ASoC: rt5677: Add option to configure gpio as floating/pullup/pulldown

gpio_config is array of 6 elements that allows to set GPIO as
floating, pullup, pulldown.

Sponsored: Google ChromeOS
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 49 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/rt5677.txt b/Documentation/devicetree/bindings/sound/rt5677.txt
index 0701b834fc73..f82f0e906cd9 100644
--- a/Documentation/devicetree/bindings/sound/rt5677.txt
+++ b/Documentation/devicetree/bindings/sound/rt5677.txt
@@ -27,6 +27,12 @@ Optional properties:
   Boolean. Indicate MIC1/2 input and LOUT1/2/3 outputs are differential,
   rather than single-ended.
 
+- realtek,gpio-config
+  Array of six 8bit elements that configures GPIO.
+    0 - floating (reset value)
+    1 - pull down
+    2 - pull up
+
 Pins on the device (for linking into audio routes):
 
   * IN1P
@@ -56,4 +62,5 @@ rt5677 {
         realtek,pow-ldo2-gpio =
                 <&gpio TEGRA_GPIO(V, 3) GPIO_ACTIVE_HIGH>;
         realtek,in1-differential = "true";
+        realtek,gpio-config = /bits/ 8  <0 0 0 0 0 2>;   /* pull up GPIO6 */
 };
diff --git a/include/sound/rt5677.h b/include/sound/rt5677.h
index 082670e3a353..a56b429a1dbc 100644
--- a/include/sound/rt5677.h
+++ b/include/sound/rt5677.h
@@ -27,6 +27,9 @@ struct rt5677_platform_data {
         bool lout3_diff;
         /* DMIC2 clock source selection */
         enum rt5677_dmic2_clk dmic2_clk_pin;
+
+        /* configures GPIO, 0 - floating, 1 - pulldown, 2 - pullup */
+        u8 gpio_config[6];
 };
 
 #endif
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 16aa4d99a713..a454df39b7a5 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -3309,6 +3309,38 @@ static int rt5677_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
         return 0;
 }
 
+/** Configures the gpio as
+ *   0 - floating
+ *   1 - pull down
+ *   2 - pull up
+ */
+static void rt5677_gpio_config(struct rt5677_priv *rt5677, unsigned offset,
+                int value)
+{
+        int shift;
+
+        switch (offset) {
+        case RT5677_GPIO1 ... RT5677_GPIO2:
+                shift = 2 * (1 - offset);
+                regmap_update_bits(rt5677->regmap,
+                        RT5677_PR_BASE + RT5677_DIG_IN_PIN_ST_CTRL2,
+                        0x3 << shift,
+                        (value & 0x3) << shift);
+                break;
+
+        case RT5677_GPIO3 ... RT5677_GPIO6:
+                shift = 2 * (9 - offset);
+                regmap_update_bits(rt5677->regmap,
+                        RT5677_PR_BASE + RT5677_DIG_IN_PIN_ST_CTRL3,
+                        0x3 << shift,
+                        (value & 0x3) << shift);
+                break;
+
+        default:
+                break;
+        }
+}
+
 static struct gpio_chip rt5677_template_chip = {
         .label                  = "rt5677",
         .owner                  = THIS_MODULE,
@@ -3353,6 +3385,7 @@ static void rt5677_free_gpio(struct i2c_client *i2c)
 static int rt5677_probe(struct snd_soc_codec *codec)
 {
         struct rt5677_priv *rt5677 = snd_soc_codec_get_drvdata(codec);
+        int i;
 
         rt5677->codec = codec;
 
@@ -3371,6 +3404,9 @@ static int rt5677_probe(struct snd_soc_codec *codec)
         regmap_write(rt5677->regmap, RT5677_DIG_MISC, 0x0020);
         regmap_write(rt5677->regmap, RT5677_PWR_DSP2, 0x0c00);
 
+        for (i = 0; i < RT5677_GPIO_NUM; i++)
+                rt5677_gpio_config(rt5677, i, rt5677->pdata.gpio_config[i]);
+
         return 0;
 }
 
@@ -3590,6 +3626,9 @@ static int rt5677_parse_dt(struct rt5677_priv *rt5677, struct device_node *np)
                         (rt5677->pow_ldo2 != -ENOENT))
                 return rt5677->pow_ldo2;
 
+        of_property_read_u8_array(np, "realtek,gpio-config",
+                rt5677->pdata.gpio_config, RT5677_GPIO_NUM);
+
         return 0;
 }