On Tuesday 02 June 2015 01:10 PM, Lee Jones wrote:
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?
Currently not used, but it is for future use, where we would be
interested to know that the wakeup is really from reset or RTC wakeup.
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?
No, it is not.
Thanks,
Vaibhav
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