shell: add function to get device by name or label

Added shell_device_get_binding() that wraps device_get_binding() plus
device_get_by_dt_nodelabel() so that a shell can easily get a device by
its full name or label.

Signed-off-by: Yishai Jaffe <yishai1999@gmail.com>

include/zephyr/shell/shell.h

@@ -159,6 +159,28 @@ typedef bool (*shell_device_filter_t)(const struct device *dev);
 const struct device *shell_device_filter(size_t idx,
 					 shell_device_filter_t filter);
 
+/**
+ * @brief Get a @ref device reference from its @ref device.name field or label.
+ *
+ * This function iterates through the devices on the system. If a device with
+ * the given @p name field is found, and that device initialized successfully at
+ * boot time, this function returns a pointer to the device.
+ *
+ * If no device has the given @p name, this function returns `NULL`.
+ *
+ * This function also returns NULL when a device is found, but it failed to
+ * initialize successfully at boot time. (To troubleshoot this case, set a
+ * breakpoint on your device driver's initialization function.)
+ *
+ * @param name device name to search for. A null pointer, or a pointer to an
+ * empty string, will cause NULL to be returned.
+ *
+ * @return pointer to device structure with the given name; `NULL` if the device
+ * is not found or if the device with that name's initialization function
+ * failed.
+ */
+const struct device *shell_device_get_binding(const char *name);
+
 /**
  * @brief Shell command handler prototype.
  *

subsys/shell/Kconfig

@@ -25,6 +25,11 @@ config SHELL_MINIMAL
 	  defaults which favor reduced flash or memory requirements over extra
 	  features.
 
+config SHELL_DEVICE_HELPERS
+	bool "Shell device helpers"
+	imply DEVICE_DT_METADATA
+	default y if !SHELL_MINIMAL
+
 config SHELL_THREAD_PRIORITY_OVERRIDE
 	bool "Override default shell thread priority"
 	help

subsys/shell/shell_utils.c

@@ -536,6 +536,17 @@ const struct device *shell_device_lookup(size_t idx,
 	return shell_device_internal(idx, prefix, NULL);
 }
 
+const struct device *shell_device_get_binding(const char *name)
+{
+	const struct device *dev = device_get_binding(name);
+
+	if (IS_ENABLED(CONFIG_DEVICE_DT_METADATA) && dev == NULL) {
+		dev = device_get_by_dt_nodelabel(name);
+	}
+
+	return dev;
+}
+
 long shell_strtol(const char *str, int base, int *err)
 {
 	long val;