mfd: Store twl6040-codec mclk configuration

Store the last used mclk configuration for the PLL.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
index dda8629..c2088f4 100644
--- a/drivers/mfd/twl6040-core.c
+++ b/drivers/mfd/twl6040-core.c
@@ -282,6 +282,7 @@
 		/* Default PLL configuration after power up */
 		twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
 		twl6040->sysclk = 19200000;
+		twl6040->mclk = 32768;
 	} else {
 		/* already powered-down */
 		if (!twl6040->power_count) {
@@ -305,6 +306,7 @@
 			twl6040_power_down(twl6040);
 		}
 		twl6040->sysclk = 0;
+		twl6040->mclk = 0;
 	}
 
 out:
@@ -421,6 +423,7 @@
 	}
 
 	twl6040->sysclk = freq_out;
+	twl6040->mclk = freq_in;
 	twl6040->pll = pll_id;
 
 pll_out: