Re: [rtc-linux] [PATCH 5/6] rtc: max77620: add support for max77620/max20024 RTC driver

Krzysztof Kozlowski
2016-01-08T02:03:15Z

2016-01-07 23:38 GMT+09:00 Laxman Dewangan <ldewangan@nvidia.com>:
> Maxim Semiconductor's PMIC MAX77620/MAX20024 has on chip
> RTC module. This support for setting alarm and time.
>
> Add RTC driver to access this chip's RTC module via RTC
> APIs.
>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> Signed-off-by: Chaitanya Bandi <bandik@nvidia.com>
> Tested-by: Venkat Reddy Talla <vreddytalla@nvidia.com>

Same as for mfd patch. The tag should be given explicitly in a public way.

> ---
> drivers/rtc/Kconfig | 9 +
> drivers/rtc/Makefile | 1 +
> drivers/rtc/rtc-max77620.c | 574 +++++++++++++++++++++++++++++++++++++++++++++

The driver (as most of Maxim's) looks quite similar to existing RTC
driver, like max77802. It is difficult to spot the exact differences
(I don't have 77620's datasheet) but I would suggest not duplicating
the work. Maybe the biggest difference is the way you configure the
regmap... but still sometimes the regmap config can be shared.

Anyway some minor comments below.

> 3 files changed, 584 insertions(+)
> create mode 100644 drivers/rtc/rtc-max77620.c
>
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 376322f..8723bf8 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -315,6 +315,15 @@ config RTC_DRV_MAX8997
> This driver can also be built as a module. If so, the module
> will be called rtc-max8997.
>
> +config RTC_DRV_MAX77620
> + tristate "Maxim MAX77620/MAX20024"
> + depends on MFD_MAX77620
> + help
> + If you say yes here you will get support for the
> + RTC of Maxim MAX77620/MAX20024 PMIC.
> + This driver can also be built as a module. If so, the module
> + will be called rtc-max77620.
> +
> config RTC_DRV_MAX77686
> tristate "Maxim MAX77686"
> depends on MFD_MAX77686
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 62d61b2..da5db0a 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -85,6 +85,7 @@ obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
> obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
> obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
> obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
> +obj-$(CONFIG_RTC_DRV_MAX77620) += rtc-max77620.o
> obj-$(CONFIG_RTC_DRV_MAX77686) += rtc-max77686.o
> obj-$(CONFIG_RTC_DRV_MAX77802) += rtc-max77802.o
> obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o
> diff --git a/drivers/rtc/rtc-max77620.c b/drivers/rtc/rtc-max77620.c
> new file mode 100644
> index 0000000..645c661
> --- /dev/null
> +++ b/drivers/rtc/rtc-max77620.c
> @@ -0,0 +1,574 @@
> +/*
> + * Max77620 RTC driver
> + *
> + * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/rtc.h>
> +#include <linux/mfd/max77620.h>
> +
> +#define MAX77620_RTC60S_MASK BIT(0)
> +#define MAX77620_RTCA1_MASK BIT(1)
> +#define MAX77620_RTCA2_MASK BIT(2)
> +#define MAX77620_RTC_SMPL_MASK BIT(3)
> +#define MAX77620_RTC_RTC1S_MASK BIT(4)
> +#define MAX77620_RTC_ALL_IRQ_MASK 0x1F
> +
> +#define MAX77620_BCDM_MASK BIT(0)
> +#define MAX77620_HRMODEM_MASK BIT(1)
> +
> +#define WB_UPDATE_MASK BIT(0)
> +#define FLAG_AUTO_CLEAR_MASK BIT(1)
> +#define FREEZE_SEC_MASK BIT(2)
> +#define RTC_WAKE_MASK BIT(3)
> +#define RB_UPDATE_MASK BIT(4)
> +
> +#define MAX77620_UDF_MASK BIT(0)
> +#define MAX77620_RBUDF_MASK BIT(1)
> +
> +#define SEC_MASK 0x7F
> +#define MIN_MASK 0x7F
> +#define HOUR_MASK 0x3F
> +#define WEEKDAY_MASK 0x7F
> +#define MONTH_MASK 0x1F
> +#define YEAR_MASK 0xFF
> +#define MONTHDAY_MASK 0x3F
> +
> +#define ALARM_EN_MASK 0x80
> +#define ALARM_EN_SHIFT 7
> +
> +#define RTC_YEAR_BASE 100
> +#define RTC_YEAR_MAX 99
> +
> +#define ONOFF_WK_ALARM1_MASK BIT(2)
> +
> +enum {
> + RTC_SEC,
> + RTC_MIN,
> + RTC_HOUR,
> + RTC_WEEKDAY,
> + RTC_MONTH,
> + RTC_YEAR,
> + RTC_MONTHDAY,
> + RTC_NR
> +};
> +
> +struct max77620_rtc {
> + struct rtc_device *rtc;
> + struct device *dev;
> +
> + struct mutex io_lock;
> + int irq;
> + u8 irq_mask;
> +};
> +
> +static inline struct device *_to_parent(struct max77620_rtc *rtc)

max77620_to_parent().

