linux-kernel - Re: [PATCH v3 1/2] doc: Add bindings document for Xilinx LogiCore PR Decoupler

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Date:   Fri, 24 Mar 2017 09:59:08 -0500
From:   Rob Herring <robh@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     linux-fpga@...r.kernel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        Michal Simek <michal.simek@...inx.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] doc: Add bindings document for Xilinx LogiCore PR
 Decoupler

On Fri, Mar 17, 2017 at 01:11:12PM -0700, Moritz Fischer wrote:
> This adds the binding documentation for the Xilinx LogiCORE PR
> Decoupler soft core.
> 
> Signed-off-by: Moritz Fischer <mdf@...nel.org>
> Cc: Michal Simek <michal.simek@...inx.com>
> Cc: Sören Brinkmann <soren.brinkmann@...inx.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> ---
> 
> Changes from v2:
> - Added refence to generic fpga-region bindings
> - Fixed up reg property in example
> - Added fallback to "xlnx,pr-decoupler" without version
> 
> Changes from v1:
> - Added clock names & clock to example
> - Merged some of the description from Michal's version
> 
> ---
>  .../bindings/fpga/xilinx-pr-decoupler.txt          | 35 ++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> 
> diff --git a/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> new file mode 100644
> index 0000000..16141bd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> @@ -0,0 +1,35 @@
> +Xilinx LogiCORE Partial Reconfig Decoupler Softcore
> +
> +The Xilinx LogiCORE Partial Reconfig Decoupler manages one or more
> +decouplers / fpga bridges.
> +The controller can decouple/disable the bridges which prevents signal
> +changes from passing through the bridge.  The controller can also
> +couple / enable the bridges which allows traffic to pass through the
> +bridge normally.
> +
> +The Driver supports only MMIO handling. A PR region can have multiple
> +PR Decouples which can bhe handled independently or chaines via decouple/

s/chaines/chains/

> +decouple_status signals.
> +
> +Required properties:
> +- compatible		: Should contain "xlnx,pr-decoupler-1.00"
> +- regs			: base address and size for decoupler module
> +- clocks		: input clock to IP
> +- clock-names		: should contain "aclk"
> +
> +Optional properties:
> +- bridge-enable		: 0 if driver should disable bridge at startup
> +			  1 if driver should enable bridge at startup
> +			  Default is to leave bridge in current state.

This is common and should move into a common doc. Maybe fpga-region.txt 
works?

> +
> +See Documentation/devicetree/bindings/fpga/fpga-region.txt for generic bindings.
> +
> +Example:
> +	fpga-bridge@...000450 {
> +		compatible = "xlnx,pr-decoupler-1.00",
> +			     "xlnx-pr-decoupler";
> +		regs = <0x10000045 0x10>;
> +		clocks = <&clkc 15>;
> +		clock-names = "aclk";
> +		bridge-enable = <0>;
> +	};
> -- 
> 2.7.4
>