[PATCH v2 2/2] socfpga: support suspend to ram

Hi!

From: Alan Tull <redacted>

Add code that requests that the sdr controller go into
self-refresh mode.  This code is run from ocram.

This patch assumes that u-boot has already configured sdr:
  sdr.ctrlcfg.lowpwreq.selfrfshmask = 3
  sdr.ctrlcfg.lowpwrtiming.clkdisablecycles = 8
  sdr.ctrlcfg.dramtiming4.selfrfshexit = 512

How to suspend to ram:
 $ echo enabled > \
/sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup

 $ echo -n mem > /sys/power/state

Signed-off-by: Alan Tull <redacted>

+static int __init socfpga_pm_init(void)
+{
+	if (socfpga_setup_ocram_self_refresh())
+		return -EFAULT;

It would be nice to propagate the error result here.

Best regards,
									Pavel
-- 
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