[PATCH v5 2/2] ASoC: tlv320adcx140: Add support for configuring GPIO pin

[Camel Guo]

From: Camel Guo <cam...@axis.com>

Add support to configure the GPIO pin to the specific configuration.
The GPIO pin can be configured as GPO, IRQ, SDOUT2, PDMCLK, MICBASE_EN,
GPI, MCLK, SDIN, PDMDIN1, PDMDIN2, PDMDIN3 or PDMDIN4 and the output
drive can be configured with various configuration.

Signed-off-by: Camel Guo <cam...@axis.com>
---
 v4:
  - Rebase and fix merge conflict
  - Add Acked-by from Dan
 v3:
  - Add ADCX140_NUM_GPIO_CFGS avoiding using magic number
  - Remove unneeded check on ret in adcx140_configure_gpio

 sound/soc/codecs/tlv320adcx140.c | 40 ++++++++++++++++++++++++++++++++
 sound/soc/codecs/tlv320adcx140.h |  5 ++++
 2 files changed, 45 insertions(+)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index 28dbd7d5e149..53a80246aee1 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -861,6 +861,42 @@ static int adcx140_configure_gpo(struct adcx140_priv 
*adcx140)
 
 }
 
+static int adcx140_configure_gpio(struct adcx140_priv *adcx140)
+{
+       int gpio_count = 0;
+       u32 gpio_outputs[ADCX140_NUM_GPIO_CFGS];
+       u32 gpio_output_val = 0;
+       int ret;
+
+       gpio_count = device_property_count_u32(adcx140->dev,
+                       "ti,gpio-config");
+       if (gpio_count == 0)
+               return 0;
+
+       if (gpio_count != ADCX140_NUM_GPIO_CFGS)
+               return -EINVAL;
+
+       ret = device_property_read_u32_array(adcx140->dev, "ti,gpio-config",
+                       gpio_outputs, gpio_count);
+       if (ret)
+               return ret;
+
+       if (gpio_outputs[0] > ADCX140_GPIO_CFG_MAX) {
+               dev_err(adcx140->dev, "GPIO config out of range\n");
+               return -EINVAL;
+       }
+
+       if (gpio_outputs[1] > ADCX140_GPIO_DRV_MAX) {
+               dev_err(adcx140->dev, "GPIO drive out of range\n");
+               return -EINVAL;
+       }
+
+       gpio_output_val = gpio_outputs[0] << ADCX140_GPIO_SHIFT
+               | gpio_outputs[1];
+
+       return regmap_write(adcx140->regmap, ADCX140_GPIO_CFG0, 
gpio_output_val);
+}
+
 static int adcx140_codec_probe(struct snd_soc_component *component)
 {
        struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
@@ -958,6 +994,10 @@ static int adcx140_codec_probe(struct snd_soc_component 
*component)
                        return ret;
        }
 
+       ret = adcx140_configure_gpio(adcx140);
+       if (ret)
+               return ret;
+
        ret = adcx140_configure_gpo(adcx140);
        if (ret)
                goto out;
diff --git a/sound/soc/codecs/tlv320adcx140.h b/sound/soc/codecs/tlv320adcx140.h
index 107bd7927d9c..d7d4e3a88b5c 100644
--- a/sound/soc/codecs/tlv320adcx140.h
+++ b/sound/soc/codecs/tlv320adcx140.h
@@ -148,4 +148,9 @@
 
 #define ADCX140_TX_FILL    BIT(0)
 
+#define ADCX140_NUM_GPIO_CFGS          2
+#define ADCX140_GPIO_SHIFT             4
+#define ADCX140_GPIO_CFG_MAX           15
+#define ADCX140_GPIO_DRV_MAX           5
+
 #endif /* _TLV320ADCX140_ */
-- 
2.20.1