Re: [PATCH v5 3/5] RTC: RK808: add RTC driver for RK808

From: Doug Anderson
Date: Mon Aug 25 2014 - 23:23:03 EST

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Chris,

On Mon, Aug 25, 2014 at 6:34 AM, Chris Zhong <zyw@xxxxxxxxxxxxxx> wrote:
> Adding RTC driver for supporting RTC device present inside RK808 PMIC.
>
> Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>

Add Signed-off-by: Zhang Qing <zhangqing@xxxxxxxxxxxxxx>

> ---
>
> Changes in v5:
> - fixed a bug about set_time failed
>
> Changes in v4:
> - use &client->dev replace rk808->dev
>
> Changes in v3: None
> Changes in v2:
> Adviced by javier.martinez
> - Add a separate clock driver, rather than in RTC driver
>
> drivers/rtc/Kconfig | 11 ++
> drivers/rtc/Makefile | 1 +
> drivers/rtc/rtc-rk808.c | 442 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 454 insertions(+)
> create mode 100644 drivers/rtc/rtc-rk808.c
>
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index a168e96..48f61b2 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -288,6 +288,17 @@ config RTC_DRV_MAX77686
> This driver can also be built as a module. If so, the module
> will be called rtc-max77686.
>
> +config RTC_DRV_RK808
> + tristate "Rockchip RK808 RTC"
> + depends on MFD_RK808
> + help
> + If you say yes here you will get support for the
> + RTC of Rk808 PMIC.

Capitalization. RK808.

> +
> + This driver can also be built as a module. If so, the module
> + will be called rtc-rk808.

Have you tried that? From the code I'd guess "rk808-rtc", not "rtc-rk808".

> config RTC_DRV_RS5C372
> tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
> help
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 56f061c..91fe4647 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -109,6 +109,7 @@ obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o
> obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
> obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
> obj-$(CONFIG_RTC_DRV_RC5T583) += rtc-rc5t583.o
> +obj-$(CONFIG_RTC_DRV_RK808) += rtc-rk808.o
> obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o
> obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
> obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
> diff --git a/drivers/rtc/rtc-rk808.c b/drivers/rtc/rtc-rk808.c
> new file mode 100644
> index 0000000..b5f0df5
> --- /dev/null
> +++ b/drivers/rtc/rtc-rk808.c
> @@ -0,0 +1,442 @@
> +/*
> + * RTC driver for Rockchip RK808
> + *
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * Author: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> + * Author: Zhang Qing <zhangqing@xxxxxxxxxxxxxx>

Author is already below (see MODULE_AUTHOR). No need to repeat.

> + *
> + * 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.
> + *

In a different patch I think Lee wanted the extra blank "*" line gone.

> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/rtc.h>
> +#include <linux/bcd.h>
> +#include <linux/mfd/rk808.h>
> +#include <linux/platform_device.h>
> +#include <linux/i2c.h>
> +
> +/* RTC_CTRL_REG bitfields */
> +#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0)
> +#define BIT_RTC_CTRL_REG_RTC_V_OPT_M BIT(7)
> +#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3)
> +
> +#define SECONDS_REG_MSK 0x7F
> +#define MINUTES_REG_MAK 0x7F
> +#define HOURS_REG_MSK 0x3F
> +#define DAYS_REG_MSK 0x3F
> +#define MONTHS_REG_MSK 0x1F
> +#define YEARS_REG_MSK 0xFF
> +#define WEEKS_REG_MSK 0x7
> +
> +/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
> +
> +#define ALL_TIME_REGS 7

Change this to (RK808_WEEKS_REG - RK808_SECONDS_REG + 1)

...and probably call it NUM_TIME_REGS

> +#define ALL_ALM_REGS 6

Change this to (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)

...and call it NUM_ALARM_REGS

> +
> +struct rk808_rtc {
> + struct rk808 *rk808;
> + struct rtc_device *rtc;
> + unsigned int alarm_enabled:1;
> +};
> +
> +/*
> + * Read current time and date in RTC
> + */
> +static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm)
> +{
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + unsigned char rtc_data[ALL_TIME_REGS];

nit: u8, not "unsigned char"

> + int ret;
> +
> + /* Has the RTC been programmed? */
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
> + BIT_RTC_CTRL_REG_RTC_V_OPT_M, 0);

Can you explain what you're doing here? The comment seems wrong since
it implies that you're checking something.

>From what I can tell from the manual you're setting "RTC_READSEL" to 0
which means "Read access directly to dynamic registers.". That's not
clear here, and RTC_V_OPT_M makes no sense to me.

