common: Add autoenable for components

common/Kconfig +8 -0

 endchoice
 
+config KERNEL_AUTOENABLE
+	bool
+	prompt "Autoenable of components"
+	help
+	  Say Y to unlock an API for automatically enable either hardware
+	  components with existing device drivers or i2c clients. All functions
+	  take a device tree path to find the hardware and will fix up the node
+	  status in the kernel device tree, if it's accessible.

common/Kconfig +1 -0

+
 choice
 	prompt "Console activation strategy"
 	depends on CONSOLE_FULL

common/Makefile +1 -0

index 8cd0ab3..4d7b0f9 100644
@@ -31,6 +31,7 @@ obj-$(CONFIG_FLEXIBLE_BOOTARGS)	+= bootargs.o
 obj-$(CONFIG_GLOBALVAR)		+= globalvar.o
 obj-$(CONFIG_GREGORIAN_CALENDER) += date.o
 obj-$(CONFIG_KALLSYMS)		+= kallsyms.o
+obj-$(CONFIG_KERNEL_AUTOENABLE) += autoenable.o
 obj-$(CONFIG_MALLOC_DLMALLOC)	+= dlmalloc.o
 obj-$(CONFIG_MALLOC_TLSF)	+= tlsf_malloc.o tlsf.o
 obj-$(CONFIG_MALLOC_DUMMY)	+= dummy_malloc.o

common/autoenable.c +0 -0

common/autoenable.c new file +10 -0

+/**
+ * autoenable_device_by_path() - Autoenable a device by a device tree path
+ * @param path Device tree path up from the root to the device
+ * @return 0 on success, -enodev on failure. If no device found in the device
+ * tree.
+ *
+ * This function will search for a device and will enable it in the kernel
+ * device tree, if it exists and is loaded.
+ */
+int autoenable_device_by_path(char *path)

common/autoenable.c new file +10 -0

+
+	device = of_find_device_by_node(node);
+	if (!device)
+		return -ENODEV;
+
+	ret = of_register_set_status_fixup(path, 1);
+	if (!ret)
+		printf("autoenabled %s\n", device->name);
+	return ret;
+}

common/autoenable.c new file +12 -0

+
+/**
+ * autoenable_i2c_by_path - Autoenable a i2c client by a device tree path
+ * @param path Device tree path up from the root to the i2c client
+ * @return 0 on success, -enodev on failure. If no i2c client found in the i2c
+ * device tree.
+ *
+ * This function will search for a i2c client, tries to write to the client and
+ * will enable it in the kernel device tree, if it exists and is accessible.
+ */
+int autoenable_i2c_by_path(char *path)
+{

common/autoenable.c new file +10 -0

+		node = of_find_node_by_path(path);
+	if (!node)
+		return -ENODEV;
+	if (!node->parent)
+		return -ENODEV;
+
+	ip = of_get_property(node, "reg", NULL);
+	if (!ip)
+		return -ENODEV;
+	addr = be32_to_cpup(ip);