linux-kernel - Re: [PATCH 1/3] doc: dt: fpga: Added Documentation for Xilinx Zynq FPGA manager.

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Date:	Mon, 12 Oct 2015 09:33:41 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Moritz Fischer <moritz.fischer@...us.com>
CC:	<michal.simek@...inx.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <dinguyen@...nsource.altera.com>,
	<atull@...nsource.altera.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/3] doc: dt: fpga: Added Documentation for Xilinx Zynq
 FPGA manager.

On Fri, 2015-10-09 at 12:45AM +0200, Moritz Fischer wrote:
> Signed-off-by: Moritz Fischer <moritz.fischer@...us.com>
> ---
>  .../bindings/fpga/xilinx-zynq-fpga-mgr.txt         | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/fpga/xilinx-zynq-fpga-mgr.txt
> 
> diff --git a/Documentation/devicetree/bindings/fpga/xilinx-zynq-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/xilinx-zynq-fpga-mgr.txt
> new file mode 100644
> index 0000000..82ffda8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/xilinx-zynq-fpga-mgr.txt
> @@ -0,0 +1,26 @@
> +Xilinx Zynq FPGA Manager
> +
> +Required properties:
> +- compatible:		should contain "xlnx,zynq-devcfg-1.0"
> +- reg:			base address and size for memory mapped io
> +- interrupt parent:	interrupt source phandle
> +- interrupts:		interrupt for the FPGA manager device
> +- clocks:		phandle for clocks required operation
> +- syscon:		phandle for access to SLCR registers
> +
> +Optional properties:
> +- clock-names:		names for clocks

Is it optional? Currently, there is only one clock input, so a match
without specifying a clock name should work making this optional. But in
your implementation, you do specify a clock name in devm_clk_get(). I'm
not entirely sure, but that call might fail if it doesn't find the
corresponding clock-names property.
I think, either we should make this required and list the required
entries here. Or the implementation probably needs to drop the clock
name when looking up its input clock.

	Sören
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