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Diffstat (limited to 'zephyr/dts/bindings/keyboard/cros-keyscan.yaml')
-rw-r--r-- | zephyr/dts/bindings/keyboard/cros-keyscan.yaml | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/zephyr/dts/bindings/keyboard/cros-keyscan.yaml b/zephyr/dts/bindings/keyboard/cros-keyscan.yaml new file mode 100644 index 0000000000..11caf7fd11 --- /dev/null +++ b/zephyr/dts/bindings/keyboard/cros-keyscan.yaml @@ -0,0 +1,82 @@ + # Copyright 2021 The Chromium OS Authors. All rights reserved. + # Use of this source code is governed by a BSD-style license that can be + # found in the LICENSE file. + +description: Keyboard scanning properties + +compatible: "cros-keyscan" + +properties: + output-settle: + type: int + required: false + default: 80 + description: | + Delay time, in microseconds, between setting up output and waiting for + it to settle. 80 microseconds is the recommended value when column 2 + of the keyboard passes through the Google Security Chip. Otherwise 50 + microseconds is the recommended value. + + debounce-down: + type: int + required: false + default: 9000 + description: | + Time, in microseconds, to debounce key-down. + + debounce-up: + type: int + required: false + default: 30000 + description: | + Time, in microseconds, to debounce key-up. + + scan-period: + type: int + required: false + default: 3000 + description: | + Time between scans when keyboard scan task runs in polling mode. + + min-post-scan-delay: + type: int + required: false + default: 1000 + description: | + Minimum time between end of one scan and start of the next one. + This ensures keyboard scanning doesn't starve the rest of the system + if the scan period is set too short, or if other higher-priority + system activity is starving the keyboard scan task too. + + poll-timeout: + type: int + required: false + default: 100000 + description: | + Revert to interrupt mode after no keyboard activity for this period. + Specified in microseconds. + + actual-key-mask: + type: array + required: false + default: [ + 0x1c, # C0 + 0xff, # C1 + 0xff, # C2 + 0xff, # C3 + 0xff, # C4 + 0xf5, # C5 + 0xff, # C6 + 0xa4, # C7 + 0xfe, # C8 + 0x55, # C9 + 0xfa, # C10 + 0xff, # C11 + 0xca, # C12 + 0x00, # C13 for keypad + 0x00, # C14 for keypad + ] + description: | + Keyboard scanning mask. For each keyboard column, specify which + keyboard rows actually exist. Default key mask includes scanning for + full Chromebook keyboard, excluding the keypad. |