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SubjectRe: [PATCH] mtd: atmel-quadspi: add suspend/resume hooks
On Wed, 23 May 2018 19:08:48 +0300
Claudiu Beznea <claudiu.beznea@microchip.com> wrote:

> Implement suspend/resume hooks.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.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)
...

> +
> +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,

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