Add DT bindings and simple usages for Loongson display controller found in LS7A1000 bridge chip and LS2k1000 SoC. Signed-off-by: Sui Jingfeng <15330273260@xxxxxx> --- .../loongson/loongson,display-controller.yaml | 295 ++++++++++++++++++ 1 file changed, 295 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml diff --git a/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml new file mode 100644 index 000000000000..61f317d006ef --- /dev/null +++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml @@ -0,0 +1,295 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/loongson/loongson,display-controller.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Loongson LS7A1000/LS2K1000/LS2K0500 Display Controller Device Tree Bindings + +maintainers: + - Sui Jingfeng <suijingfeng@xxxxxxxxxxx> + +description: |+ + + Loongson display controllers are simple which require scanout buffers + to be physically contiguous. LS2K1000/LS2K0500 is a SOC, only system + memory is available. LS7A1000/LS7A2000 is bridge chip which is equipped + with a dedicated video RAM which is 64MB or more, precise size can be + read from the PCI BAR 2 of the GPU device(0x0014:0x7A15) in the bridge + chip. + + LSDC has two display pipes, each way has a DVO interface which provide + RGB888 signals, vertical & horizontal synchronisations, data enable and + the pixel clock. LSDC has two CRTC, each CRTC is able to scanout from + 1920x1080 resolution at 60Hz. Each CRTC has two FB address registers. + + For LS7A1000, there are 4 dedicated GPIOs whose control register is + located at the DC register space. They are used to emulate two way i2c, + One for DVO0, another for DVO1. + + LS2K1000 and LS2K0500 SoC grab i2c adapter from other module, either + general purpose GPIO emulated i2c or hardware i2c in the SoC. + + LSDC's display pipeline have several components as below description, + + The display controller in LS7A1000: + ___________________ _________ + | -------| | | + | CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monitor | + | _ _ -------| ^ ^ |_________| + | | | | | -------| | | + | |_| |_| | i2c0 <--------+-------------+ + | -------| + | DC IN LS7A1000 | + | _ _ -------| + | | | | | | i2c1 <--------+-------------+ + | |_| |_| -------| | | _________ + | -------| | | | | + | CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> | Panel | + | -------| |_________| + |___________________| + + Simple usage of LS7A1000 with LS3A4000 CPU: + + +------+ +------------------------------------+ + | DDR4 | | +-------------------+ | + +------+ | | PCIe Root complex | LS7A1000 | + || MC0 | +--++---------++----+ | + +----------+ HT 3.0 | || || | + | LS3A4000 |<-------->| +---++---+ +--++--+ +---------+ +------+ + | CPU |<-------->| | GC1000 | | LSDC |<--->| DDR3 MC |<->| VRAM | + +----------+ | +--------+ +-+--+-+ +---------+ +------+ + || MC1 +---------------|--|-----------------+ + +------+ | | + | DDR4 | +-------+ DVO0 | | DVO1 +------+ + +------+ VGA <--|ADV7125|<--------+ +-------->|TFP410|--> DVI/HDMI + +-------+ +------+ + + The display controller in LS2K1000/LS2K0500: + ___________________ _________ + | -------| | | + | CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monitor | + | _ _ -------| ^ ^ |_________| + | | | | | | | | + | |_| |_| | +------+ | + | <---->| i2c0 |<---------+ + | DC IN LS2K1000 | +------+ + | _ _ | +------+ + | | | | | <---->| i2c1 |----------+ + | |_| |_| | +------+ | _________ + | -------| | | | | + | CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> | Panel | + | -------| |_________| + |___________________| + +properties: + $nodename: + pattern: "^display-controller@[0-9a-f],[0-9a-f]$" + + compatible: + oneOf: + - items: + - enum: + - loongson,ls7a1000-dc + - loongson,ls2k1000-dc + - loongson,ls2k0500-dc + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + i2c@6: + $ref: /schemas/i2c/i2c-controller.yaml# + description: | + Built-in GPIO emulate i2c exported for display bridge configuration, + monitor detection and edid read back etc, for ls7a1000 only. + + properties: + $nodename: + const: i2c + + compatible: + const: loongson,gpio-i2c + + reg: + minItems: 1 + description: address offset and range + + loongson,sda: + $ref: /schemas/types.yaml#/definitions/uint32 + description: gpio pin used for the sda signal + + loongson,scl: + $ref: /schemas/types.yaml#/definitions/uint32 + description: gpio pin used for the scl signal + + required: + - compatible + - loongson,sda + - loongson,scl + + i2c@7: + $ref: /schemas/i2c/i2c-controller.yaml# + description: | + Built-in GPIO emulate i2c exported for display bridge configuration, + monitor detection and edid read back etc, for ls7a1000 only. + properties: + $nodename: + const: i2c + + compatible: + const: loongson,gpio-i2c + + reg: + minItems: 1 + description: address offset and range + + loongson,sda: + $ref: /schemas/types.yaml#/definitions/uint32 + description: gpio pin used for the sda signal + + loongson,scl: + $ref: /schemas/types.yaml#/definitions/uint32 + description: gpio pin used for the scl signal + + required: + - compatible + - loongson,sda + - loongson,scl + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: output port node connected with DPI panels or external encoders, with only one endpoint. + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: output port node connected with DPI panels or external encoders, with only one endpoint. + + required: + - port@0 + - port@1 + +required: + - compatible + - reg + - interrupts + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + bus { + + #address-cells = <3>; + #size-cells = <2>; + #interrupt-cells = <2>; + + display-controller@6,1 { + compatible = "loongson,ls7a1000-dc"; + reg = <0x3100 0x0 0x0 0x0 0x0>; + interrupts = <28 IRQ_TYPE_LEVEL_HIGH>; + }; + }; + + - | + #include <dt-bindings/interrupt-controller/irq.h> + bus { + + #address-cells = <3>; + #size-cells = <2>; + #interrupt-cells = <2>; + + display-controller@6,1 { + compatible = "loongson,ls7a1000-dc"; + reg = <0x3100 0x0 0x0 0x0 0x0>; + interrupts = <28 IRQ_TYPE_LEVEL_HIGH>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@6 { + compatible = "loongson,gpio-i2c"; + reg = <0x00001650 0x00000020>; + loongson,nr = <6>; + loongson,sda = <0>; + loongson,scl = <1>; + loongson,udelay = <5>; + loongson,timeout = <2200>; + }; + + i2c@7 { + compatible = "loongson,gpio-i2c"; + reg = <0x00001650 0x00000020>; + loongson,nr = <7>; + loongson,sda = <2>; + loongson,scl = <3>; + loongson,udelay = <5>; + loongson,timeout = <2200>; + }; + + ports { + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + endpoint { + remote-endpoint = <&vga_encoder_in>; + }; + }; + + port@1 { + reg = <1>; + endpoint { + remote-endpoint = <&dvi_encoder_in>; + }; + }; + }; + }; + }; + + - | + #include <dt-bindings/interrupt-controller/irq.h> + bus { + + #address-cells = <3>; + #size-cells = <2>; + #interrupt-cells = <2>; + + display-controller@6,0 { + compatible = "loongson,ls2k1000-dc"; + reg = <0x3100 0x0 0x0 0x0 0x0>; + interrupts = <28 IRQ_TYPE_LEVEL_HIGH>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + endpoint { + remote-endpoint = <&panel_in>; + }; + }; + + port@1 { + reg = <1>; + endpoint { + remote-endpoint = <&hdmi_encoder_in>; + }; + }; + }; + }; + }; +... -- 2.25.1