> + if (ret) {
> + dev_err(dev, "Failed to update RTC control: %d\n", ret);
> + return ret;
> + }
> +
> + ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG,
> + rtc_data, ALL_TIME_REGS);
> + if (ret) {
> + dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
> + return ret;
> + }
> +
> + tm->tm_sec = bcd2bin(rtc_data[0]) & SECONDS_REG_MSK;

Shouldn't this and the others be:

tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);

not:

tm->tm_sec = bcd2bin(rtc_data[0]) & SECONDS_REG_MSK;

In other words: apply the mask before passing to bcd2bin(). Same
everywhere in this patch.

> + tm->tm_min = bcd2bin(rtc_data[1]) & MINUTES_REG_MAK;
> + tm->tm_hour = bcd2bin(rtc_data[2]) & HOURS_REG_MSK;
> + tm->tm_mday = bcd2bin(rtc_data[3]) & DAYS_REG_MSK;
> + tm->tm_mon = (bcd2bin(rtc_data[4]) & MONTHS_REG_MSK) - 1;
> + tm->tm_year = (bcd2bin(rtc_data[5]) & YEARS_REG_MSK) + 100;
> + tm->tm_wday = bcd2bin(rtc_data[6]) & WEEKS_REG_MSK;
> + dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
> + 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
> + tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);
> +
> + return 0;
> +}
> +
> +/*
> + * Set current time and date in RTC
> + */
> +static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm)

Make this "const struct rtc_time *tm"

> +{
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + unsigned char rtc_data[ALL_TIME_REGS + 1];

Why + 1?

nit: u8, not "unsigned char"

> + int ret;
> +
> + rtc_data[0] = bin2bcd(tm->tm_sec);
> + rtc_data[1] = bin2bcd(tm->tm_min);
> + rtc_data[2] = bin2bcd(tm->tm_hour);
> + rtc_data[3] = bin2bcd(tm->tm_mday);
> + rtc_data[4] = bin2bcd(tm->tm_mon + 1);
> + rtc_data[5] = bin2bcd(tm->tm_year - 100);
> + rtc_data[6] = bin2bcd(tm->tm_wday);
> + dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
> + 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
> + tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);
> +
> + /* Stop RTC while updating the RTC registers */
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
> + BIT_RTC_CTRL_REG_STOP_RTC_M,
> + BIT_RTC_CTRL_REG_STOP_RTC_M);
> + if (ret) {
> + dev_err(dev, "Failed to update RTC control: %d\n", ret);
> + return ret;
> + }
> +
> + ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG,
> + rtc_data, ALL_TIME_REGS);
> + if (ret) {
> + dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
> + return ret;
> + }
> + /* Start RTC again */
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
> + BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
> + if (ret) {
> + dev_err(dev, "Failed to update RTC control: %d\n", ret);
> + return ret;
> + }
> + return 0;
> +}
> +
> +/*
> + * Read alarm time and date in RTC
> + */
> +static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + unsigned char alrm_data[ALL_ALM_REGS];
> + uint32_t int_reg;
> + int ret;
> +
> + ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG,
> + alrm_data, ALL_ALM_REGS);
> +
> + /* some of these fields may be wildcard/"match all" */
> + alrm->time.tm_sec = bcd2bin(alrm_data[0]) & SECONDS_REG_MSK;
> + alrm->time.tm_min = bcd2bin(alrm_data[1]) & MINUTES_REG_MAK;
> + alrm->time.tm_hour = bcd2bin(alrm_data[2]) & HOURS_REG_MSK;
> + alrm->time.tm_mday = bcd2bin(alrm_data[3]) & DAYS_REG_MSK;
> + alrm->time.tm_mon = (bcd2bin(alrm_data[4]) & MONTHS_REG_MSK) - 1;
> + alrm->time.tm_year = (bcd2bin(alrm_data[5]) & YEARS_REG_MSK) + 100;
> +
> + ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg);
> + if (ret) {
> + dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
> + return ret;
> + }
> +
> + dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
> + 1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
> + alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
> + alrm->time.tm_min, alrm->time.tm_sec);
> +
> + alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;
> +
> + return 0;
> +}
> +
> +static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
> +{
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + int ret;
> +
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
> + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);
> + if (!ret)
> + rk808_rtc->alarm_enabled = 0;
> +
> + return ret;
> +}
> +
> +static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
> +{
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + int ret;
> +
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
> + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
> + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
> + if (!ret)
> + rk808_rtc->alarm_enabled = 1;
> +
> + return ret;
> +}
> +
> +static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + unsigned char alrm_data[ALL_TIME_REGS];
> + int ret;
> +
> + ret = rk808_rtc_stop_alarm(rk808_rtc);
> + if (ret) {
> + dev_err(dev, "Failed to stop alarm: %d\n", ret);
> + return ret;
> + }
> + dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
> + 1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
> + alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
> + alrm->time.tm_min, alrm->time.tm_sec);
> +
> + alrm_data[0] = bin2bcd(alrm->time.tm_sec);
> + alrm_data[1] = bin2bcd(alrm->time.tm_min);
> + alrm_data[2] = bin2bcd(alrm->time.tm_hour);
> + alrm_data[3] = bin2bcd(alrm->time.tm_mday);
> + alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
> + alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);
> +
> + ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG,
> + alrm_data, ALL_ALM_REGS);
> + if (ret) {
> + dev_err(dev, "Failed to bulk write: %d\n", ret);
> + return ret;
> + }
> + if (alrm->enabled) {
> + ret = rk808_rtc_start_alarm(rk808_rtc);
> + if (ret) {
> + dev_err(dev, "Failed to start alarm: %d\n", ret);
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +static int rk808_rtc_alarm_irq_enable(struct device *dev,
> + unsigned int enabled)
> +{
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
> +
> + if (enabled)
> + return rk808_rtc_start_alarm(rk808_rtc);
> +
> + return rk808_rtc_stop_alarm(rk808_rtc);
> +}
> +
> +/*
> + * We will just handle setting the frequency and make use the framework for
> + * reading the periodic interupts.
> + *
> + * @freq: Current periodic IRQ freq:
> + * bit 0: every second
> + * bit 1: every minute
> + * bit 2: every hour
> + * bit 3: every day
> + */
> +static irqreturn_t rk808_alm_irq(int irq, void *data)
> +{
> + struct rk808_rtc *rk808_rtc = data;
> + struct rk808 *rk808 = rk808_rtc->rk808;
> + struct i2c_client *client = rk808->i2c;
> + uint32_t rtc_ctl;
> + int ret;
> +
> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_STATUS_REG,
> + 0, 0);

