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Diffstat (limited to 'dts/Bindings/display/panel/panel-timing.yaml')
| -rw-r--r-- | dts/Bindings/display/panel/panel-timing.yaml | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/dts/Bindings/display/panel/panel-timing.yaml b/dts/Bindings/display/panel/panel-timing.yaml new file mode 100644 index 0000000000..aea69b84ca --- /dev/null +++ b/dts/Bindings/display/panel/panel-timing.yaml @@ -0,0 +1,214 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/panel/panel-timing.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: panel timing + +maintainers: + - Thierry Reding <thierry.reding@gmail.com> + - Sam Ravnborg <sam@ravnborg.org> + +description: | + There are different ways of describing the timing data of a panel. The + devicetree representation corresponds to the one commonly found in datasheets + for panels. + + The parameters are defined as seen in the following illustration. + + +-------+----------+-------------------------------------+----------+ + | | | ^ | | + | | | |vsync_len | | + | | | v | | + +-------+----------+-------------------------------------+----------+ + | | | ^ | | + | | | |vback_porch | | + | | | v | | + +-------+----------#######################################----------+ + | | # ^ # | + | | # | # | + | hsync | hback # | # hfront | + | len | porch # | hactive # porch | + |<----->|<-------->#<-------+--------------------------->#<-------->| + | | # | # | + | | # |vactive # | + | | # | # | + | | # v # | + +-------+----------#######################################----------+ + | | | ^ | | + | | | |vfront_porch | | + | | | v | | + +-------+----------+-------------------------------------+----------+ + + + The following is the panel timings shown with time on the x-axis. + This matches the timing diagrams often found in data sheets. + + Active Front Sync Back + Region Porch Porch + <-----------------------><----------------><-------------><--------------> + //////////////////////| + ////////////////////// | + ////////////////////// |.................. ................ + _______________ + + Timing can be specified either as a typical value or as a tuple + of min, typ, max values. + +properties: + + clock-frequency: + description: Panel clock in Hz + + hactive: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Horizontal panel resolution in pixels + + vactive: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Vertical panel resolution in pixels + + hfront-porch: + description: Horizontal front porch panel timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of pixels + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of pixels + + hback-porch: + description: Horizontal back porch timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of pixels + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of pixels + + hsync-len: + description: Horizontal sync length panel timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of pixels + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of pixels + + vfront-porch: + description: Vertical front porch panel timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of lines + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of lines + + vback-porch: + description: Vertical back porch panel timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of lines + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of lines + + vsync-len: + description: Vertical sync length panel timing + $ref: /schemas/types.yaml#/definitions/uint32-array + oneOf: + - maxItems: 1 + items: + description: typical number of lines + - minItems: 3 + maxItems: 3 + items: + description: min, typ, max number of lines + + hsync-active: + description: | + Horizontal sync pulse. + 0 selects active low, 1 selects active high. + If omitted then it is not used by the hardware + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + vsync-active: + description: | + Vertical sync pulse. + 0 selects active low, 1 selects active high. + If omitted then it is not used by the hardware + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + de-active: + description: | + Data enable. + 0 selects active low, 1 selects active high. + If omitted then it is not used by the hardware + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + pixelclk-active: + description: | + Data driving on rising or falling edge. + Use 0 to drive pixel data on falling edge and + sample data on rising edge. + Use 1 to drive pixel data on rising edge and + sample data on falling edge + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + syncclk-active: + description: | + Drive sync on rising or sample sync on falling edge. + If not specified then the setup is as specified by pixelclk-active. + Use 0 to drive sync on falling edge and + sample sync on rising edge of pixel clock. + Use 1 to drive sync on rising edge and + sample sync on falling edge of pixel clock + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + interlaced: + type: boolean + description: Enable interlaced mode + + doublescan: + type: boolean + description: Enable double scan mode + + doubleclk: + type: boolean + description: Enable double clock mode + +required: + - clock-frequency + - hactive + - vactive + - hfront-porch + - hback-porch + - hsync-len + - vfront-porch + - vback-porch + - vsync-len + +additionalProperties: false + +... |