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SubjectRe: [PATCH 4/4] mfd: 88pm800: allocate pdata->rtc if not allocated earlier


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]


Thanks,
Vaibhav


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