memory: gpmc: adopt pinctrl support

Update omap gpmc driver to set the state of the pins to:
- "sleep" on suspend
- "default" on resume

By optionally putting the pins into sleep state in the suspend callback
we can accomplish two things.
- minimize current leakage from pins and thus save power,
- prevent the IP from driving pins output in an uncontrolled manner,
which may happen if the power domain drops the domain regulator.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
[d-gerlach@ti.com: Moved from mach-omap2 gpmc driver to drivers/memory]
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 8911e51d410a..6a64d7c5f888 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -2189,11 +2189,18 @@ static int gpmc_suspend(struct device *dev)
 {
         omap3_gpmc_save_context();
         pm_runtime_put_sync(dev);
+
+        /* Select sleep pin state */
+        pinctrl_pm_select_sleep_state(dev);
+
         return 0;
 }
 
 static int gpmc_resume(struct device *dev)
 {
+        /* Select default pin state */
+        pinctrl_pm_select_default_state(dev);
+
         pm_runtime_get_sync(dev);
         omap3_gpmc_restore_context();
         return 0;