Commit 68bab866 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Lee Jones
Browse files

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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 11e38e11

Documentation/devicetree/bindings/mfd/twl6040.txt

+2 −0
Original line number Diff line number Diff line
@@ -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:

drivers/mfd/twl6040.c

+10 −0
Original line number Diff line number Diff line
@@ -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,

include/linux/mfd/twl6040.h

+2 −0
Original line number Diff line number Diff line
@@ -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];

CRA Git | Maintained and supported by SUSTech CRA and CCSE