[PATCH for-next v1 2/3] pinctrl: baytrail: add warning for BYT_VAL_REG retrieval failure

[Raag Jadav <raag.jadav@intel.com>]

Add warning for BYT_VAL_REG retrieval failure and continue such case
to avoid unintended reads/writes in pm_ops.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
---
 drivers/pinctrl/intel/pinctrl-baytrail.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
index 54d3c5c26944..97ead2c58b66 100644
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1758,6 +1758,10 @@ static int byt_gpio_suspend(struct device *dev)
 		vg->context.pads[i].conf0 = value;
 
 		reg = byt_gpio_reg(vg, pin, BYT_VAL_REG);
+		if (!reg) {
+			dev_warn(vg->dev, "Pin %i: can't retrieve VAL\n", i);
+			continue;
+		}
 		value = readl(reg) & BYT_VAL_RESTORE_MASK;
 		vg->context.pads[i].val = value;
 	}
@@ -1794,6 +1798,10 @@ static int byt_gpio_resume(struct device *dev)
 		}
 
 		reg = byt_gpio_reg(vg, pin, BYT_VAL_REG);
+		if (!reg) {
+			dev_warn(vg->dev, "Pin %i: can't retrieve VAL\n", i);
+			continue;
+		}
 		value = readl(reg);
 		if ((value & BYT_VAL_RESTORE_MASK) !=
 		     vg->context.pads[i].val) {
-- 
2.17.1