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Message-ID: <YjkITWpbnCmhKaX+@robh.at.kernel.org>
Date: Mon, 21 Mar 2022 18:20:45 -0500
From: Rob Herring <robh@...nel.org>
To: Sui Jingfeng <15330273260@....cn>
Cc: Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Roland Scheidegger <sroland@...are.com>,
Zack Rusin <zackr@...are.com>,
Christian Gmeiner <christian.gmeiner@...il.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Dan Carpenter <dan.carpenter@...cle.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
Sam Ravnborg <sam@...nborg.org>,
"David S . Miller" <davem@...emloft.net>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Lucas Stach <l.stach@...gutronix.de>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Ilia Mirkin <imirkin@...m.mit.edu>,
Qing Zhang <zhangqing@...ngson.cn>,
suijingfeng <suijingfeng@...ngson.cn>,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v11 5/7] dt-bindings: display: Add Loongson display
controller
On Tue, Mar 22, 2022 at 12:29:14AM +0800, Sui Jingfeng wrote:
> From: suijingfeng <suijingfeng@...ngson.cn>
>
Needs a commit message.
> Signed-off-by: suijingfeng <suijingfeng@...ngson.cn>
> Signed-off-by: Sui Jingfeng <15330273260@....cn>
Same person? Don't need both emails.
> ---
> .../loongson/loongson,display-controller.yaml | 230 ++++++++++++++++++
> 1 file changed, 230 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..7be63346289e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
> @@ -0,0 +1,230 @@
> +# 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@...ngson.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, 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-gpio@0:
> + description: |
> + Built-in GPIO emulate i2c exported for external display bridge
If you have i2c-gpio, that belongs at the DT top-level, not here.
> + configuration, onitor detection and edid read back etc, for ls7a1000
> + only. Its compatible must be lsdc,i2c-gpio-0. The reg property can be
No, there's a defined i2c-gpio compatible already.
> + used to specify a I2c adapter bus number, if you don't specify one
> + i2c driver core will dynamically assign a bus number. Please specify
Bus numbers are a linux detail not relevant to DT binding.
> + it only when its bus number matters. Bus number greater than 6 is safe
> + because ls7a1000 bridge have 6 hardware I2C controller integrated.
> +
> + i2c-gpio@1:
> + description: |
> + Built-in GPIO emulate i2c exported for external display bridge
> + configuration, onitor detection and edid read back etc, for ls7a1000
> + only. Its compatible must be lsdc,i2c-gpio-1.
> +
> + 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
> + - ports
> +
> +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>;
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + i2c-gpio@0 {
> + compatible = "lsdc,i2c-gpio-0";
> + reg = <6>;
> + sda = <0>;
> + scl = <1>;
> + };
> +
> + i2c-gpio@1 {
> + compatible = "lsdc,i2c-gpio-1";
> + reg = <7>;
> + sda = <2>;
> + scl = <3>;
> + };
> +
> + 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
>
>
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