linux-kernel - Re: [PATCH 09/14] DEVICETREE: Add bindings for PIC32 usart driver

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Date:	Sun, 22 Nov 2015 15:56:22 -0600
From:	Rob Herring <robh@...nel.org>
To:	Joshua Henderson <joshua.henderson@...rochip.com>
Cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Andrei Pistirica <andrei.pistirica@...rochip.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 09/14] DEVICETREE: Add bindings for PIC32 usart driver

On Fri, Nov 20, 2015 at 05:17:21PM -0700, Joshua Henderson wrote:
> From: Andrei Pistirica <andrei.pistirica@...rochip.com>
> 
> Document the devicetree bindings for the USART peripheral found on
> Microchip PIC32 class devices.
> 
> Signed-off-by: Andrei Pistirica <andrei.pistirica@...rochip.com>
> Signed-off-by: Joshua Henderson <joshua.henderson@...rochip.com>
> ---
>  .../bindings/serial/microchip,pic32-usart.txt      |   29 ++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/serial/microchip,pic32-usart.txt
> 
> diff --git a/Documentation/devicetree/bindings/serial/microchip,pic32-usart.txt b/Documentation/devicetree/bindings/serial/microchip,pic32-usart.txt
> new file mode 100644
> index 0000000..c87321c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/microchip,pic32-usart.txt
> @@ -0,0 +1,29 @@
> +* Microchip Universal Synchronous Asynchronous Receiver/Transmitter (USART)
> +
> +Required properties:
> +- compatible: Should be "microchip,pic32-usart"

Again, should be more specific.

> +- reg: Should contain registers location and length
> +- interrupts: Should contain interrupt
> +- pinctrl: Should contain pinctrl for TX/RX/RTS/CTS
> +
> +Optional properties:
> +- microchip,uart-has-rtscts : Indicate the uart has hardware flow control
> +- rts-gpios: RTS pin for USP-based UART if microchip,uart-has-rtscts
> +- cts-gpios: CTS pin for USP-based UART if microchip,uart-has-rtscts

This appears to just be copied for Sirf UART.

Doesn't *-gpios being present imply having h/w 
flow-control (i.e. microchip,uart-has-rtscts)?

Rob

> +
> +Example:
> +	usart0: serial@...22000 {
> +		compatible = "microchip,pic32-usart";
> +		reg = <0x1f822000 0x50>;
> +		interrupts = <UART1_FAULT DEFAULT_INT_PRI IRQ_TYPE_NONE>,
> +			     <UART1_RECEIVE_DONE DEFAULT_INT_PRI IRQ_TYPE_NONE>,
> +			     <UART1_TRANSFER_DONE DEFAULT_INT_PRI IRQ_TYPE_NONE>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <
> +			&pinctrl_uart1
> +			&pinctrl_uart1_cts
> +			&pinctrl_uart1_rts>;
> +		microchip,uart-has-rtscts;
> +		cts-gpios = <&pioB 15 0>;
> +		rts-gpios = <&pioD 1 0>;
> +	};
> -- 
> 1.7.9.5
> 
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