linux-kernel - Re: [PATCH v2 2/2] serial: sc16is7xx: Add bindings documentation for the SC16IS7XX UARTs

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Date:	Wed, 26 Mar 2014 09:08:56 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	"jon@...gle.org" <jon@...gle.org>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH v2 2/2] serial: sc16is7xx: Add bindings documentation
 for the SC16IS7XX UARTs

On Tue, Mar 25, 2014 at 06:19:24PM +0000, jon@...gle.org wrote:
> From: Jon Ringle <jringle@...dpoint.com>
> 
> This patch adds the devicetree documentation for the NXP SC16IS7XX UARTs.
> 
> Signed-off-by: Jon Ringle <jringle@...dpoint.com>
> ---
>  .../devicetree/bindings/serial/nxp,sc16is7xx.txt   | 35 ++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> 
> diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> new file mode 100644
> index 0000000..cd9ae33
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> @@ -0,0 +1,35 @@
> +* NXP SC16IS7xx advanced Universal Asynchronous Receiver-Transmitter (UART)
> +
> +Required properties:
> +- compatible: Should be one of the following:
> +  - "nxp,sc16is740" for NXP SC16IS740,
> +  - "nxp,sc16is741" for NXP SC16IS741,
> +  - "nxp,sc16is750" for NXP SC16IS750,
> +  - "nxp,sc16is752" for NXP SC16IS752,
> +  - "nxp,sc16is760" for NXP SC16IS760,
> +  - "nxp,sc16is762" for NXP SC16IS762.

These all look fine.

> +- reg: I2C address of the SC16IS7xx device.
> +- interrupt-parent: The phandle for the interrupt controller that
> +  services interrupts for this IC.
> +- interrupts: Specifies the interrupt source of the parent interrupt
> +  controller. The format of the interrupt specifier depends on the
> +  parent interrupt controller.

Just describe what the device-specific interrupt logically is, not what
the interrupts property means in general.

> +- clocks: phandle to the IC source clock.

Nit: clocks aren't just referred to with phandles; there's a clock
specifier too.

Either correct the type here or don't mention the type at all, given
this is a common property.

> +
> +Optional properties:
> +- gpio-controller: Marks the device node as a GPIO controller.
> +- #gpio-cells: Should be two. The first cell is the GPIO number and
> +  the second cell is used to specify the GPIO polarity:
> +    0 = active high,
> +    1 = active low.
> +
> +Example:
> +        sc16is750: sc16is750@51 {
> +                compatible = "nxp,sc16is750";
> +                reg = <0x51>;
> +                clocks = <&clk20m>;
> +                interrupt-parent = <&gpio3>;
> +                interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +        };
> -- 
> 1.8.5.4
> 
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