linux-kernel - Re: [PATCH v2 1/1] platform: goldfish: pipe: add devicetree bindings

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Date:	Wed, 25 Nov 2015 14:24:16 -0600
From:	Rob Herring <robh@...nel.org>
To:	Jin Qian <jinqian@...roid.com>
Cc:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Greg Hackmann <ghackmann@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Joe Perches <joe@...ches.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Peter Senna Tschudin <peter.senna@...il.com>,
	Alex Bennée <alex.bennee@...aro.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] platform: goldfish: pipe: add devicetree bindings

On Wed, Nov 25, 2015 at 11:59:37AM -0800, Jin Qian wrote:
> From: Greg Hackmann <ghackmann@...gle.com>
> 
> Signed-off-by: Greg Hackmann <ghackmann@...gle.com>
> (cherry picked from commit 3c56d07eb796066530e93a40e74dea3bc59bf4cf)
> Signed-off-by: Jin Qian <jinqian@...roid.com>
> ---
>  Documentation/devicetree/bindings/goldfish/pipe.txt | 17 +++++++++++++++++
>  drivers/platform/goldfish/goldfish_pipe.c           | 10 +++++++++-
>  2 files changed, 26 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/goldfish/pipe.txt
> 
> diff --git a/Documentation/devicetree/bindings/goldfish/pipe.txt b/Documentation/devicetree/bindings/goldfish/pipe.txt
> new file mode 100644
> index 0000000..6d3801e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/goldfish/pipe.txt
> @@ -0,0 +1,17 @@
> +Android Goldfish QEMU Pipe
> +
> +Andorid pipe virtual device generated by android emulator.

The binding may be trivial, but there's a bigger question of whether 
this is the right long term direction. For example is upstream QEMU 
going to take all the Android pipe stuff? Couldn't virtio be used here 
as the transport?

Rob

> +
> +Required properties:
> +
> +- compatible : should contain "generic,android-pipe" to match emulator
> +- reg        : <registers mapping>
> +- interrupts : <interrupt mapping>
> +
> +Example:
> +
> +	android_pipe@...0000 {
> +		compatible = "generic,android-pipe";
> +		reg = <ff018000 0x2000>;
> +		interrupts = <0x12>;
> +	};
> diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
> index 20a9337..86cc57f 100644
> --- a/drivers/platform/goldfish/goldfish_pipe.c
> +++ b/drivers/platform/goldfish/goldfish_pipe.c
> @@ -624,11 +624,19 @@ static int goldfish_pipe_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct of_device_id goldfish_pipe_of_match[] = {
> +	{ .compatible = "generic,android-pipe", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, goldfish_pipe_of_match);
> +
>  static struct platform_driver goldfish_pipe = {
>  	.probe = goldfish_pipe_probe,
>  	.remove = goldfish_pipe_remove,
>  	.driver = {
> -		.name = "goldfish_pipe"
> +		.name = "goldfish_pipe",
> +		.owner = THIS_MODULE,
> +		.of_match_table = goldfish_pipe_of_match,
>  	}
>  };
>  
> -- 
> 2.6.0.rc2.230.g3dd15c0
> 
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