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[v7,1/5] dt-bindings: soc: Add Aspeed XDMA engine

Message ID 20200402194955.16643-2-eajames@linux.ibm.com
State Superseded, archived
Headers show
Series soc: aspeed: Add XDMA engine driver | expand

Commit Message

Eddie James April 2, 2020, 7:49 p.m. UTC
Document the bindings for the Aspeed AST25XX and AST26XX XDMA engine.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Andrew Jeffrey <andrew@aj.id.au>
Reviewed-by: Rob Herring <robh@kernel.org>
---
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
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Patch

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@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