[U-Boot] [PATCH] drivers: serial: probe all serial devices

[Vabhav Sharma]

Serial subsystem search and probe only one first serial
device and unable to use remaining available UART devices

This patch changes the logic to probe all available serial devices
using platform data or device tree in DM model in order to use all
UART devices

Signed-off-by: Vabhav Sharma <vabhav.sharma at nxp.com>
---
 drivers/serial/Kconfig         | 12 ++++++++++++
 drivers/serial/serial-uclass.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 597db4b..d6451b1 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -133,6 +133,18 @@ config SERIAL_SEARCH_ALL
 
 	  If unsure, say N.
 
+config SERIAL_PROBE_ALL
+	bool "Probe all available serial devices"
+	depends on DM_SERIAL
+	help
+	 The serial subsystem only probe for single serial device, but does
+	 not probe for remaining available devices.
+	 With this option set,we make probing for all available devices
+	 mandatory.
+
+	 If probing is not required for all remaining available
+	 devices other than default current console device, say N.
+
 config SPL_DM_SERIAL
 	bool "Enable Driver Model for serial drivers in SPL"
 	depends on DM_SERIAL && SPL_DM
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c
index e50f0aa..405e60e 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -82,6 +82,13 @@ static void serial_find_console_or_panic(void)
 		uclass_first_device(UCLASS_SERIAL, &dev);
 		if (dev) {
 			gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+			/* Scanning uclass to probe all devices */
+			for (;
+			     dev;
+			     uclass_next_device(&dev))
+				;
+#endif
 			return;
 		}
 	} else if (CONFIG_IS_ENABLED(OF_CONTROL) && blob) {
@@ -92,11 +99,25 @@ static void serial_find_console_or_panic(void)
 			if (np && !uclass_get_device_by_ofnode(UCLASS_SERIAL,
 					np_to_ofnode(np), &dev)) {
 				gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+				/* Scanning uclass to probe all devices */
+				for (;
+				     dev;
+				     uclass_next_device(&dev))
+					;
+#endif
 				return;
 			}
 		} else {
 			if (!serial_check_stdout(blob, &dev)) {
 				gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+				/* Scanning uclass to probe all devices */
+				for (;
+				     dev;
+				     uclass_next_device(&dev))
+					;
+#endif
 				return;
 			}
 		}
@@ -121,6 +142,13 @@ static void serial_find_console_or_panic(void)
 		    !uclass_get_device(UCLASS_SERIAL, INDEX, &dev)) {
 			if (dev->flags & DM_FLAG_ACTIVATED) {
 				gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+				/* Scanning uclass to probe all devices */
+				for (;
+				     dev;
+				     uclass_next_device(&dev))
+					;
+#endif
 				return;
 			}
 		}
@@ -132,6 +160,13 @@ static void serial_find_console_or_panic(void)
 			if (!ret) {
 				/* Device did succeed probing */
 				gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+				/* Scanning uclass to probe all devices */
+				for (;
+				     dev;
+				     uclass_next_device(&dev))
+					;
+#endif
 				return;
 			}
 		}
@@ -140,6 +175,13 @@ static void serial_find_console_or_panic(void)
 		    !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) ||
 		    (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) {
 			gd->cur_serial_dev = dev;
+#ifdef CONFIG_SERIAL_PROBE_ALL
+			/* Scanning uclass to probe all devices */
+			for (;
+			     dev;
+			     uclass_next_device(&dev))
+				;
+#endif
 			return;
 		}
 #endif
-- 
2.7.4