summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorPeter Ujfalusi <peter.ujfalusi@ti.com>2014-04-03 13:54:41 +0300
committerLee Jones <lee.jones@linaro.org>2014-06-03 08:11:20 +0100
commit68bab8662f49b9e158f1d32f11becd4e48c04079 (patch)
tree7d10c7dd0ca07d390f00982b10079ffdab069975
parent11e38e11afcdd598d0978746924a001e3e7cb723 (diff)
mfd: twl6040: Optional clk32k clock handling
In certain boards the source for the clk32k clock can be gated. In these boards the clk32k clock can be provided to the driver and it is going to be enabled/disabled when it is needed. If the clk32k clock is not provided the driver will assume that it is always running. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
-rw-r--r--Documentation/devicetree/bindings/mfd/twl6040.txt2
-rw-r--r--drivers/mfd/twl6040.c10
-rw-r--r--include/linux/mfd/twl6040.h2
3 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mfd/twl6040.txt b/Documentation/devicetree/bindings/mfd/twl6040.txt
index 0f5dd709d75..a41157b5d93 100644
--- a/Documentation/devicetree/bindings/mfd/twl6040.txt
+++ b/Documentation/devicetree/bindings/mfd/twl6040.txt
@@ -19,6 +19,8 @@ Required properties:
Optional properties, nodes:
- enable-active-high: To power on the twl6040 during boot.
+- clocks: phandle to the clk32k clock provider
+- clock-names: Must be "clk32k"
Vibra functionality
Required properties:
diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
index cb37bb8f8e4..574774d7f82 100644
--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -291,6 +291,8 @@ int twl6040_power(struct twl6040 *twl6040, int on)
if (twl6040->power_count++)
goto out;
+ clk_prepare_enable(twl6040->clk32k);
+
/* Allow writes to the chip */
regcache_cache_only(twl6040->regmap, false);
@@ -346,6 +348,8 @@ int twl6040_power(struct twl6040 *twl6040, int on)
twl6040->sysclk = 0;
twl6040->mclk = 0;
+
+ clk_disable_unprepare(twl6040->clk32k);
}
out:
@@ -644,6 +648,12 @@ static int twl6040_probe(struct i2c_client *client,
i2c_set_clientdata(client, twl6040);
+ twl6040->clk32k = devm_clk_get(&client->dev, "clk32k");
+ if (IS_ERR(twl6040->clk32k)) {
+ dev_info(&client->dev, "clk32k is not handled\n");
+ twl6040->clk32k = NULL;
+ }
+
twl6040->supplies[0].supply = "vio";
twl6040->supplies[1].supply = "v2v1";
ret = devm_regulator_bulk_get(&client->dev, TWL6040_NUM_SUPPLIES,
diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h
index a69d16b30c1..8f9fc3d26e6 100644
--- a/include/linux/mfd/twl6040.h
+++ b/include/linux/mfd/twl6040.h
@@ -28,6 +28,7 @@
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/regulator/consumer.h>
+#include <linux/clk.h>
#define TWL6040_REG_ASICID 0x01
#define TWL6040_REG_ASICREV 0x02
@@ -223,6 +224,7 @@ struct twl6040 {
struct regmap *regmap;
struct regmap_irq_chip_data *irq_data;
struct regulator_bulk_data supplies[2]; /* supplies for vio, v2v1 */
+ struct clk *clk32k;
struct mutex mutex;
struct mutex irq_mutex;
struct mfd_cell cells[TWL6040_CELLS];