Document the bindings for the Aspeed AST25XX and AST26XX XDMA engine.
Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx>
Reviewed-by: Andrew Jeffrey <andrew@xxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
Changes since v6:
- Add PCI-E root complex reset documentation
- Add reset-names documentation
- Switch to memory-region phandle instead of memory regs
.../devicetree/bindings/soc/aspeed/xdma.txt | 44 +++++++++++++++++++
MAINTAINERS | 6 +++
2 files changed, 50 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/aspeed/xdma.txt
diff --git a/Documentation/devicetree/bindings/soc/aspeed/xdma.txt b/Documentation/devicetree/bindings/soc/aspeed/xdma.txt
new file mode 100644
index 000000000000..c3d7cdeb1db6
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/aspeed/xdma.txt
@@ -0,0 +1,44 @@
+Aspeed AST25XX and AST26XX XDMA Engine
+
+The XDMA Engine embedded in the AST2500 and AST2600 SOCs can perform automatic
+DMA operations over PCI between the SOC (acting as a BMC) and a host processor.
+
+Required properties:
+ - compatible : must be "aspeed,ast2500-xdma" or
+ "aspeed,ast2600-xdma"
+ - reg : contains the address and size of the memory region
+ associated with the XDMA engine registers
+ - clocks : clock specifier for the clock associated with the
+ XDMA engine
+ - resets : reset specifier for the syscon reset associated with
+ the XDMA engine, and, for the AST2600, a second reset
+ associated with the PCI-E root complex
+ - reset-names : required only for the AST2600; must be "dev, "rc"
+ - interrupts-extended : two interrupt cells; the first specifies the global
+ interrupt for the XDMA engine and the second
+ specifies the PCI-E reset or PERST interrupt.
+ - aspeed,scu : a phandle to the syscon node for the system control
+ unit of the SOC
+ - memory-region : a phandle to the reserved memory region to be used by
+ the XDMA engine for DMA operations
+
+Optional properties:
+ - pcie-device : should be either "bmc" or "vga", corresponding to
+ which device should be used by the XDMA engine for
+ DMA operations. If this property is not set, the XDMA
+ engine will use the BMC PCI-E device.
+
+Example:
+
+ xdma@1e6e7000 {
+ compatible = "aspeed,ast2600-xdma";
+ reg = <0x1e6e7000 0x100>;
+ clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
+ resets = <&syscon ASPEED_RESET_DEV_XDMA>, <&syscon ASPEED_RESET_RC_XDMA>;
+ reset-names = "dev", "rc";
+ interrupts-extended = <&gic GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
+ <&scu_ic0 ASPEED_AST2600_SCU_IC0_PCIE_PERST_LO_TO_HI>;
+ aspeed,scu = <&syscon>;
+ pcie-device = "bmc";
+ memory-region = <&vga_memory>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 2fd88eeffed5..619a2d559ce2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2771,6 +2771,12 @@ S: Maintained
F: drivers/media/platform/aspeed-video.c
F: Documentation/devicetree/bindings/media/aspeed-video.txt
+ASPEED XDMA ENGINE DRIVER
+M: Eddie James <eajames@xxxxxxxxxxxxx>
+L: linux-aspeed@xxxxxxxxxxxxxxxx (moderated for non-subscribers)
+S: Maintained
+F: Documentation/devicetree/bindings/soc/aspeed/xdma.txt
+
ASUS NOTEBOOKS AND EEEPC ACPI/WMI EXTRAS DRIVERS
M: Corentin Chary <corentin.chary@xxxxxxxxx>
L: acpi4asus-user@xxxxxxxxxxxxxxxxxxxxx
--
2.24.0
