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

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Date:	Tue, 02 Jun 2015 10:37:32 +0530
From:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	rtc-linux@...glegroups.com, sameo@...ux.intel.com,
	a.zummo@...ertech.it, alexandre.belloni@...e-electrons.com,
	Chao Xie <chao.xie@...vell.com>
Subject: Re: [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@...vell.com>
>> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@...aro.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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