This seems bad. You're saying to write nothing and relying on regmap
to happen to read / write the register. Why not just write 0xfe (all
the bits?)

> + if (ret) {
> + dev_err(&client->dev,
> + "%s:Failed to update RTC status: %d\n", __func__, ret);
> + return ret;
> + }
> +
> + rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF | RTC_AF);
> + dev_info(&client->dev,
> + "%s:irq=%d,rtc_ctl=0x%x\n", __func__, irq, rtc_ctl);

Really, a printout on every IRQ?

> + return IRQ_HANDLED;
> +}
> +
> +static const struct rtc_class_ops rk808_rtc_ops = {
> + .read_time = rk808_rtc_readtime,
> + .set_time = rk808_rtc_set_time,
> + .read_alarm = rk808_rtc_readalarm,
> + .set_alarm = rk808_rtc_setalarm,
> + .alarm_irq_enable = rk808_rtc_alarm_irq_enable,
> +};
> +
> +#ifdef CONFIG_PM
> +/* Turn off the alarm if it should not be a wake source. */
> +static int rk808_rtc_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
> + int ret;
> +
> + if (rk808_rtc->alarm_enabled && device_may_wakeup(&pdev->dev))
> + ret = rk808_rtc_start_alarm(rk808_rtc);
> + else
> + ret = rk808_rtc_stop_alarm(rk808_rtc);

What are you trying to do here? Why do you need to start or stop the
alarm at suspend time? Just let the system mask off your IRQ. I
think you can remove that whole block, right? Then you can remove the
"alarm_enabled" global? ...or am I missing something?

Also, do you need to do:

if (device_may_wakeup(dev)) {
enable_irq_wake(irq);

? That's a common pattern that I see in drivers.

> + if (ret)
> + dev_err(&pdev->dev, "Failed to update RTC alarm: %d\n", ret);
> +
> + return ret;
> +}
> +
> +/* Enable the alarm if it should be enabled (in case it was disabled to
> + * prevent use as a wake source).
> + */
> +static int rk808_rtc_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
> + int ret;

Don't you need to init "ret" to 0? Otherwise you'll return an
uninitialized value if the alarm isn't enabled.

> +
> + if (rk808_rtc->alarm_enabled) {
> + ret = rk808_rtc_start_alarm(rk808_rtc);
> + if (ret)
> + dev_err(&pdev->dev,
> + "Failed to restart RTC alarm: %d\n", ret);
> + }
> +
> + return ret;
> +}
> +#else
> +#define rk808_rtc_suspend NULL
> +#define rk808_rtc_resume NULL
> +#endif
> +
> +static const struct dev_pm_ops rk808_rtc_pm_ops = {
> + .suspend = rk808_rtc_suspend,
> + .resume = rk808_rtc_resume,
> + .poweroff = rk808_rtc_suspend,

Have you tested suspend/resume, or is all of this suspend/resume code
just a guess?

