Commit e5380078 authored Apr 14, 2017 by Quentin Schulz Committed by Mark Brown Apr 18, 2017

spi: atmel: add deepest PM support to SAMA5D2



This adds deepest (Backup+Self-Refresh) PM support to the ATMEL SAMA5D2
SoC's SPI controller.

When resuming from deepest state, it is required to restore MR register
as the registers are lost since VDD core has been shut down when
entering deepest state on the SAMA5D2.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent 05514c86

drivers/spi/spi-atmel.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev)
		static int atmel_spi_resume(struct device *dev)
		{
		struct spi_master *master = dev_get_drvdata(dev);
		struct atmel_spi *as = spi_master_get_devdata(master);
		int ret;

		ret = clk_prepare_enable(as->clk);
		if (ret)
		return ret;

		atmel_spi_init(as);

		clk_disable_unprepare(as->clk);

		if (!pm_runtime_suspended(dev)) {
		ret = atmel_spi_runtime_resume(dev);
		if (ret)

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