linux-kernel - Re: [PATCH v17 2/6] ARM: socfpga: add bindings document for fpga bridge drivers

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Date:	Fri, 4 Mar 2016 22:34:55 -0600
From:	Rob Herring <robh@...nel.org>
To:	Alan Tull <atull@...nsource.altera.com>
Cc:	pantelis.antoniou@...sulko.com,
	Moritz Fischer <moritz.fischer@...us.com>,
	gregkh@...uxfoundation.org, monstr@...str.eu,
	michal.simek@...inx.com, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	delicious.quinoa@...il.com, dinguyen@...nsource.altera.com,
	Matthew Gerlach <mgerlach@...era.com>
Subject: Re: [PATCH v17 2/6] ARM: socfpga: add bindings document for fpga
 bridge drivers

On Thu, Feb 25, 2016 at 05:25:07PM -0600, Alan Tull wrote:
> Add bindings documentation for Altera SOCFPGA bridges:
>  * fpga2sdram
>  * fpga2hps
>  * hps2fpga
>  * lwhps2fpga
> 
> Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> Signed-off-by: Matthew Gerlach <mgerlach@...era.com>
> Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> ---
> v2:  separate into 2 documents for the 2 drivers
> v12: bump version to line up with simple-fpga-bus version
>      remove Linux specific notes such as references to sysfs
>      move non-DT specific documentation elsewhere
>      remove bindings that would have been used to pass configuration
>      clean up formatting
> v13: Remove 'label' property
>      Change property from init-val to bridge-enable
>      Fix email address
> v14: Add resets
>      Change order of bridges to put lw bridge (controlling bridge) first
> v15: No change in this patch for v15 of this patch set
> v16: Added regs property, cleaned up unit addresses
> v17: No change to this patch in v17 of patch set
> ---
>  .../bindings/fpga/altera-fpga2sdram-bridge.txt     |   15 +++++++
>  .../bindings/fpga/altera-hps2fpga-bridge.txt       |   47 ++++++++++++++++++++
>  2 files changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
>  create mode 100644 Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.txt

Just a few minor things.

> diff --git a/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt b/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
> new file mode 100644
> index 0000000..4479a79
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
> @@ -0,0 +1,15 @@
> +Altera FPGA To SDRAM Bridge Driver
> +
> +Required properties:
> +- compatible		: Should contain "altr,socfpga-fpga2sdram-bridge"
> +
> +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.
> +
> +Example:
> +	fpga2sdram_br {

fpga-bridge@??

> +		compatible = "altr,socfpga-fpga2sdram-bridge";
> +		bridge-enable = <0>;
> +	};
> diff --git a/Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.txt b/Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.txt
> new file mode 100644
> index 0000000..e6b7474
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.txt
> @@ -0,0 +1,47 @@
> +Altera FPGA/HPS Bridge Driver
> +
> +Required properties:
> +- regs		: base address and size for AXI bridge module
> +- compatible	: Should contain one of:
> +		  "altr,socfpga-lwhps2fpga-bridge",
> +		  "altr,socfpga-hps2fpga-bridge", or
> +		  "altr,socfpga-fpga2hps-bridge"
> +- reset-names	: Should contain one of:
> +		  "lwhps2fpga",
> +		  "hps2fpga", or
> +		  "fpga2hps"

Names should be the input signal names. Do you need names with only one?

> +- resets	: Phandle and reset specifier for the reset listed in
> +		  reset-names
> +- clocks	: Clocks used by this module.
> +
> +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 its current state.
> +
> +Example:
> +	hps_fpgabridge0: fpgabridge@...00000 {

No underscores.

fpga-bridge@...

> +		compatible = "altr,socfpga-lwhps2fpga-bridge";
> +		reg = <0xff400000 0x100000>;
> +		resets = <&rst LWHPS2FPGA_RESET>;
> +		reset-names = "lwhps2fpga";
> +		clocks = <&l4_main_clk>;
> +		bridge-enable = <0>;
> +	};
> +
> +	hps_fpgabridge1: fpgabridge@...00000 {
> +		compatible = "altr,socfpga-hps2fpga-bridge";
> +		reg = <0xff500000 0x10000>;
> +		resets = <&rst HPS2FPGA_RESET>;
> +		reset-names = "hps2fpga";
> +		clocks = <&l4_main_clk>;
> +		bridge-enable = <1>;
> +	};
> +
> +	hps_fpgabridge2: fpgabridge@...00000 {
> +		compatible = "altr,socfpga-fpga2hps-bridge";
> +		reg = <0xff600000 0x100000>;
> +		resets = <&rst FPGA2HPS_RESET>;
> +		reset-names = "fpga2hps";
> +		clocks = <&l4_main_clk>;
> +	};
> -- 
> 1.7.9.5
>