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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>
hifive-unleashed-5.1
Quentin Schulz 2017-04-14 10:22:43 +02:00 committed by Mark Brown
parent 05514c8696
commit e53800787a
1 changed files with 9 additions and 0 deletions
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9
drivers/spi/spi-atmel.c
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@ -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)