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Commit 019a7e6b authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Samuel Ortiz
Browse files

mfd: twl4030-audio: Add DT support 



Support for loading the twl4030 audio module via devicetree.
Sub devices for codec and vibra will be created as mfd devices once the
core MFD driver is loaded when the kernel is booted with a DT blob.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 1cc44f43

Documentation/devicetree/bindings/mfd/twl4030-audio.txt

0 → 100644
+46 −0
Original line number Diff line number Diff line 
Texas Instruments TWL family (twl4030) audio module



The audio module inside the TWL family consist of an audio codec and a vibra

driver.



Required properties:

- compatible : must be "ti,twl4030-audio"



Optional properties, nodes:



Audio functionality:

- codec { }: Need to be present if the audio functionality is used. Within this

	     section the following options can be used:

- ti,digimic_delay: Delay need after enabling the digimic to reduce artifacts

		    from the start of the recorded sample (in ms)

-ti,ramp_delay_value: HS ramp delay configuration to reduce pop noise

-ti,hs_extmute: Use external mute for HS pop reduction

-ti,hs_extmute_gpio: Use external GPIO to control the external mute

-ti,offset_cncl_path: Offset cancellation path selection, refer to TRM for the

		      valid values.



Vibra functionality

- ti,enable-vibra: Need to be set to <1> if the vibra functionality is used. if

		   missing or it is 0, the vibra functionality is disabled.



Example:

&i2c1 {

	clock-frequency = <2600000>;



	twl: twl@48 {

		reg = <0x48>;

		interrupts = <7>; /* SYS_NIRQ cascaded to intc */

		interrupt-parent = <&intc>;



		twl_audio: audio {

			compatible = "ti,twl4030-audio";



			ti,enable-vibra = <1>;



			codec {

				ti,ramp_delay_value = <3>;

			};



		};

	};

};

drivers/mfd/twl4030-audio.c

+47 −7
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ 
#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/i2c/twl.h>

#include <linux/mfd/core.h>

#include <linux/mfd/twl4030-audio.h>
@@ -156,15 +158,42 @@ unsigned int twl4030_audio_get_mclk(void) 
}

EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);



static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,

			      struct device_node *node)

{

	if (pdata && pdata->codec)

		return true;



	if (of_find_node_by_name(node, "codec"))

		return true;



	return false;

}



static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,

			      struct device_node *node)

{

	int vibra;



	if (pdata && pdata->vibra)

		return true;



	if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)

		return true;



	return false;

}



static int __devinit twl4030_audio_probe(struct platform_device *pdev)

{

	struct twl4030_audio *audio;

	struct twl4030_audio_data *pdata = pdev->dev.platform_data;

	struct device_node *node = pdev->dev.of_node;

	struct mfd_cell *cell = NULL;

	int ret, childs = 0;

	u8 val;



	if (!pdata) {

	if (!pdata && !node) {

		dev_err(&pdev->dev, "Platform data is missing\n");

		return -EINVAL;

	}
@@ -202,18 +231,22 @@ static int __devinit twl4030_audio_probe(struct platform_device *pdev) 
	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;

	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;



	if (pdata->codec) {

	if (twl4030_audio_has_codec(pdata, node)) {

		cell = &audio->cells[childs];

		cell->name = "twl4030-codec";

		if (pdata) {

			cell->platform_data = pdata->codec;

			cell->pdata_size = sizeof(*pdata->codec);

		}

		childs++;

	}

	if (pdata->vibra) {

	if (twl4030_audio_has_vibra(pdata, node)) {

		cell = &audio->cells[childs];

		cell->name = "twl4030-vibra";

		if (pdata) {

			cell->platform_data = pdata->vibra;

			cell->pdata_size = sizeof(*pdata->vibra);

		}

		childs++;

	}
@@ -245,10 +278,17 @@ static int __devexit twl4030_audio_remove(struct platform_device *pdev) 
	return 0;

}



static const struct of_device_id twl4030_audio_of_match[] = {

	{.compatible = "ti,twl4030-audio", },

	{ },

};

MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);



static struct platform_driver twl4030_audio_driver = {

	.driver		= {

		.owner	= THIS_MODULE,

		.name	= "twl4030-audio",

		.of_match_table = twl4030_audio_of_match,

	},

	.probe		= twl4030_audio_probe,

	.remove		= __devexit_p(twl4030_audio_remove),