cnss: Add optional property to control wlan_en gpio for Dual-Wifi platforms

The WIFI PCIe Clock is controlled by WLAN_EN gpio.
On Dual-WiFi Platforms, QCA WIFI SDIO chip clock sourced by PCIe Clock.

Turning off WLAN_EN gpio would result in SDIO WIFI Functional Failures.
Control the gpio, based on the platform.

CRs-Fixed: 990796
Change-Id: I1399cd8aa53d1c6fd6b8ff0c5cce66b978770dbd
Signed-off-by: Komal Seelam <kseelam@codeaurora.org>
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>

Documentation/devicetree/bindings/cnss/cnss-wlan.txt

@@ -42,6 +42,8 @@ Optional properties:
   - reg-names: Names of the memory regions defined in reg entry
   - wlan-bootstrap-gpio: WLAN_BOOTSTRAP GPIO signal specified by QCA6174
                          which should be drived depending on platforms
+  - qcom,is-dual-wifi-enabled: Boolean property to control wlan enable(wlan-en)
+                               gpio on dual-wifi platforms.
 
 Example:
 

drivers/net/wireless/cnss/cnss_pci.c

@@ -223,6 +223,10 @@ struct index_file {
 	u8 file_name[13];
 };
 
+struct cnss_dual_wifi {
+	bool is_dual_wifi_enabled;
+};
+
 /**
  * struct wlan_mac_addr - Structure to hold WLAN MAC Address
  * @mac_addr: MAC address
@@ -300,6 +304,7 @@ static struct cnss_data {
 	int wlan_bootstrap_gpio;
 	atomic_t auto_suspended;
 	bool monitor_wake_intr;
+	struct cnss_dual_wifi dual_wifi_info;
 } *penv;
 
 static unsigned int pcie_link_down_panic;
@@ -576,6 +581,11 @@ static void cnss_wlan_gpio_set(struct cnss_wlan_gpio_info *info, bool state)
 		return;
 	}
 
+	if (state == WLAN_EN_LOW && penv->dual_wifi_info.is_dual_wifi_enabled) {
+		pr_debug("%s Dual WiFi enabled\n", __func__);
+		return;
+	}
+
 	gpio_set_value(info->num, state);
 	info->state = state;
 
@@ -2899,6 +2909,9 @@ static int cnss_probe(struct platform_device *pdev)
 
 	penv->subsys_handle = subsystem_get(penv->subsysdesc.name);
 
+	if (of_property_read_bool(dev->of_node, "qcom,is-dual-wifi-enabled"))
+		penv->dual_wifi_info.is_dual_wifi_enabled = true;
+
 	if (of_property_read_u32(dev->of_node, "qcom,wlan-ramdump-dynamic",
 				&ramdump_size) == 0) {
 		penv->ramdump_addr = dma_alloc_coherent(&pdev->dev,