On Tue, 02 Jun 2015, Vaibhav Hiremath wrote:
> On Monday 01 June 2015 01:52 PM, Lee Jones wrote:
> >On Sat, 30 May 2015, Vaibhav Hiremath wrote:
> >
> >>RTC in pmic 88PM800 can run even the core is powered off, and user
> >>can set alarm in RTC. When the alarm is timed out, the PMIC will power up
> >>the core, and the whole system will boot up. And during PMIC driver probe,
> >>it will read some register to find out whether this boot is caused by RTC
> >>timeout or not, and pass on this information to the RTC driver.
> >>
> >>So we need rtc platform data to be existed in PMIC driver to pass this
> >>information.
> >>
> >>Signed-off-by: Chao Xie <chao.xie@xxxxxxxxxxx>
> >>Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@xxxxxxxxxx>
> >>---
> >> drivers/mfd/88pm800.c | 19 +++++++++++++++++++
> >> 1 file changed, 19 insertions(+)
> >>
> >>diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c
> >>index 8ea4467..34546a1 100644
> >>--- a/drivers/mfd/88pm800.c
> >>+++ b/drivers/mfd/88pm800.c
> >>@@ -586,6 +586,25 @@ static int pm800_probe(struct i2c_client *client,
> >> return ret;
> >> }
> >>
> >>+ /*
> >>+ * RTC in pmic can run even the core is powered off, and user can set
> >>+ * alarm in RTC. When the alarm is time out, the PMIC will power up
> >>+ * the core, and the whole system will boot up. When PMIC driver is
> >>+ * probed, it will read out some register to find out whether this
> >>+ * boot is caused by RTC timeout or not, and it need pass this
> >>+ * information to RTC driver.
> >>+ * So we need rtc platform data to be existed to pass this information.
> >>+ */
> >>+ if (!pdata->rtc) {
> >>+ pdata->rtc = devm_kzalloc(&client->dev,
> >>+ sizeof(*(pdata->rtc)), GFP_KERNEL);
> >>+ if (!pdata->rtc) {
> >>+ dev_err(&client->dev,
> >>+ "failed to allocate memory for rtc\n");
> >>+ return -ENOMEM;
> >>+ }
> >>+ }
> >>+
> >
> >Where is this memory first used?
> >
>
> In the same file, look for field "rtc_wakeup".
>
> FYI,
>
> This field is used in two files,
>
> drivers/mfd/88pm800.c
> and
> drivers/rtc/rtc-88pm800.c [sets the "platform_data" field]
Then were is the platform_data field subsequently used?
Looking at the RTC platform data declaration I see:
struct pm80x_rtc_pdata {
int vrtc;
int rtc_wakeup;
};
Is 'vrtc' even used? If so, where?
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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