ASoC: Intel: byt-max98090: Add GPIO ACPI mapping table

In order to make GPIO ACPI library stricter prepare users of
gpiod_get_index() to correctly behave when there no mapping is
provided by firmware.

Here we add explicit mapping between _CRS GpioIo() resources and
their names used in the driver.

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Nicolas Porcel <nicolasporcel06@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/byt-max98090.c

@@ -67,20 +67,27 @@ static struct snd_soc_jack_pin hs_jack_pins[] = {
 
 static struct snd_soc_jack_gpio hs_jack_gpios[] = {
 	{
-		.name		= "hp-gpio",
-		.idx		= 0,
+		.name		= "hp",
 		.report		= SND_JACK_HEADPHONE | SND_JACK_LINEOUT,
 		.debounce_time	= 200,
 	},
 	{
-		.name		= "mic-gpio",
-		.idx		= 1,
+		.name		= "mic",
 		.invert		= 1,
 		.report		= SND_JACK_MICROPHONE,
 		.debounce_time	= 200,
 	},
 };
 
+static const struct acpi_gpio_params hp_gpios = { 0, 0, false };
+static const struct acpi_gpio_params mic_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_byt_max98090_gpios[] = {
+	{ "hp-gpios", &hp_gpios, 1 },
+	{ "mic-gpios", &mic_gpios, 1 },
+	{},
+};
+
 static int byt_max98090_init(struct snd_soc_pcm_runtime *runtime)
 {
 	int ret;
@@ -140,8 +147,9 @@ static struct snd_soc_card byt_max98090_card = {
 
 static int byt_max98090_probe(struct platform_device *pdev)
 {
-	int ret_val = 0;
+	struct device *dev = &pdev->dev;
 	struct byt_max98090_private *priv;
+	int ret_val;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_ATOMIC);
 	if (!priv) {
@@ -149,6 +157,10 @@ static int byt_max98090_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	ret_val = devm_acpi_dev_add_driver_gpios(dev->parent, acpi_byt_max98090_gpios);
+	if (ret_val)
+		dev_dbg(dev, "Unable to add GPIO mapping table\n");
+
 	byt_max98090_card.dev = &pdev->dev;
 	snd_soc_card_set_drvdata(&byt_max98090_card, priv);
 	ret_val = devm_snd_soc_register_card(&pdev->dev, &byt_max98090_card);
@@ -158,7 +170,7 @@ static int byt_max98090_probe(struct platform_device *pdev)
 		return ret_val;
 	}
 
-	return ret_val;
+	return 0;
 }
 
 static int byt_max98090_remove(struct platform_device *pdev)