374: Introduce Dallas/Maxim DS1374 MFD core
driver
Dallas/Maxim DS1374 is a counter designed to continuously count
time in seconds. It provides an I2C interface to the host to
access RTC clock or Alarm/Watchdog timer.
Add MFD Core driver, supporting the I2C communication to RTC and
Watchdog devices.
Signed-off-by: Johnson Chen <johnsonch.chen@...a.com>
---
drivers/mfd/Kconfig | 11 +++++
drivers/mfd/Makefile | 2 +
drivers/mfd/ds1374.c | 101 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 114 insertions(+)
create mode 100644 drivers/mfd/ds1374.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 687e9c848053..d16031f4b487 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1980,6 +1980,17 @@ config MFD_STM32_LPTIMER
To compile this driver as a module, choose M here: the
module will be called stm32-lptimer.
+config MFD_DS1374
+ tristate "Support for Dallas/Maxim DS1374"
+ depends on I2C
+ select MFD_CORE
+ help
+ Say yes here to add support for Dallas/Maxim DS1374 Semiconductor.
+ This driver provides RTC and watchdog.
+
+ This driver can also be built as a module. If so, module will be
+ called ds1374.
+
config MFD_STM32_TIMERS
tristate "Support for STM32 Timers"
depends on (ARCH_STM32 && OF) || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index bea2be419822..a6463dd4aa33 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -243,6 +243,8 @@ obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC) += intel_soc_pmic_chtwc.o
obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI) += intel_soc_pmic_chtdc_ti.o
mt6397-objs := mt6397-core.o mt6397-irq.o
obj-$(CONFIG_MFD_MT6397) += mt6397.o
+obj-$(CONFIG_MFD_DS1374) += ds1374.o
+
obj-$(CONFIG_INTEL_SOC_PMIC_MRFLD) += intel_soc_pmic_mrfld.o
obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
diff --git a/drivers/mfd/ds1374.c b/drivers/mfd/ds1374.c
new file mode 100644
index 000000000000..6e9041aba5d2
--- /dev/null
+++ b/drivers/mfd/ds1374.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Mamim/Dallas DS1374 MFD Core Driver.
+ *
+ * Copyright (C) 2020 Johnson Chen <johnsonch.chen@...a.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+
+
+static struct mfd_cell ds1374_cell[] = {
+ { .name = "ds1374_rtc", },
+ { .name = "ds1374_wdt", },
+};
+
+static int ds1374_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+
+ ret = i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BYTE);
+ if (!ret)
+ return -ENODEV;
+
+ ret = devm_mfd_add_devices(&client->dev, 0, ds1374_cell,
+ ARRAY_SIZE(ds1374_cell), NULL, 0, NULL);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to add DS1374 sub-devices\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ds1374_remove(struct i2c_client *client)
+{
+ mfd_remove_devices(&client->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ds1374_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (client->irq > 0 && device_may_wakeup(&client->dev))
+ enable_irq_wake(client->irq);
+ return 0;
+}
+
+static int ds1374_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (client->irq > 0 && device_may_wakeup(&client->dev))
+ disable_irq_wake(client->irq);
+ return 0;
+}
+#endif
+
+static const struct i2c_device_id ds1374_id[] = {
+ { "ds1374", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds1374_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ds1374_of_match[] = {
+ { .compatible = "dallas,ds1374" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ds1374_of_match);
+#endif
+
+static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
+
+static struct i2c_driver ds1374_driver = {
+ .driver = {
+ .name = "ds1374",
+ .of_match_table = of_match_ptr(ds1374_of_match),
+ .pm = &ds1374_pm,
+ },
+ .probe = ds1374_probe,
+ .remove = ds1374_remove,
+ .id_table = ds1374_id,
+};
+
+module_i2c_driver(ds1374_driver);
+
+MODULE_DESCRIPTION("Dallas/Maxim DS1374 MFD Core Driver");
+MODULE_AUTHOR("Johnson Chen <johnsonch.chen@...a.com>");
+MODULE_LICENSE("GPL");
--
2.20.1
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