ChromeOS EC Keyboard Google's ChromeOS EC Keyboard is a simple matrix keyboard implemented on a separate EC (Embedded Controller) device. It provides a message for reading key scans from the EC. These are then converted into keycodes for processing by the kernel. This binding is based on matrix-keymap.txt and extends/modifies it as follows: Required properties: - compatible: "google,cros-ec-keyb" Optional properties: - google,needs-ghost-filter: True to enable a ghost filter for the matrix keyboard. This is recommended if the EC does not have its own logic or hardware for this. Example: cros-ec-keyb { compatible = "google,cros-ec-keyb"; keypad,num-rows = <8>; keypad,num-columns = <13>; google,needs-ghost-filter; /* * Keymap entries take the form of 0xRRCCKKKK where * RR=Row CC=Column KKKK=Key Code * The values below are for a US keyboard layout and * are taken from the Linux driver. Note that the * 102ND key is not used for US keyboards. */ linux,keymap = < /* CAPSLCK F1 B F10 */ 0x0001003a 0x0002003b 0x00030030 0x00040044 /* N = R_ALT ESC */ 0x00060031 0x0008000d 0x000a0064 0x01010001 /* F4 G F7 H */ 0x0102003e 0x01030022 0x01040041 0x01060023 /* ' F9 BKSPACE L_CTRL */ 0x01080028 0x01090043 0x010b000e 0x0200001d /* TAB F3 T F6 */ 0x0201000f 0x0202003d 0x02030014 0x02040040 /* ] Y 102ND [ */ 0x0205001b 0x02060015 0x02070056 0x0208001a /* F8 GRAVE F2 5 */ 0x02090042 0x03010029 0x0302003c 0x03030006 /* F5 6 - \ */ 0x0304003f 0x03060007 0x0308000c 0x030b002b /* R_CTRL A D F */ 0x04000061 0x0401001e 0x04020020 0x04030021 /* S K J ; */ 0x0404001f 0x04050025 0x04060024 0x04080027 /* L ENTER Z C */ 0x04090026 0x040b001c 0x0501002c 0x0502002e /* V X , M */ 0x0503002f 0x0504002d 0x05050033 0x05060032 /* L_SHIFT / . SPACE */ 0x0507002a 0x05080035 0x05090034 0x050B0039 /* 1 3 4 2 */ 0x06010002 0x06020004 0x06030005 0x06040003 /* 8 7 0 9 */ 0x06050009 0x06060008 0x0608000b 0x0609000a /* L_ALT DOWN RIGHT Q */ 0x060a0038 0x060b006c 0x060c006a 0x07010010 /* E R W I */ 0x07020012 0x07030013 0x07040011 0x07050017 /* U R_SHIFT P O */ 0x07060016 0x07070036 0x07080019 0x07090018 /* UP LEFT */ 0x070b0067 0x070c0069>; };