Messages in this thread | | | Date | Tue, 02 Jun 2015 14:35:58 +0530 | From | Vaibhav Hiremath <> | Subject | Re: [PATCH 4/4] mfd: 88pm800: allocate pdata->rtc if not allocated earlier |
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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@marvell.com> >>>> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> >>>> --- >>>> 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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