diff options
Diffstat (limited to 'dts/Bindings/dma/ingenic,dma.yaml')
| -rw-r--r-- | dts/Bindings/dma/ingenic,dma.yaml | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/dts/Bindings/dma/ingenic,dma.yaml b/dts/Bindings/dma/ingenic,dma.yaml index ac4d59494f..d9cca3006e 100644 --- a/dts/Bindings/dma/ingenic,dma.yaml +++ b/dts/Bindings/dma/ingenic,dma.yaml @@ -4,25 +4,34 @@ $id: http://devicetree.org/schemas/dma/ingenic,dma.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# -title: Ingenic SoCs DMA Controller DT bindings +title: Ingenic SoCs DMA Controller maintainers: - Paul Cercueil <paul@crapouillou.net> allOf: - - $ref: "dma-controller.yaml#" + - $ref: dma-controller.yaml# properties: compatible: - enum: - - ingenic,jz4740-dma - - ingenic,jz4725b-dma - - ingenic,jz4760-dma - - ingenic,jz4760b-dma - - ingenic,jz4770-dma - - ingenic,jz4780-dma - - ingenic,x1000-dma - - ingenic,x1830-dma + oneOf: + - enum: + - ingenic,jz4740-dma + - ingenic,jz4725b-dma + - ingenic,jz4755-dma + - ingenic,jz4760-dma + - ingenic,jz4760-bdma + - ingenic,jz4760-mdma + - ingenic,jz4760b-dma + - ingenic,jz4760b-bdma + - ingenic,jz4760b-mdma + - ingenic,jz4770-dma + - ingenic,jz4780-dma + - ingenic,x1000-dma + - ingenic,x1830-dma + - items: + - const: ingenic,jz4770-bdma + - const: ingenic,jz4760b-bdma reg: items: @@ -36,13 +45,19 @@ properties: maxItems: 1 "#dma-cells": - const: 2 + enum: [2, 3] description: > DMA clients must use the format described in dma.txt, giving a phandle - to the DMA controller plus the following 2 integer cells: + to the DMA controller plus the following integer cells: - - Request type: The DMA request type for transfers to/from the - device on the allocated channel, as defined in the SoC documentation. + - Request type: The DMA request type specifies the device endpoint that + will be the source or destination of the DMA transfer. + If "#dma-cells" is 2, the request type is a single cell, and the + direction will be unidirectional (either RX or TX but not both). + If "#dma-cells" is 3, the request type has two cells; the first + one corresponds to the host to device direction (TX), the second one + corresponds to the device to host direction (RX). The DMA channel is + then bidirectional. - Channel: If set to 0xffffffff, any available channel will be allocated for the client. Otherwise, the exact channel specified will be used. @@ -53,7 +68,7 @@ properties: $ref: /schemas/types.yaml#/definitions/uint32 description: > Bitmask of channels to reserve for devices that need a specific - channel. These channels will only be assigned when explicitely + channel. These channels will only be assigned when explicitly requested by a client. The primary use for this is channels 0 and 1, which can be configured to have special behaviour for NAND/BCH when using programmable firmware. @@ -68,7 +83,7 @@ unevaluatedProperties: false examples: - | - #include <dt-bindings/clock/jz4780-cgu.h> + #include <dt-bindings/clock/ingenic,jz4780-cgu.h> dma: dma-controller@13420000 { compatible = "ingenic,jz4780-dma"; reg = <0x13420000 0x400>, <0x13421000 0x40>; |