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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/spi/spi-pl022.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ARM PL022 SPI controller
maintainers:
- Linus Walleij <linus.walleij@linaro.org>
allOf:
- $ref: "spi-controller.yaml#"
# We need a select here so we don't match all nodes with 'arm,primecell'
select:
properties:
compatible:
contains:
const: arm,pl022
required:
- compatible
properties:
compatible:
items:
- const: arm,pl022
- const: arm,primecell
reg:
maxItems: 1
interrupts:
maxItems: 1
clocks:
maxItems: 2
clock-names:
items:
- enum:
- SSPCLK
- sspclk
- const: apb_pclk
pl022,autosuspend-delay:
description: delay in ms following transfer completion before the
runtime power management system suspends the device. A setting of 0
indicates no delay and the device will be suspended immediately.
$ref: "/schemas/types.yaml#/definitions/uint32"
pl022,rt:
description: indicates the controller should run the message pump with realtime
priority to minimise the transfer latency on the bus (boolean)
type: boolean
dmas:
description:
Two or more DMA channel specifiers following the convention outlined
in bindings/dma/dma.txt
minItems: 2
maxItems: 32
dma-names:
description:
There must be at least one channel named "tx" for transmit and named "rx"
for receive.
minItems: 2
maxItems: 32
additionalItems: true
items:
- const: rx
- const: tx
patternProperties:
"^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
type: object
# SPI slave nodes must be children of the SPI master node and can
# contain the following properties.
properties:
pl022,interface:
description: SPI interface type
$ref: "/schemas/types.yaml#/definitions/uint32"
enum:
- 0 # SPI
- 1 # Texas Instruments Synchronous Serial Frame Format
- 2 # Microwire (Half Duplex)
pl022,com-mode:
description: Specifies the transfer mode
$ref: "/schemas/types.yaml#/definitions/uint32"
enum:
- 0 # interrupt mode
- 1 # polling mode
- 2 # DMA mode
default: 1
pl022,rx-level-trig:
description: Rx FIFO watermark level
$ref: "/schemas/types.yaml#/definitions/uint32"
minimum: 0
maximum: 4
pl022,tx-level-trig:
description: Tx FIFO watermark level
$ref: "/schemas/types.yaml#/definitions/uint32"
minimum: 0
maximum: 4
pl022,ctrl-len:
description: Microwire interface - Control length
$ref: "/schemas/types.yaml#/definitions/uint32"
minimum: 0x03
maximum: 0x1f
pl022,wait-state:
description: Microwire interface - Wait state
$ref: "/schemas/types.yaml#/definitions/uint32"
enum: [0, 1]
pl022,duplex:
description: Microwire interface - Full/Half duplex
$ref: "/schemas/types.yaml#/definitions/uint32"
enum: [0, 1]
required:
- compatible
- reg
- interrupts
unevaluatedProperties: false
examples:
- |
spi@e0100000 {
compatible = "arm,pl022", "arm,primecell";
reg = <0xe0100000 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
interrupts = <0 31 0x4>;
dmas = <&dma_controller 23 1>,
<&dma_controller 24 0>;
dma-names = "rx", "tx";
m25p80@1 {
compatible = "st,m25p80";
reg = <1>;
spi-max-frequency = <12000000>;
spi-cpol;
spi-cpha;
pl022,interface = <0>;
pl022,com-mode = <0x2>;
pl022,rx-level-trig = <0>;
pl022,tx-level-trig = <0>;
pl022,ctrl-len = <0x11>;
pl022,wait-state = <0>;
pl022,duplex = <0>;
};
};
...
|
