[PATCH v6 05/12] dt-bindings: soc: Add Aspeed XDMA Engine

Eddie James
2020-01-15T21:30:22Z

Document the bindings for the Aspeed AST25XX and AST26XX XDMA engine.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
.../devicetree/bindings/soc/aspeed/xdma.txt | 40 ++++++++++++++++++++++
MAINTAINERS | 6 ++++
2 files changed, 46 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 0000000..074bda5
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/aspeed/xdma.txt
@@ -0,0 +1,40 @@
+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
+ - 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 : contains the address and size of the memory area 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,ast2500-xdma";
+ reg = <0x1e6e7000 0x100>;
+ clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
+ resets = <&syscon ASPEED_RESET_XDMA>;
+ interrupts-extended = <&vic 6>, <&scu_ic ASPEED_AST2500_SCU_IC_PCIE_RESET_LO_TO_HI>;
+ aspeed,scu = <&syscon>;
+ pcie-device = "bmc";
+ memory = <0x9f000000 0x01000000>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 75057ab..48d0ffd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2744,6 +2744,12 @@ 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@linux.ibm.com>
+L: linux-aspeed@lists.ozlabs.org (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@gmail.com>
L: acpi4asus-user@lists.sourceforge.net
--
1.8.3.1