+ #include <linux/input.h>
+ #include <linux/gpio/machine.h>
+ #include <linux/property.h>
+
+ #define GPIO_ROTARY_A 1
+ #define GPIO_ROTARY_B 2
+
+ static struct gpiod_lookup_table rotary_encoder_gpios = {
+ .dev_id = "rotary-encoder.0",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio-0",
+ GPIO_ROTARY_A, NULL, 0, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("gpio-0",
+ GPIO_ROTARY_B, NULL, 1, GPIO_ACTIVE_HIGH),
+ { },
+ },
+ };
+
+ static const struct property_entry rotary_encoder_properties[] __initconst = {
+ PROPERTY_ENTRY_INTEGER("rotary-encoder,steps-per-period", u32, 24),
+ PROPERTY_ENTRY_INTEGER("linux,axis", u32, ABS_X),
+ PROPERTY_ENTRY_INTEGER("rotary-encoder,relative_axis", u32, 0),
+ { },
+ };
+
+ static struct platform_device rotary_encoder_device = {
+ .name = "rotary-encoder",
+ .id = 0,
+ };
+
+ ...
+
+ gpiod_add_lookup_table(&rotary_encoder_gpios);
+ device_add_properties(&rotary_encoder_device, rotary_encoder_properties);
+ platform_device_register(&rotary_encoder_device);
+
+ ...