Re: [v5 2/2] dt-bindings: mtd: Add Cadence NAND controller driver

From: Rob Herring <robh@kernel.org>
To: Piotr Sroka <piotrs@cadence.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org,
	Boris Brezillon <bbrezillon@kernel.org>,
	Richard Weinberger <richard@nod.at>,
	linux-kernel@vger.kernel.org, Marek Vasut <marek.vasut@gmail.com>,
	linux-mtd@lists.infradead.org,
	BrianNorris <computersforpeace@gmail.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Kazuhiro Kasai <kasai.kazuhiro@socionext.com>
Subject: Re: [v5 2/2] dt-bindings: mtd: Add Cadence NAND controller driver
Date: Fri, 16 Aug 2019 16:31:10 -0500
Message-ID: <20190816213110.GA31192@bogus> (raw)
In-Reply-To: <20190725145955.13951-1-piotrs@cadence.com>

On Thu, Jul 25, 2019 at 03:59:55PM +0100, Piotr Sroka wrote:
> Document the bindings used by Cadence NAND controller driver
> 
> Signed-off-by: Piotr Sroka <piotrs@cadence.com>
> ---
> Changes for v5:
> - replace "_" by "-" in all properties
> - change compatible name from cdns,hpnfc to cdns,hp-nfc
> Changes for v4:
> - add commit message
> Changes for v3:
> - add unit suffix for board_delay 
> - move child description to proper place
> - remove prefix cadence_ for reg and sdma fields
> Changes for v2:
> - remove chip dependends parameters from dts bindings
> - add names for register ranges in dts bindings
> - add generic bindings to describe NAND chip representation
> ---
>  .../bindings/mtd/cadence-nand-controller.txt       | 50 ++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/cadence-nand-controller.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/cadence-nand-controller.txt b/Documentation/devicetree/bindings/mtd/cadence-nand-controller.txt
> new file mode 100644
> index 000000000000..423547a3f993
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/cadence-nand-controller.txt
> @@ -0,0 +1,50 @@
> +* Cadence NAND controller
> +
> +Required properties:
> +  - compatible : "cdns,hp-nfc"
> +  - reg : Contains two entries, each of which is a tuple consisting of a
> +	  physical address and length. The first entry is the address and
> +	  length of the controller register set. The second entry is the
> +	  address and length of the Slave DMA data port.
> +  - reg-names: should contain "reg" and "sdma"
> +  - interrupts : The interrupt number.
> +  - clocks: phandle of the controller core clock (nf_clk).
> +
> +Optional properties:
> +  - dmas: shall reference DMA channel associated to the NAND controller
> +  - cdns,board-delay-ps : Estimated Board delay. The value includes the total
> +    round trip delay for the signals and is used for deciding on values
> +    associated with data read capture. The example formula for SDR mode is
> +    the following:
> +    board delay = RE#PAD delay + PCB trace to device + PCB trace from device
> +    + DQ PAD delay
> +
> +Child nodes represent the available NAND chips.
> +
> +Required properties of NAND chips:
> +  - reg: shall contain the native Chip Select ids from 0 to max supported by
> +    the cadence nand flash controller
> +
> +
> +See Documentation/devicetree/bindings/mtd/nand.txt for more details on
> +generic bindings.
> +
> +Example:
> +
> +nand_controller: nand-controller @60000000 {

space                              ^

> +	  compatible = "cdns,hp-nfc";
> +	  reg = <0x60000000 0x10000>, <0x80000000 0x10000>;
> +	  reg-names = "reg", "sdma";
> +	  clocks = <&nf_clk>;
> +	  cdns,board-delay-ps = <4830>;
> +	  interrupts = <2 0>;

You need #address-cells and #size-cells here.

With those fixes,

Reviewed-by: Rob Herring <robh@kernel.org>

> +	  nand@0 {
> +	      reg = <0>;
> +	      label = "nand-1";
> +	  };
> +	  nand@1 {
> +	      reg = <1>;
> +	      label = "nand-2";
> +	  };
> +
> +};
> -- 
> 2.15.0
> 

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