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Commit a785ce4c authored by Radu Pirea's avatar Radu Pirea Committed by Lee Jones
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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: default avatarRadu Pirea <radu.pirea@microchip.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 64f3b633

Documentation/devicetree/bindings/serial/atmel-usart.txt→Documentation/devicetree/bindings/mfd/atmel-usart.txt

+23 −2
Original line number Diff line number Diff line 
* 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>;

	};

include/dt-bindings/mfd/at91-usart.h

0 → 100644
+17 −0
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/* 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__ */