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spi: pic32: Add bindings for PIC32 SPI peripheral

Document the devicetree bindings for the SPI peripheral found
on Microchip PIC32 class devices.

Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Purna Chandra Mandal 2016-04-01 16:48:49 +05:30 committed by Mark Brown
parent f55532a0c0
commit 120e8989eb
1 changed files with 34 additions and 0 deletions

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Microchip PIC32 SPI Master controller
Required properties:
- compatible: Should be "microchip,pic32mzda-spi".
- reg: Address and length of register space for the device.
- interrupts: Should contain all three spi interrupts in sequence
of <fault-irq>, <receive-irq>, <transmit-irq>.
- interrupt-names: Should be "fault", "rx", "tx" in order.
- clocks: Phandle of the clock generating SPI clock on the bus.
- clock-names: Should be "mck0".
- cs-gpios: Specifies the gpio pins to be used for chipselects.
See: Documentation/devicetree/bindings/spi/spi-bus.txt
Optional properties:
- dmas: Two or more DMA channel specifiers following the convention outlined
in Documentation/devicetree/bindings/dma/dma.txt
- dma-names: Names for the dma channels. There must be at least one channel
named "spi-tx" for transmit and named "spi-rx" for receive.
Example:
spi1: spi@1f821000 {
compatible = "microchip,pic32mzda-spi";
reg = <0x1f821000 0x200>;
interrupts = <109 IRQ_TYPE_LEVEL_HIGH>,
<110 IRQ_TYPE_LEVEL_HIGH>,
<111 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "fault", "rx", "tx";
clocks = <&PBCLK2>;
clock-names = "mck0";
cs-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
dmas = <&dma 134>, <&dma 135>;
dma-names = "spi-rx", "spi-tx";
};