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mfd: twl6040: Optional clk32k clock handling

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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>
This commit is contained in:
Peter Ujfalusi 2014-04-03 13:54:41 +03:00 committed by Lee Jones
parent 11e38e11af
commit 68bab8662f
3 changed files with 14 additions and 0 deletions
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2
Documentation/devicetree/bindings/mfd/twl6040.txt
View File

@ -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:

10
drivers/mfd/twl6040.c
View File

@ -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,

2
include/linux/mfd/twl6040.h
View File

@ -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];