> +{
> + return rtc->dev->parent;
> +}
> +
> +static inline int max77620_rtc_update_buffer(struct max77620_rtc *rtc,
> + int write)

What's the purpose of declaring it inline?

> +{
> + struct device *parent = _to_parent(rtc);
> + u8 val = FLAG_AUTO_CLEAR_MASK | RTC_WAKE_MASK;
> + int ret;
> +
> + if (write)
> + val |= WB_UPDATE_MASK;
> + else
> + val |= RB_UPDATE_MASK;
> +
> + dev_dbg(rtc->dev, "rtc_update_buffer: write=%d, addr=0x%x, val=0x%x\n",
> + write, MAX77620_REG_RTCUPDATE0, val);
> + ret = max77620_reg_write(parent, MAX77620_RTC_SLAVE,
> + MAX77620_REG_RTCUPDATE0, val);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg RTCUPDATE0 read failed: %d\n", ret);
> + return ret;
> + }
> +
> + /* Must wait 16ms for buffer update */
> + usleep_range(16000, 17000);
> +
> + return 0;
> +}
> +
> +static inline int max77620_rtc_write(struct max77620_rtc *rtc, u8 addr,
> + void *values, u32 len, int update_buffer)

It seems you are using 0 or 1 for update_buffer. So bool.

> +{
> + struct device *parent = _to_parent(rtc);
> + int ret;
> +
> + mutex_lock(&rtc->io_lock);
> +
> + ret = max77620_reg_writes(parent, MAX77620_RTC_SLAVE,
> + addr, len, values);
> + if (ret < 0)
> + goto out;
> +
> + if (update_buffer)
> + ret = max77620_rtc_update_buffer(rtc, 1);
> +
> +out:
> + mutex_unlock(&rtc->io_lock);

New line, here and in other places.

> + return ret;
> +}
> +
> +static inline int max77620_rtc_read(struct max77620_rtc *rtc, u8 addr,
> + void *values, u32 len, int update_buffer)
> +{
> + struct device *parent = _to_parent(rtc);
> + int ret;
> +
> + mutex_lock(&rtc->io_lock);
> +
> + if (update_buffer) {
> + ret = max77620_rtc_update_buffer(rtc, 0);
> + if (ret < 0)
> + goto out;
> + }
> +
> + ret = max77620_reg_reads(parent, MAX77620_RTC_SLAVE, addr, len, values);
> +out:
> + mutex_unlock(&rtc->io_lock);
> + return ret;
> +}
> +
> +static inline int max77620_rtc_reg_to_tm(struct max77620_rtc *rtc, u8 *buf,
> + struct rtc_time *tm)
> +{
> + int wday = buf[RTC_WEEKDAY] & WEEKDAY_MASK;
> +
> + if (unlikely(!wday)) {
> + dev_err(rtc->dev,
> + "rtc_reg_to_tm: Invalid day of week, %d\n", wday);
> + return -EINVAL;
> + }
> +
> + tm->tm_sec = (int)(buf[RTC_SEC] & SEC_MASK);
> + tm->tm_min = (int)(buf[RTC_MIN] & MIN_MASK);
> + tm->tm_hour = (int)(buf[RTC_HOUR] & HOUR_MASK);
> + tm->tm_mday = (int)(buf[RTC_MONTHDAY] & MONTHDAY_MASK);
> + tm->tm_mon = (int)(buf[RTC_MONTH] & MONTH_MASK) - 1;
> + tm->tm_year = (int)(buf[RTC_YEAR] & YEAR_MASK) + RTC_YEAR_BASE;
> + tm->tm_wday = ffs(wday) - 1;
> +
> + return 0;
> +}
> +
> +static inline int max77620_rtc_tm_to_reg(struct max77620_rtc *rtc, u8 *buf,
> + struct rtc_time *tm, int alarm)
> +{
> + u8 alarm_mask = alarm ? ALARM_EN_MASK : 0;
> +
> + if (unlikely((tm->tm_year < RTC_YEAR_BASE) ||
> + (tm->tm_year > RTC_YEAR_BASE + RTC_YEAR_MAX))) {
> + dev_err(rtc->dev,
> + "rtc_tm_to_reg: Invalid year, %d\n", tm->tm_year);
> + return -EINVAL;
> + }
> +
> + buf[RTC_SEC] = tm->tm_sec | alarm_mask;
> + buf[RTC_MIN] = tm->tm_min | alarm_mask;
> + buf[RTC_HOUR] = tm->tm_hour | alarm_mask;
> + buf[RTC_MONTHDAY] = tm->tm_mday | alarm_mask;
> + buf[RTC_MONTH] = (tm->tm_mon + 1) | alarm_mask;
> + buf[RTC_YEAR] = (tm->tm_year - RTC_YEAR_BASE) | alarm_mask;
> +
> + /* The wday is configured only when disabled alarm. */
> + if (!alarm)
> + buf[RTC_WEEKDAY] = (1 << tm->tm_wday);
> + else {
> + /* Configure its default reset value 0x01, and not enable it. */
> + buf[RTC_WEEKDAY] = 0x01;
> + }
> + return 0;
> +}
> +
> +static inline int max77620_rtc_irq_mask(struct max77620_rtc *rtc, u8 irq)
> +{
> + u8 irq_mask = rtc->irq_mask | irq;
> + int ret = 0;
> +
> + ret = max77620_rtc_write(rtc, MAX77620_REG_RTCINTM, &irq_mask, 1, 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "rtc_irq_mask: Failed to set rtc irq mask\n");

