mfd: twl6040: Register child device for twl6040-pdmclk

The McPDM in OMAP4/5 is using the pdmclk from twl6040 as functional clock.
The twl6040-pdmclk driver provides a clock which can be used to make sure
that the pdmclk is active when the McPDM is in use.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 7 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/mfd/twl6040.txt b/Documentation/devicetree/bindings/mfd/twl6040.txt
index e6afdfa3543d..9a98ee7c323d 100644
--- a/Documentation/devicetree/bindings/mfd/twl6040.txt
+++ b/Documentation/devicetree/bindings/mfd/twl6040.txt
@@ -12,6 +12,7 @@ Required properties:
 - interrupt-parent: The parent interrupt controller
 - gpio-controller:
 - #gpio-cells = <1>: twl6040 provides GPO lines.
+- #clock-cells = <0>; twl6040 is a provider of pdmclk which is used by McPDM
 - twl6040,audpwron-gpio: Power on GPIO line for the twl6040
 
 - vio-supply: Regulator for the twl6040 VIO supply
diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
index c3ad59ef43dd..d66502d36ba0 100644
--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -783,6 +783,11 @@ static int twl6040_probe(struct i2c_client *client,
         cell->name = "twl6040-gpo";
         children++;
 
+        /* PDM clock support  */
+        cell = &twl6040->cells[children];
+        cell->name = "twl6040-pdmclk";
+        children++;
+
         /* The chip is powered down so mark regmap to cache only and dirty */
         regcache_cache_only(twl6040->regmap, true);
         regcache_mark_dirty(twl6040->regmap);
diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h
index 36795a1be479..a2e88761c09f 100644
--- a/include/linux/mfd/twl6040.h
+++ b/include/linux/mfd/twl6040.h
@@ -168,7 +168,7 @@
 #define TWL6040_VIBROCDET               0x20
 #define TWL6040_TSHUTDET                0x40
 
-#define TWL6040_CELLS                   3
+#define TWL6040_CELLS                   4
 
 #define TWL6040_REV_ES1_0               0x00
 #define TWL6040_REV_ES1_1               0x01 /* Rev ES1.1 and ES1.2 */