asoc: msm-cdc-pinctrl: Add alternate pinctrl state for DSD input

Add additional pinctrl states to support alternative function.
This change enables support of alternative pins through pinctrl
framework.

Change-Id: I1f3f9a13345846f1714b4ecaeecde975b5cf6813
Signed-off-by: Sanjana B <[email protected]>

asoc/codecs/msm-cdc-pinctrl.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -21,6 +21,7 @@ struct msm_cdc_pinctrl_info {
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *pinctrl_active;
 	struct pinctrl_state *pinctrl_sleep;
+	struct pinctrl_state *pinctrl_alt_active;
 	int gpio;
 	bool state;
 	u32 tlmm_gpio[MAX_GPIOS];
@@ -104,6 +105,31 @@ int msm_cdc_pinctrl_select_sleep_state(struct device_node *np)
 }
 EXPORT_SYMBOL(msm_cdc_pinctrl_select_sleep_state);
 
+/*
+ * msm_cdc_pinctrl_select_alt_active_state: select pinctrl alt_active state
+ * @np: pointer to struct device_node
+ *
+ * Returns error code for failure
+ */
+int msm_cdc_pinctrl_select_alt_active_state(struct device_node *np)
+{
+	struct msm_cdc_pinctrl_info *gpio_data;
+
+	gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
+	if (!gpio_data)
+		return -EINVAL;
+
+	if (!gpio_data->pinctrl_alt_active) {
+		pr_err("%s: pinctrl alt_active state is null\n", __func__);
+		return -EINVAL;
+	}
+	gpio_data->state = true;
+
+	return pinctrl_select_state(gpio_data->pinctrl,
+				    gpio_data->pinctrl_alt_active);
+}
+EXPORT_SYMBOL(msm_cdc_pinctrl_select_alt_active_state);
+
 /*
  * msm_cdc_pinctrl_select_active_state: select pinctrl active state
  * @np: pointer to struct device_node
@@ -231,6 +257,14 @@ static int msm_cdc_pinctrl_probe(struct platform_device *pdev)
 		ret = PTR_ERR(gpio_data->pinctrl_sleep);
 		goto err_lookup_state;
 	}
+
+	gpio_data->pinctrl_alt_active = pinctrl_lookup_state(
+					gpio_data->pinctrl, "aud_alt_active");
+	if (IS_ERR_OR_NULL(gpio_data->pinctrl_alt_active)) {
+		dev_dbg(&pdev->dev, "%s: Cannot get aud_alt_active pinctrl state:%ld\n",
+			__func__, PTR_ERR(gpio_data->pinctrl_alt_active));
+	}
+
 	/* skip setting to sleep state for LPI_TLMM GPIOs */
 	if (!of_property_read_bool(pdev->dev.of_node, "qcom,lpi-gpios")) {
 		/* Set pinctrl state to aud_sleep by default */

include/asoc/msm-cdc-pinctrl.h

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
  */
 
 #ifndef __MFD_CDC_PINCTRL_H_
@@ -11,6 +11,7 @@
 #if IS_ENABLED(CONFIG_MSM_CDC_PINCTRL)
 extern int msm_cdc_pinctrl_select_sleep_state(struct device_node *np);
 extern int msm_cdc_pinctrl_select_active_state(struct device_node *np);
+extern int msm_cdc_pinctrl_select_alt_active_state(struct device_node *np);
 extern int msm_cdc_pinctrl_get_state(struct device_node *np);
 extern int msm_cdc_get_gpio_state(struct device_node *np);
 extern int msm_cdc_pinctrl_set_wakeup_capable(struct device_node *np,
@@ -27,6 +28,10 @@ int msm_cdc_pinctrl_select_active_state(struct device_node *np)
 {
 	return 0;
 }
+int msm_cdc_pinctrl_select_alt_active_state(struct device_node *np)
+{
+	return 0;
+}
 int msm_cdc_get_gpio_state(struct device_node *np)
 {
 	return 0;