linux-kernel - Re: [PATCH] mtd: atmel-quadspi: add suspend/resume hooks

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Date:   Mon, 4 Jun 2018 10:43:06 +0300
From:   Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     <marek.vasut@...il.com>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <richard@....at>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mtd: atmel-quadspi: add suspend/resume hooks



On 29.05.2018 22:15, Boris Brezillon wrote:
> On Wed, 23 May 2018 19:08:48 +0300
> Claudiu Beznea <claudiu.beznea@...rochip.com> wrote:
> 
>> Implement suspend/resume hooks.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>>  drivers/mtd/spi-nor/atmel-quadspi.c | 23 +++++++++++++++++++++++
>>  1 file changed, 23 insertions(+)
>>
>> diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c
>> index 6c5708bacad8..85d7610fb920 100644
>> --- a/drivers/mtd/spi-nor/atmel-quadspi.c
>> +++ b/drivers/mtd/spi-nor/atmel-quadspi.c
>> @@ -737,6 +737,28 @@ static int atmel_qspi_remove(struct platform_device *pdev)
>>  	return 0;
>>  }
>>  
>> +#ifdef CONFIG_PM_SLEEP
>> +static int atmel_qspi_suspend(struct device *dev)
>> +{
>> +	struct atmel_qspi *aq = dev_get_drvdata(dev);
>> +
>> +	clk_disable_unprepare(aq->clk);
>> +
>> +	return 0;
>> +}
>> +
>> +static int atmel_qspi_resume(struct device *dev)
>> +{
>> +	struct atmel_qspi *aq = dev_get_drvdata(dev);
>> +
>> +	clk_prepare_enable(aq->clk);
>> +
>> +	return atmel_qspi_init(aq);
>> +}
>> +#endif
> 
> You can avoid this #ifdef section if you use the __maybe_unused
> specifier:
> 
> static __maybe_unused int atmel_qspi_suspend(struct device *dev)
> ...

I balanced b/w using #ifdef and __maybe_unused.

I will prepare a new version to replace #ifdef with __maybe_unsed.

Thank you,
Claudiu Beznea

> 
>> +
>> +static SIMPLE_DEV_PM_OPS(atmel_qspi_pm_ops, atmel_qspi_suspend,
>> +			 atmel_qspi_resume);
>>  
>>  static const struct of_device_id atmel_qspi_dt_ids[] = {
>>  	{ .compatible = "atmel,sama5d2-qspi" },
>> @@ -749,6 +771,7 @@ static struct platform_driver atmel_qspi_driver = {
>>  	.driver = {
>>  		.name	= "atmel_qspi",
>>  		.of_match_table	= atmel_qspi_dt_ids,
>> +		.pm	= &atmel_qspi_pm_ops,
>>  	},
>>  	.probe		= atmel_qspi_probe,
>>  	.remove		= atmel_qspi_remove,
> 
>