linux-kernel - Re: [PATCH 1/3] ARM: dts: Bindings for Altera Quadspi Controller Version 2

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Date:   Tue, 27 Jun 2017 11:37:35 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     matthew.gerlach@...ux.intel.com, vndao@...era.com,
        dwmw2@...radead.org, computersforpeace@...il.com,
        boris.brezillon@...e-electrons.com, richard@....at,
        cyrille.pitchen@...ev4u.fr, robh+dt@...nel.org,
        mark.rutland@....com, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, davem@...emloft.net, mchehab@...nel.org
Subject: Re: [PATCH 1/3] ARM: dts: Bindings for Altera Quadspi Controller
 Version 2

On 06/26/2017 06:13 PM, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> 
> Device Tree bindings for Version 2 of the Altera Quadspi Controller
> that can be optionally paired with a windowed bridge.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---
>  .../devicetree/bindings/mtd/altera-quadspi-v2.txt  | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt b/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt
> new file mode 100644
> index 0000000..8ba63d7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/altera-quadspi-v2.txt
> @@ -0,0 +1,37 @@
> +* Altera Quad SPI Controller Version 2
> +
> +Required properties:
> +- compatible : Should be "altr,quadspi-v2".
> +- reg : Contains at least two entries, and possibly three entries, each of
> +	which is a tuple consisting of a physical address and length.
> +- reg-names : Should contain the names "avl_csr" and "avl_mem" corresponding
> +	      to the control and status registers and qspi memory, respectively.
> +
> +
> +The Altera Quad SPI Controller Version 2 can be paired with a windowed bridge
> +in order to reduce the footprint of the memory interface.  When a windowed
> +bridge is used, reads and writes of data must be 32 bits wide.
> +
> +Optional properties:
> +- reg-names : Should contain the name "avl_window", if the windowed bridge
> +	      is used.  This name corresponds to the register space that
> +	      controls the window.
> +- window-size : The size of the window which must be an even power of 2.
> +- read-bit-reverse : A boolean indicating the data read from the flash should
> +		     be bit reversed on a byte by byte basis before being
> +		     delivered to the MTD layer.
> +- write-bit-reverse : A boolean indicating the data written to the flash should
> +		      be bit reversed on a byte by byte basis.

Is there ever a usecase where you need to set just one of these props ?
Also, they're altera specific, so altr, prefix should be added.

> +Example:
> +
> +qspi: spi@...01000 {
> +	compatible = "altr,quadspi-v2";
> +	reg = <0xa0001000 0x40>, <0xb0000000 0x4000000>;
> +	reg-names = "avl_csr", "avl_mem";
> +
> +	flash@0 {
> +		reg = <0>;
> +		label = "FPGA Image";
> +	};
> +};
> 


-- 
Best regards,
Marek Vasut