mfd: atmel-flexcom: Use .resume_noirq

[ Upstream commit 5d051cf94f ]

Flexcom IP embeds 3 other IPs: usart, i2c, spi and selects the operation
mode (usart, i2c, spi) via mode register (FLEX_MR). On i2c bus there might
be connected critical devices (like PMIC) which on suspend/resume should
be suspended/resumed at the end/beginning. i2c uses
.suspend_noirq/.resume_noirq for this kind of purposes. Align flexcom
to use .resume_noirq as it should be resumed before the embedded IPs.
Otherwise the embedded devices might behave badly.

Fixes: 7fdec11015 ("atmel_flexcom: Support resuming after a chip reset")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Tested-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211028135138.3481166-3-claudiu.beznea@microchip.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/mfd/atmel-flexcom.c

@@ -87,7 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
 
-static int __maybe_unused atmel_flexcom_resume(struct device *dev)
+static int __maybe_unused atmel_flexcom_resume_noirq(struct device *dev)
 {
 	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
 	int err;
@@ -105,8 +105,9 @@ static int __maybe_unused atmel_flexcom_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
-			 atmel_flexcom_resume);
+static const struct dev_pm_ops atmel_flexcom_pm_ops = {
+	.resume_noirq = atmel_flexcom_resume_noirq,
+};
 
 static struct platform_driver atmel_flexcom_driver = {
 	.probe	= atmel_flexcom_probe,