linux-kernel - Re: [PATCH v2 2/2] dt-bindings: nand: Add Cadence NAND controller driver

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Date:   Fri, 22 Feb 2019 14:40:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Piotr Sroka <piotrs@...ence.com>
Cc:     linux-kernel@...r.kernel.org,
        David Woodhouse <dwmw2@...radead.org>,
        BrianNorris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Mark Rutland <mark.rutland@....com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: nand: Add Cadence NAND controller
 driver

On Tue, Feb 19, 2019 at 04:19:20PM +0000, Piotr Sroka wrote:
> Signed-off-by: Piotr Sroka <piotrs@...ence.com>
> ---
> 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
>   under the NAND controller node 
> ---
>  .../bindings/mtd/cadence-nand-controller.txt       | 48 ++++++++++++++++++++++
>  1 file changed, 48 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..3d9b4decae24
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/cadence-nand-controller.txt
> @@ -0,0 +1,48 @@
> +* Cadence NAND controller
> +
> +Required properties:
> +  - compatible : "cdns,hpnfc"

Only one version of IP or is that discoverable?

> +  - 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 "cadence_reg" and "cadence_sdma"

'cadence_' part is pointless.

> +  - interrupts : The interrupt number.
> +  - clocks: phandle of the controller core clock (nf_clk).
> +  - Children nodes represent the available NAND chips.

Need a blank line and remove the '-' as it's not a property.

> +
> +Required properties of NAND chips:
> +  - reg: shall contain the native Chip Select ids from 0 to max supported by
> +    the cadence nand flash controller
> +
> +Optional properties:

For child nodes? If not move before child nodes.

> +  - dmas: shall reference DMA channel associated to the NAND controller
> +  - cdns,board-delay : 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

Units? Use unit suffix as defined in property-units.txt.

> +
> +See Documentation/devicetree/bindings/mtd/nand.txt for more details on
> +generic bindings.
> +
> +Example:
> +
> +nand_controller: nand-controller @60000000 {

space                              ^

> +	  compatible = "cdns,hpnfc";
> +	  reg = <0x60000000 0x10000>, <0x80000000 0x10000>;
> +	  reg-names = "cadence_reg", "cadence_sdma";
> +	  clocks = <&nf_clk>;
> +	  cdns,board-delay = <4830>;
> +	  interrupts = <2 0>;
> +	  nand@0 {
> +	      reg = <0>;
> +	      label = "nand-1";
> +	  };
> +	  nand@1 {
> +	      reg = <1>;
> +	      label = "nand-2";
> +	  };
> +
> +};
> -- 
> 2.15.0
>