linux-kernel - Re: [PATCH] mfd: Add driver for RAVE Supervisory Processor

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Date:   Fri, 9 Jun 2017 08:49:52 -0500
From:   Rob Herring <robh@...nel.org>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, cphealy@...il.com,
        Lucas Stach <l.stach@...gutronix.de>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: Add driver for RAVE Supervisory Processor

On Tue, Jun 06, 2017 at 11:06:43AM -0700, Andrey Smirnov wrote:
> Add a driver for RAVE Supervisory Processor, an MCU implementing
> varoius bits of housekeeping functionality (watchdoging, backlight
> control, LED control, etc) on RAVE family of products by Zodiac
> Inflight Innovations.
> 
> This driver implementes core MFD/serdev device as well as
> communication subroutines necessary for commanding the device.
> 
> Cc: cphealy@...il.com
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
> 
> Note that the driver for "zii,rave-sp-watchdog" exists, but I haven't
> submitted it yet, becuase I wanted to make sure that API exposed by
> this MFD is acceptable and doesn't need drastic changes
> 
>  .../devicetree/bindings/mfd/zii,rave-sp.txt        |   33 +
>  drivers/mfd/Kconfig                                |    9 +
>  drivers/mfd/Makefile                               |    1 +
>  drivers/mfd/rave-sp.c                              | 1009 ++++++++++++++++++++
>  include/linux/rave-sp.h                            |   54 ++
>  5 files changed, 1106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/zii,rave-sp.txt
>  create mode 100644 drivers/mfd/rave-sp.c
>  create mode 100644 include/linux/rave-sp.h
> 
> diff --git a/Documentation/devicetree/bindings/mfd/zii,rave-sp.txt b/Documentation/devicetree/bindings/mfd/zii,rave-sp.txt
> new file mode 100644
> index 0000000..46a904c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/zii,rave-sp.txt
> @@ -0,0 +1,33 @@
> +Zodiac Inflight Innovations RAVE Supervisory Processor
> +
> +Required parent device properties:
> +
> + - compatible: Should be one of:
> +	- "zii,rave-sp-niu"
> +	- "zii,rave-sp-mezz"
> +	- "zii,rave-sp-esb"
> +	- "zii,rave-sp-rdu1"
> +	- "zii,rave-sp-rdu2"
> +
> + - current-speed: Should be set to baud rate SP device is using
> +

Please clarify that this must be a child of a serial device node.

> +RAVE SP consists of the following sub-devices:
> +
> +Device				 Description
> +------				 -----------
> +rave-sp-wdt			: Watchdog
> +
> +
> +Example of usage:
> +
> +	rdu {
> +		compatible = "zii,rave-sp-rdu2";
> +		current-speed = <1000000>;
> +		status = "okay";

Don't show status in examples.

> +
> +		watchdog {
> +			compatible = "zii,rave-sp-watchdog";
> +			status = "okay";
> +		};
> +	};
> +