linux-kernel - Re: [PATCH 1/2] remoteproc: microblaze: Document device tree bindings

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Message-ID: <20150119110436.GD21553@leverpostej>
Date:	Mon, 19 Jan 2015 11:04:36 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"monstr@...str.eu" <monstr@...str.eu>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] remoteproc: microblaze: Document device tree bindings

On Mon, Jan 19, 2015 at 10:30:19AM +0000, Michal Simek wrote:
> Add device tree binding documentation for the Microblaze remoteproc
> on Xilinx Zynq.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
>  .../bindings/remoteproc/mb_remoteproc.txt          | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/mb_remoteproc.txt
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/mb_remoteproc.txt b/Documentation/devicetree/bindings/remoteproc/mb_remoteproc.txt
> new file mode 100644
> index 000000000000..a2490eac0208
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/mb_remoteproc.txt
> @@ -0,0 +1,46 @@
> +Xilinx ARM-Microblaze remoteproc driver
> +
> +This driver requires specific Zynq hardware design where Microblaze is added
> +to the programmable logic.

The binding should describe the _hardware_, not the particular driver.
Please remove any references to the 'driver'.

What hardware does this binding describe? Please focus on that.

> +Microblaze is connected with PS block via axi bus connected to PS HP port
> +to ensure access to PS DDR.
> +Communication channels are done via soft GPIO IP connected to PS block
> +and to Microblaze. There are also 2 gpio control signals reset and debug
> +which are used for resetting Microblaze.
> +
> +Required properties:
> +- compatible : Should be "xlnx,mb_remoteproc"

s/_/-/ in compatible strings please.

> +- reg : Address and length of the ddr address space
> +- bram: Phandle to bram controller which can access Microblaze BRAM
> +- bram-firmware : Microblaze BRAM bootloader name

Huh? What's this aname used for?

This looks like a filesystem name, which shouldn't be in the DT.

> +- firmware : Default firmware name which can be override by
> +	     "firmware" module parameter

Likewise on all points.

> +- reset : Gpio phandle which reset Microblaze remoteproc
> +- debug : Gpio phandle which setup Microblaze to debug state
> +- ipino : Gpio phandle for Microblaze to ARM communication
> +- vring0 : Gpio phandle for ARM to Microblaze communication vring 0
> +- vring1 : Gpio phandle for ARM to Microblaze communication vring 1

s/phandle/ / -- there's a gpio-specifier too, but we may as well just
ignore the specifics of the format and leave that to the GPIO bindings.

These should all have a "-gpio" suffix, too.

> +
> +Microblaze SoC can be also connected to the PS block via a axi bus.
> +That's why there is the option to allocate interrupts for Microblaze use only.
> +The driver will allocate interrupts to itself and Microblaze sw has to ensure
> +that interrupts are properly enabled and handled by Microblaze interrupt
> +controller.

I'm not sure I follow? What is this for?

Thanks,
Mark.

> +
> +Optional properties:
> + - interrupts : Interrupt mapping for remoteproc
> + - interrupt-parent : Phandle for the interrupt controller
> +
> +Example:
> +mb_remoteproc@...000 {
> +	compatible = "xlnx,mb_remoteproc";
> +	reg = < 0x8000000 0x8000000 >;
> +	bram = <&axi_bram_ctrl_0>;
> +	bram-firmware = "mb.bin";
> +	firmware = "image.elf";
> +	reset = <&zynq_gpio_reset 1 0>;
> +	debug = <&zynq_gpio_reset 0 0>;
> +	ipino = <&zynq_gpio_vring 0 0>;
> +	vring0 = <&zynq_gpio_vring 1 0>;
> +	vring1 = <&zynq_gpio_vring 2 0>;
> +};
> --
> 1.8.2.3
> 


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