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ASoC: rt5640: add device tree support 

Modify the RT5640 driver to parse platform data from device tree. Write
a DT binding document to describe those properties.

Slight re-ordering of rt5640_i2c_probe() to better fit the DT parsing.

Since ldo1_en is optional, guard usage of it with gpio_is_valid(), rather
than open-coding an if (gpio) check.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Stephen Warren 2013-06-12 11:34:30 -06:00 committed by Mark Brown
parent 997b05203b
commit dcad9f0312
2 changed files with 72 additions and 6 deletions
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30
Documentation/devicetree/bindings/sound/rt5640.txt Normal file
View File

@ -0,0 +1,30 @@
RT5640 audio CODEC
This device supports I2C only.
Required properties:
- compatible : "realtek,rt5640".
- reg : The I2C address of the device.
- interrupts : The CODEC's interrupt output.
Optional properties:
- realtek,in1-differential
- realtek,in2-differential
Boolean. Indicate MIC1/2 input are differential, rather than single-ended.
- realtek,ldo1-en-gpios : The GPIO that controls the CODEC's LDO1_EN pin.
Example:
rt5640 {
compatible = "realtek,rt5640";
reg = <0x1c>;
interrupt-parent = <&gpio>;
interrupts = <TEGRA_GPIO(W, 3) GPIO_ACTIVE_HIGH>;
realtek,ldo1-en-gpios =
<&gpio TEGRA_GPIO(V, 3) GPIO_ACTIVE_HIGH>;
};

48
sound/soc/codecs/rt5640.c
View File

@ -18,6 +18,7 @@
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <sound/core.h>
@ -1998,6 +1999,28 @@ static const struct i2c_device_id rt5640_i2c_id[] = {
};
MODULE_DEVICE_TABLE(i2c, rt5640_i2c_id);
static int rt5640_parse_dt(struct rt5640_priv *rt5640, struct device_node *np)
{
rt5640->pdata.in1_diff = of_property_read_bool(np,
"realtek,in1-differential");
rt5640->pdata.in2_diff = of_property_read_bool(np,
"realtek,in2-differential");
rt5640->pdata.ldo1_en = of_get_named_gpio(np,
"realtek,ldo1-en-gpios", 0);
/*
* LDO1_EN is optional (it may be statically tied on the board).
* -ENOENT means that the property doesn't exist, i.e. there is no
* GPIO, so is not an error. Any other error code means the property
* exists, but could not be parsed.
*/
if (!gpio_is_valid(rt5640->pdata.ldo1_en) &&
(rt5640->pdata.ldo1_en != -ENOENT))
return rt5640->pdata.ldo1_en;
return 0;
}
static int rt5640_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
@ -2011,6 +2034,24 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
GFP_KERNEL);
if (NULL == rt5640)
return -ENOMEM;
i2c_set_clientdata(i2c, rt5640);
if (pdata) {
rt5640->pdata = *pdata;
/*
* Translate zero'd out (default) pdata value to an invalid
* GPIO ID. This makes the pdata and DT paths consistent in
* terms of the value left in this field when no GPIO is
* specified, but means we can't actually use GPIO 0.
*/
if (!rt5640->pdata.ldo1_en)
rt5640->pdata.ldo1_en = -EINVAL;
} else if (i2c->dev.of_node) {
ret = rt5640_parse_dt(rt5640, i2c->dev.of_node);
if (ret)
return ret;
} else
rt5640->pdata.ldo1_en = -EINVAL;
rt5640->regmap = devm_regmap_init_i2c(i2c, &rt5640_regmap);
if (IS_ERR(rt5640->regmap)) {
@ -2020,12 +2061,7 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
return ret;
}
if (pdata)
rt5640->pdata = *pdata;
i2c_set_clientdata(i2c, rt5640);
if (rt5640->pdata.ldo1_en) {
if (gpio_is_valid(rt5640->pdata.ldo1_en)) {
ret = devm_gpio_request_one(&i2c->dev, rt5640->pdata.ldo1_en,
GPIOF_OUT_INIT_HIGH,
"RT5640 LDO1_EN");