Again a chain of error messages for the same error. The error comes
either from max77620_reg_writes() or from
max77620_rtc_update_buffer(). Then you print it here as well polluting
the dmesg.

> + goto out;
> + }
> + rtc->irq_mask = irq_mask;
> +
> +out:
> + return ret;
> +}
> +
> +static inline int max77620_rtc_irq_unmask(struct max77620_rtc *rtc, u8 irq)
> +{
> + u8 irq_mask = rtc->irq_mask & ~irq;
> + int ret = 0;
> +
> + ret = max77620_rtc_write(rtc, MAX77620_REG_RTCINTM, &irq_mask, 1, 1);
> + if (ret < 0) {
> + dev_err(rtc->dev,
> + "rtc_irq_unmask: Failed to set rtc irq mask\n");
> + goto out;
> + }
> + rtc->irq_mask = irq_mask;
> +
> +out:
> + return ret;
> +}
> +
> +static inline int max77620_rtc_do_irq(struct max77620_rtc *rtc)
> +{
> + struct device *parent = _to_parent(rtc);
> + u8 irq_status;
> + int ret;
> +
> + ret = max77620_reg_read(parent, MAX77620_RTC_SLAVE,
> + MAX77620_REG_RTCINT, &irq_status);
> + if (ret < 0) {
> + dev_err(rtc->dev, "rtc_irq: Failed to get rtc irq status\n");
> + return ret;
> + }
> +
> + dev_dbg(rtc->dev, "rtc_do_irq: irq_mask=0x%02x, irq_status=0x%02x\n",
> + rtc->irq_mask, irq_status);
> +
> + if (!(rtc->irq_mask & MAX77620_RTCA1_MASK) &&
> + (irq_status & MAX77620_RTCA1_MASK))
> + rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
> +
> + if (!(rtc->irq_mask & MAX77620_RTC_RTC1S_MASK) &&
> + (irq_status & MAX77620_RTC_RTC1S_MASK))
> + rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
> +
> + return ret;
> +}
> +
> +static irqreturn_t max77620_rtc_irq(int irq, void *data)
> +{
> + struct max77620_rtc *rtc = (struct max77620_rtc *)data;
> +
> + max77620_rtc_do_irq(rtc);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int max77620_rtc_alarm_irq_enable(struct device *dev,
> + unsigned int enabled)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(dev);
> + int ret = 0;
> +
> + if (rtc->irq < 0)
> + return -ENXIO;
> +
> + /* Handle pending interrupt */
> + ret = max77620_rtc_do_irq(rtc);
> + if (ret < 0)
> + goto out;
> +
> + /* Config alarm interrupt */

s/Config/Configure/ ?

