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    Subject[PATCH v11 2/6] dt-bindings: add binding for atmel-usart in SPI mode
    Date
    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-for-MFD-by: Lee Jones <lee.jones@linaro.org>
    Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
    ---
    .../bindings/{serial => mfd}/atmel-usart.txt | 25 +++++++++++++++++--
    include/dt-bindings/mfd/at91-usart.h | 17 +++++++++++++
    2 files changed, 40 insertions(+), 2 deletions(-)
    rename Documentation/devicetree/bindings/{serial => mfd}/atmel-usart.txt (76%)
    create mode 100644 include/dt-bindings/mfd/at91-usart.h

    diff --git a/Documentation/devicetree/bindings/serial/atmel-usart.txt b/Documentation/devicetree/bindings/mfd/atmel-usart.txt
    similarity index 76%
    rename from Documentation/devicetree/bindings/serial/atmel-usart.txt
    rename to Documentation/devicetree/bindings/mfd/atmel-usart.txt
    index 7c0d6b2f53e4..0348fef0f497 100644
    --- a/Documentation/devicetree/bindings/serial/atmel-usart.txt
    +++ b/Documentation/devicetree/bindings/mfd/atmel-usart.txt
    @@ -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>;
    + };
    diff --git a/include/dt-bindings/mfd/at91-usart.h b/include/dt-bindings/mfd/at91-usart.h
    new file mode 100644
    index 000000000000..2de5bc312e1e
    --- /dev/null
    +++ b/include/dt-bindings/mfd/at91-usart.h
    @@ -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__ */
    --
    2.18.0
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