[PATCH v8 2/3] MIPS: Loongson64: dts: update the display controller device node
Sui Jingfeng
15330273260 at 189.cn
Wed Feb 16 18:17:11 UTC 2022
From: suijingfeng <suijingfeng at loongson.cn>
The display controller is a pci device, its PCI vendor id is 0x0014
its PCI device id is 0x7a06.
1) In order to let the lsdc kms driver to know which chip the DC is
contained in, we add different compatible for different chip.
2) Add display controller device node for ls2k1000 SoC
Signed-off-by: suijingfeng <suijingfeng at loongson.cn>
Signed-off-by: Sui Jingfeng <15330273260 at 189.cn>
---
.../loongson/loongson,display-controller.yaml | 114 ++++++++++++++++++
.../display/loongson/loongson-drm.txt | 16 +++
.../boot/dts/loongson/loongson64-2k1000.dtsi | 8 ++
arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 7 +-
4 files changed, 140 insertions(+), 5 deletions(-)
create mode 100644 Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
create mode 100644 Documentation/devicetree/bindings/display/loongson/loongson-drm.txt
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..64d8364b50ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/pci0014,7a06.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson LS7A2000/LS7A1000/LS2K1000/LS2K0500 Display Controller Device Tree Bindings
+
+maintainers:
+ - Sui Jingfeng <suijingfeng at 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 ---> | Monotor |
+ | _ _ -------| ^ ^ |_________|
+ | | | | | -------| | |
+ | |_| |_| | 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 ---> | Monotor |
+ | _ _ -------| ^ ^ |_________|
+ | | | | | | | |
+ | |_| |_| | +------+ |
+ | <---->| i2c0 |<---------+
+ | DC IN LS2K1000 | +------+
+ | _ _ | +------+
+ | | | | | <---->| i2c1 |----------+
+ | |_| |_| | +------+ | _________
+ | -------| | | | |
+ | CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> | Panel |
+ | -------| |_________|
+ |___________________|
+
+properties:
+ compatible:
+ enum:
+ - loongson,ls7a2000-dc
+ - loongson,ls7a1000-dc
+ - loongson,ls2k1000-dc
+ - loongson,ls2k0500-dc
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |
+ lsdc: dc at 6,1 {
+ compatible = "loongson,ls7a1000-dc";
+ reg = <0x3100 0x0 0x0 0x0 0x0>;
+ interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-parent = <&pic>;
+ };
+
+...
+
diff --git a/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt b/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt
new file mode 100644
index 000000000000..46417e0e34ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt
@@ -0,0 +1,16 @@
+Loongson display controller
+===========================
+
+Required properties:
+- compatible: Should be "loongson,display-subsystem" or "loongson,ls-fb"
+- reg: should be register base and length
+- interrupts: Should contain the cores interrupt line
+
+example:
+
+lsdc: dc at 0x400c0000 {
+ compatible = "loongson,display-subsystem", "loongson,ls-fb";
+ reg = <0x400c0000 0x00010000>;
+ interrupt-parent = <&icu>;
+ interrupts = <36>;
+};
diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
index 768cf2abcea3..47f6ff4c3e8a 100644
--- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
+++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
@@ -209,6 +209,14 @@ gpu at 5,0 {
interrupt-parent = <&liointc0>;
};
+ lsdc: dc at 6,0 {
+ compatible = "loongson,ls2k1000-dc";
+
+ reg = <0x3000 0x0 0x0 0x0 0x0>;
+ interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
+ interrupt-parent = <&liointc0>;
+ };
+
pci_bridge at 9,0 {
compatible = "pci0014,7a19.0",
"pci0014,7a19",
diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index 2f45fce2cdc4..b34426142453 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
@@ -160,11 +160,8 @@ gpu at 6,0 {
interrupt-parent = <&pic>;
};
- dc at 6,1 {
- compatible = "pci0014,7a06.0",
- "pci0014,7a06",
- "pciclass030000",
- "pciclass0300";
+ lsdc: dc at 6,1 {
+ compatible = "loongson,ls7a1000-dc";
reg = <0x3100 0x0 0x0 0x0 0x0>;
interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;
--
2.25.1
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