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1d0b1c74ed
Some matrix keypad drivers can support different numbers of rows and columns. Add a generic binding for these. Implementation note: In order to implement this binding in the kernel, we will need to modify matrix_keypad_() to look up the number of rows and cols in the keymap. Perhaps this could be done by passing 0 for these parameters? Many of the parameters can already be set to NULL. Ick. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
28 lines
1.0 KiB
Plaintext
28 lines
1.0 KiB
Plaintext
A simple common binding for matrix-connected key boards. Currently targeted at
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defining the keys in the scope of linux key codes since that is a stable and
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standardized interface at this time.
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Required properties:
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- linux,keymap: an array of packed 1-cell entries containing the equivalent
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of row, column and linux key-code. The 32-bit big endian cell is packed
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as:
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row << 24 | column << 16 | key-code
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Optional properties:
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Properties for the number of rows and columns are optional because some
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drivers will use fixed values for these.
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- keypad,num-rows: Number of row lines connected to the keypad controller.
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- keypad,num-columns: Number of column lines connected to the keypad
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controller.
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Some users of this binding might choose to specify secondary keymaps for
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cases where there is a modifier key such as a Fn key. Proposed names
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for said properties are "linux,fn-keymap" or with another descriptive
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word for the modifier other from "Fn".
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Example:
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linux,keymap = < 0x00030012
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0x0102003a >;
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keypad,num-rows = <2>;
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keypad,num-columns = <8>;
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