> +};
> +
> +/*2012.1.1 12:00:00 Saturday*/
> +struct rtc_time tm_def = {
> + .tm_wday = 6,
> + .tm_year = 112,
> + .tm_mon = 0,
> + .tm_mday = 1,
> + .tm_hour = 12,
> + .tm_min = 0,
> + .tm_sec = 0,
> +};

Make this struct "const".

Seems like an odd default time, but OK. Why not 2014 so we're at least closer?

> +
> +static int rk808_rtc_probe(struct platform_device *pdev)
> +{
> + struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
> + struct i2c_client *client = rk808->i2c;
> + struct rk808_rtc *rk808_rtc;
> + struct rtc_time tm;
> + int alm_irq;
> + int ret;
> +
> + rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
> + if (rk808_rtc == NULL)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, rk808_rtc);
> + rk808_rtc->rk808 = rk808;
> +
> + /* start rtc default */

"start rtc running by default"

> + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
> + BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "Failed to read RTC control: %d\n", ret);

Failed to "update" RTC control.

> + return ret;
> + }
> +
> + ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG, 0xfe);

Worth a #define for 0xfe?

> + if (ret) {
> + dev_err(&pdev->dev,
> + "Failed to write RTC control: %d\n", ret);

You're not writing the RTC control, you're writing the RTC status, so
adjust error message.

> + return ret;
> + }
> +
> + /* set init time */
> + ret = rk808_rtc_readtime(&pdev->dev, &tm);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to read RTC time\n");
> + return ret;
> + }
> + ret = rtc_valid_tm(&tm);
> + if (ret) {
> + dev_err(&pdev->dev, "invalid date/time and init time\n");

Doesn't seem worthy of dev_err. Why not dev_warn?

> + rk808_rtc_set_time(&pdev->dev, &tm_def);
> + }
> +
> + device_init_wakeup(&pdev->dev, 1);

You can skip this. We'll set "wakeup-source" in the device tree.
That will set I2C_CLIENT_WAKE. That will cause the i2c core to call
device_init_wakeup() for you.

> + rk808_rtc->rtc = devm_rtc_device_register(&pdev->dev,
> + "rk808", &rk808_rtc_ops, THIS_MODULE);

Name "rk808-rtc" maybe? That seems to match other MFDs

> + if (IS_ERR(rk808_rtc->rtc)) {
> + ret = PTR_ERR(rk808_rtc->rtc);
> + return ret;
> + }
> +
> + alm_irq = platform_get_irq(pdev, 0);

Are you sure that platform_get_irq() works in this case? In Javier's
in-flight max77802 driver he use regmap_irq_get_virq().

...oh, maybe your way does work! You've got the rtc_resources to
specify things, so that looks good...

...but I tried testing it by doing:

cd /sys/class/rtc/rtc0
echo +2 > wakealarm
sleep 5
grep 808 /proc/interrupts

...and I didn't see an interrupt go off. Any idea why?

> + if (alm_irq <= 0) {
> + dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
> + alm_irq);
> + return -ENXIO;

Why not return alm_irq? Isn't that the error?

> + }
> +
> + /* request alarm irq of rk808 */
> + ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
> + rk808_alm_irq,
> + IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME,
> + "RTC alarm", rk808_rtc);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
> + alm_irq, ret);
> + }
> + device_set_wakeup_capable(&pdev->dev, 1);

Remove device_set_wakeup_capable(). It's called as part of
device_init_wakeup().

> +
> + dev_info(&client->dev, "%s:ok\n", __func__);

This "dev_info" doesn't add anything. Remove.

> +
> + return ret;
> +}
> +
> +static struct platform_driver rk808_rtc_driver = {
> + .probe = rk808_rtc_probe,
> + .driver = {
> + .name = "rk808-rtc",
> + .pm = &rk808_rtc_pm_ops,
> + },
> +};
> +
> +module_platform_driver(rk808_rtc_driver);
> +
> +MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
> +MODULE_AUTHOR("Chris Zhong <zyw@xxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Zhang Qing <zhanqging@xxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:rk808-rtc");

I haven't looked over every last thing, but hopefully the above looks
reasonable. I'm nowhere near an RTC expert so please yell if you
think one of my comments is incorrect.

-Doug
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