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dt-bindings: Add binding for atmel-usart in SPI mode 

This patch moves the bindings for serial from serial/atmel-usart.txt to
mfd/atmel-usart.txt and adds bindings for USART in SPI mode.

Signed-off-by: Radu Pirea <radu.pirea@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Radu Pirea 2018-07-13 19:47:32 +03:00 committed by Lee Jones
parent 64f3b6334d
commit a785ce4c6d
2 changed files with 40 additions and 2 deletions
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25
Documentation/devicetree/bindings/serial/atmel-usart.txt → Documentation/devicetree/bindings/mfd/atmel-usart.txt
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@ -1,6 +1,6 @@
* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
Required properties:
Required properties for USART:
- compatible: Should be "atmel,<chip>-usart" or "atmel,<chip>-dbgu"
The compatible <chip> indicated will be the first SoC to support an
additional mode or an USART new feature.
@ -11,7 +11,13 @@ Required properties:
Required elements: "usart"
- clocks: phandles to input clocks.
Optional properties:
Required properties for USART in SPI mode:
- #size-cells : Must be <0>
- #address-cells : Must be <1>
- cs-gpios: chipselects (internal cs not supported)
- atmel,usart-mode : Must be <AT91_USART_MODE_SPI> (found in dt-bindings/mfd/at91-usart.h)
Optional properties in serial mode:
- atmel,use-dma-rx: use of PDC or DMA for receiving data
- atmel,use-dma-tx: use of PDC or DMA for transmitting data
- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD line respectively.
@ -62,3 +68,18 @@ Example:
dma-names = "tx", "rx";
atmel,fifo-size = <32>;
};
- SPI mode:
#include <dt-bindings/mfd/at91-usart.h>
spi0: spi@f001c000 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "atmel,at91rm9200-usart", "atmel,at91sam9260-usart";
atmel,usart-mode = <AT91_USART_MODE_SPI>;
reg = <0xf001c000 0x100>;
interrupts = <12 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&usart0_clk>;
clock-names = "usart";
cs-gpios = <&pioB 3 0>;
};

17
include/dt-bindings/mfd/at91-usart.h Normal file
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@ -0,0 +1,17 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* This header provides macros for AT91 USART DT bindings.
*
* Copyright (C) 2018 Microchip Technology
*
* Author: Radu Pirea <radu.pirea@microchip.com>
*
*/
#ifndef __DT_BINDINGS_AT91_USART_H__
#define __DT_BINDINGS_AT91_USART_H__
#define AT91_USART_MODE_SERIAL 0
#define AT91_USART_MODE_SPI 1
#endif /* __DT_BINDINGS_AT91_USART_H__ */