Messages in this thread | | | Date | Sun, 20 Feb 2022 18:22:49 +0000 | Subject | Re: [PATCH v10 2/4] Documentation/dt: Add descriptions for loongson display controller | From | Jiaxun Yang <> |
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在 2022/2/20 14:55, Sui Jingfeng 写道: > From: suijingfeng <suijingfeng@loongson.cn> > > Add DT documentation for loongson display controller found in LS2K1000, > LS2K0500 and LS7A1000. > > v2: DT binding docs and includes should be a separate patch, > fix a warnning because of that. > > v3: split dt-bindings from other changes into a separate patch. > > v4: fix warnings and errors when running make dt_binding_check > > Reported-by: Rob Herring <robh@kernel.org> > Reported-by: Krzysztof Kozlowski <krzk@kernel.org> > Signed-off-by: suijingfeng <suijingfeng@loongson.cn> > Signed-off-by: Sui Jingfeng <15330273260@189.cn> > --- > .../loongson/loongson,display-controller.yaml | 122 ++++++++++++++++++ > 1 file changed, 122 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..ee1a59b91943 > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml > @@ -0,0 +1,122 @@ > +# 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@loongson.cn> > + > +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. > + > + 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 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. > + > + 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: > + enum: > + - loongson,ls7a1000-dc > + - loongson,ls2k1000-dc > + - loongson,ls2k0500-dc > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + > +required: > + - compatible > + - reg > + - interrupts > + > +additionalProperties: false Given that it is possible to have output subnodes I guess additionalProperties should be allowed?
Thanks. - Jiaxun > + > +examples: > + - | > + #include <dt-bindings/interrupt-controller/irq.h> > + bus { > + > + #address-cells = <3>; > + #size-cells = <2>; > + #interrupt-cells = <2>; > + > + lsdc: display-controller@6,1 { > + compatible = "loongson,ls7a1000-dc"; > + reg = <0x3100 0x0 0x0 0x0 0x0>; > + interrupts = <28 IRQ_TYPE_LEVEL_HIGH>; > + interrupt-parent = <&pic>; > + }; > + }; > +...
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