> + if (enabled) {
> + ret = max77620_rtc_irq_unmask(rtc, MAX77620_RTCA1_MASK);
> + if (ret < 0)
> + goto out;
> + } else {
> + ret = max77620_rtc_irq_mask(rtc, MAX77620_RTCA1_MASK);
> + if (ret < 0)
> + goto out;
> + }
> +out:
> + return ret;
> +}
> +
> +static int max77620_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(dev);
> + u8 buf[RTC_NR];
> + int ret;
> +
> + ret = max77620_rtc_read(rtc, MAX77620_REG_RTCSEC, buf, sizeof(buf), 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg RTCSEC read failed: %d\n", ret);
> + return ret;
> + }
> +
> + ret = max77620_rtc_reg_to_tm(rtc, buf, tm);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg format to time format conv failed: %d\n",
> + ret);

The same pattern of error messages - max77620_rtc_reg_to_tm() will
print it. Show it only once.

> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static int max77620_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(dev);
> + u8 buf[RTC_NR];
> + int ret;
> +
> + ret = max77620_rtc_tm_to_reg(rtc, buf, tm, 0);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Time format to Reg format conv failed: %d\n",
> + ret);
> + return ret;
> + }
> +
> + return max77620_rtc_write(rtc, MAX77620_REG_RTCSEC,
> + buf, sizeof(buf), 1);
> +}
> +
> +static int max77620_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(dev);
> + u8 buf[RTC_NR];
> + int ret;
> +
> + ret = max77620_rtc_read(rtc, MAX77620_REG_RTCSECA1,
> + buf, sizeof(buf), 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg RTCSECA1 read failed: %d\n", ret);
> + return ret;
> + }
> +

One line is enough.

> +
> + buf[RTC_YEAR] &= ~ALARM_EN_MASK;
> + ret = max77620_rtc_reg_to_tm(rtc, buf, &alrm->time);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg format to time format conv failed: %d\n",
> + ret);
> + return ret;
> + }
> +
> + if (rtc->irq_mask & MAX77620_RTCA1_MASK)
> + alrm->enabled = 0;
> + else
> + alrm->enabled = 1;
> +
> + return 0;
> +}
> +
> +static int max77620_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(dev);
> + u8 buf[RTC_NR];
> + int ret;
> +
> + ret = max77620_rtc_tm_to_reg(rtc, buf, &alrm->time, 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Time format to reg format conv failed: %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = max77620_rtc_write(rtc, MAX77620_REG_RTCSECA1, buf,
> + sizeof(buf), 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Reg RTCSECA1 write failed: %d\n", ret);
> + return ret;
> + }
> +
> + ret = max77620_rtc_alarm_irq_enable(dev, alrm->enabled);
> + if (ret < 0) {
> + dev_err(rtc->dev, "Enable rtc alarm failed: %d\n", ret);
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static const struct rtc_class_ops max77620_rtc_ops = {
> + .read_time = max77620_rtc_read_time,
> + .set_time = max77620_rtc_set_time,
> + .read_alarm = max77620_rtc_read_alarm,
> + .set_alarm = max77620_rtc_set_alarm,
> + .alarm_irq_enable = max77620_rtc_alarm_irq_enable,
> +};
> +
> +static int max77620_rtc_preinit(struct max77620_rtc *rtc)
> +{
> + struct device *parent = _to_parent(rtc);
> + u8 val;
> + int ret;
> +
> + /* Mask all interrupts */
> + rtc->irq_mask = 0xFF;
> + ret = max77620_rtc_write(rtc, MAX77620_REG_RTCINTM,
> + &rtc->irq_mask, 1, 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "preinit: Failed to set rtc irq mask\n");
> + return ret;
> + }
> +
> + max77620_rtc_read(rtc, MAX77620_REG_RTCINT, &val, 1, 0);
> +
> + /* Configure Binary mode and 24hour mode */
> + val = MAX77620_HRMODEM_MASK;
> + ret = max77620_rtc_write(rtc, MAX77620_REG_RTCCNTL, &val, 1, 1);
> + if (ret < 0) {
> + dev_err(rtc->dev, "preinit: Failed to set rtc control\n");
> + return ret;
> + }
> +
> + /* It should be disabled alarm wakeup to wakeup from sleep
> + * by EN1 input signal.
> + */

Please use Linux coding style for multi-line comments. I also can't
get the meaning. It should be disabled wakeup to wakeup?

> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + MAX77620_REG_ONOFFCNFG2, ONOFF_WK_ALARM1_MASK, 0);
> + if (ret < 0) {
> + dev_err(rtc->dev, "preinit: Failed to set onoff cfg2\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int max77620_rtc_probe(struct platform_device *pdev)
> +{
> + static struct max77620_rtc *rtc;
> + int ret = 0;
> +
> + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
> + if (!rtc)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&pdev->dev, rtc);
> + rtc->dev = &pdev->dev;
> + mutex_init(&rtc->io_lock);
> +
> + ret = max77620_rtc_preinit(rtc);
> + if (ret) {
> + dev_err(&pdev->dev, "probe: Failed to rtc preinit\n");
> + goto fail_preinit;
> + }
> +
> + device_init_wakeup(&pdev->dev, 1);
> +
> + rtc->rtc = devm_rtc_device_register(&pdev->dev, "max77620-rtc",
> + &max77620_rtc_ops, THIS_MODULE);
> + if (IS_ERR(rtc->rtc)) {
> + dev_err(&pdev->dev, "probe: Failed to register rtc\n");
> + ret = PTR_ERR(rtc->rtc);
> + goto fail_preinit;
> + }
> +
> + rtc->irq = platform_get_irq(pdev, 0);
> + ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
> + max77620_rtc_irq, IRQF_ONESHOT | IRQF_EARLY_RESUME,

Why early resume?

> + "max77620-rtc", rtc);
> + if (ret < 0) {
> + dev_err(rtc->dev, "probe: Failed to request irq %d\n",
> + rtc->irq);
> + rtc->irq = -1;

Why? The probe will fail. Will it be used somewhere?

> + goto fail_preinit;
> + }
> +
> + device_init_wakeup(rtc->dev, 1);

This shouldn't be needed.

> + enable_irq_wake(rtc->irq);
> +
> + return 0;
> +
> +fail_preinit:
> + mutex_destroy(&rtc->io_lock);
> + return ret;
> +}
> +
> +static int max77620_rtc_remove(struct platform_device *pdev)
> +{
> + struct max77620_rtc *rtc = dev_get_drvdata(&pdev->dev);
> +
> + mutex_destroy(&rtc->io_lock);
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int max77620_rtc_suspend(struct device *dev)
> +{
> + struct max77620_rtc *max77620_rtc = dev_get_drvdata(dev);
> +
> + if (device_may_wakeup(dev)) {
> + int ret;
> + struct rtc_wkalrm alm;
> +
> + enable_irq_wake(max77620_rtc->irq);
> + ret = max77620_rtc_read_alarm(dev, &alm);
> + if (!ret)
> + dev_info(dev, "%s() alrm %d time %d %d %d %d %d %d\n",
> + __func__, alm.enabled,
> + alm.time.tm_year, alm.time.tm_mon,
> + alm.time.tm_mday, alm.time.tm_hour,
> + alm.time.tm_min, alm.time.tm_sec);

Nope. On each suspend you want to print current time? This does not
even classifies for dev_dbg.

> + }
> +
> + return 0;
> +}
> +
> +static int max77620_rtc_resume(struct device *dev)
> +{
> + struct max77620_rtc *max77620_rtc = dev_get_drvdata(dev);
> +
> + if (device_may_wakeup(dev)) {
> + struct rtc_time tm;
> + int ret;
> +
> + disable_irq_wake(max77620_rtc->irq);
> + ret = max77620_rtc_read_time(dev, &tm);
> + if (!ret)
> + dev_info(dev, "%s() %d %d %d %d %d %d\n",
> + __func__, tm.tm_year, tm.tm_mon, tm.tm_mday,
> + tm.tm_hour, tm.tm_min, tm.tm_sec);

Ditto.

> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops max77620_rtc_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(max77620_rtc_suspend, max77620_rtc_resume)
> +};
> +
> +static struct platform_device_id max77620_rtc_devtype[] = {

const?

Best regards,
Krzysztof

> + {
> + .name = "max77620-rtc",
> + },
> + {
> + .name = "max20024-rtc",
> + },
> +};
> +
> +static struct platform_driver max77620_rtc_driver = {
> + .probe = max77620_rtc_probe,
> + .remove = max77620_rtc_remove,
> + .id_table = max77620_rtc_devtype,
> + .driver = {
> + .name = "max77620-rtc",
> + .owner = THIS_MODULE,
> + .pm = &max77620_rtc_pm_ops,
> + },
> +};
> +
> +module_platform_driver(max77620_rtc_driver);
> +
> +MODULE_DESCRIPTION("max77620 RTC driver");
> +MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
> +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
> +MODULE_ALIAS("platform:max77620-rtc");
> +MODULE_LICENSE("GPL v2");
> --
> 2.1.4
>
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