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Message-Id: <f298715ab197ae72ab9b33caee2a19cc3e8be3f5.1600827061.git.mallikarjunax.reddy@linux.intel.com>
Date: Tue, 27 Oct 2020 16:03:06 +0800
From: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@...ux.intel.com>
To: dmaengine@...r.kernel.org, vkoul@...nel.org,
devicetree@...r.kernel.org, robh+dt@...nel.org
Cc: linux-kernel@...r.kernel.org, andriy.shevchenko@...el.com,
chuanhua.lei@...ux.intel.com, cheol.yong.kim@...el.com,
qi-ming.wu@...el.com, mallikarjunax.reddy@...ux.intel.com,
malliamireddy009@...il.com, peter.ujfalusi@...com
Subject: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC
Add DT bindings YAML schema for DMA controller driver
of Lightning Mountain(LGM) SoC.
Signed-off-by: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@...ux.intel.com>
---
v1:
- Initial version.
v2:
- Fix bot errors.
v3:
- No change.
v4:
- Address Thomas langer comments
- use node name pattern as dma-controller as in common binding.
- Remove "_" (underscore) in instance name.
- Remove "port-" and "chan-" in attribute name for both 'dma-ports' & 'dma-channels' child nodes.
v5:
- Moved some of the attributes in 'dma-ports' & 'dma-channels' child nodes to dma client/consumer side as cells in 'dmas' properties.
v6:
- Add additionalProperties: false
- completely removed 'dma-ports' and 'dma-channels' child nodes.
- Moved channel dt properties to client side dmas.
- Use standard dma-channels and dma-channel-mask properties.
- Documented reset-names
- Add description for dma-cells
v7:
- modified compatible to oneof
- Reduced number of dma-cells to 3
- Fine tune the description of some properties.
---
.../devicetree/bindings/dma/intel,ldma.yaml | 135 +++++++++++++++++++++
1 file changed, 135 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/intel,ldma.yaml
diff --git a/Documentation/devicetree/bindings/dma/intel,ldma.yaml b/Documentation/devicetree/bindings/dma/intel,ldma.yaml
new file mode 100644
index 000000000000..d38143932b05
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/intel,ldma.yaml
@@ -0,0 +1,135 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/intel,ldma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lightning Mountain centralized low speed DMA and high speed DMA controllers.
+
+maintainers:
+ - chuanhua.lei@...el.com
+ - mallikarjunax.reddy@...el.com
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ $nodename:
+ pattern: "^dma-controller(@.*)?$"
+
+ compatible:
+ oneOf:
+ - const: intel,lgm-cdma
+ - const: intel,lgm-dma2tx
+ - const: intel,lgm-dma1rx
+ - const: intel,lgm-dma1tx
+ - const: intel,lgm-dma0tx
+ - const: intel,lgm-dma3
+ - const: intel,lgm-toe-dma30
+ - const: intel,lgm-toe-dma31
+
+ reg:
+ maxItems: 1
+
+ "#dma-cells":
+ const: 3
+ description:
+ The first cell is the peripheral's DMA request line.
+ The second cell is the peripheral's (port) number corresponding to the channel.
+ The third cell is the burst length of the channel.
+
+ dma-channels:
+ minimum: 1
+ maximum: 16
+
+ dma-channel-mask:
+ items:
+ minItems: 1
+
+ clocks:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ reset-names:
+ items:
+ - const: ctrl
+
+ interrupts:
+ maxItems: 1
+
+ intel,dma-poll-cnt:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description:
+ DMA descriptor polling counter is used to control the poling mechanism
+ for the descriptor fetching for all channels.
+
+ intel,dma-byte-en:
+ type: boolean
+ description:
+ DMA byte enable is only valid for DMA write(RX).
+ Byte enable(1) means DMA write will be based on the number of dwords
+ instead of the whole burst.
+
+ intel,dma-drb:
+ type: boolean
+ description:
+ DMA descriptor read back to make sure data and desc synchronization.
+
+ intel,dma-desc-in-sram:
+ type: boolean
+ description:
+ DMA descritpors in SRAM or not. Some old controllers descriptors
+ can be in DRAM or SRAM. The new ones are all in SRAM.
+
+ intel,dma-orrc:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description:
+ DMA outstanding read counter value determine the number of
+ ORR-Outstanding Read Request. The maximum value is 16.
+
+ intel,dma-dburst-wr:
+ type: boolean
+ description:
+ Enable RX dynamic burst write. When it is enabled, the DMA does RX dynamic burst;
+ if it is disabled, the DMA RX will still support programmable fixed burst size of 2,4,8,16.
+ It only applies to RX DMA and memcopy DMA.
+
+required:
+ - compatible
+ - reg
+ - '#dma-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ dma0: dma-controller@...00000 {
+ compatible = "intel,lgm-cdma";
+ reg = <0xe0e00000 0x1000>;
+ #dma-cells = <3>;
+ dma-channels = <16>;
+ dma-channel-mask = <0xFFFF>;
+ interrupt-parent = <&ioapic1>;
+ interrupts = <82 1>;
+ resets = <&rcu0 0x30 0>;
+ reset-names = "ctrl";
+ clocks = <&cgu0 80>;
+ intel,dma-poll-cnt = <4>;
+ intel,dma-byte-en;
+ intel,dma-drb;
+ };
+ - |
+ dma3: dma-controller@...00000 {
+ compatible = "intel,lgm-dma3";
+ reg = <0xec800000 0x1000>;
+ clocks = <&cgu0 71>;
+ resets = <&rcu0 0x10 9>;
+ #dma-cells = <3>;
+ intel,dma-poll-cnt = <16>;
+ intel,dma-desc-in-sram;
+ intel,dma-orrc = <16>;
+ intel,dma-byte-en;
+ intel,dma-dburst-wr;
+ };
--
2.11.0
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