mfd: arizona: Sync regcache after reset

In the absence of a physical reset line the chip is reset by writing the
first register, which is done after the register patch has been applied.
This patch synchronises the register cache after the reset to preserve
any register changes that had been applied.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/arizona-core.c

@@ -415,11 +415,19 @@ int __devinit arizona_dev_init(struct arizona *arizona)
 
 	/* If we have a /RESET GPIO we'll already be reset */
 	if (!arizona->pdata.reset) {
+		regcache_mark_dirty(arizona->regmap);
+
 		ret = regmap_write(arizona->regmap, ARIZONA_SOFTWARE_RESET, 0);
 		if (ret != 0) {
 			dev_err(dev, "Failed to reset device: %d\n", ret);
 			goto err_reset;
 		}
+
+		ret = regcache_sync(arizona->regmap);
+		if (ret != 0) {
+			dev_err(dev, "Failed to sync device: %d\n", ret);
+			goto err_reset;
+		}
 	}
 
 	ret = arizona_wait_for_boot(arizona);