linux-kernel - Re: [PATCH] dt-bindings: mtd: ti,gpmc-nand: Add missing 'rb-gpios'

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Message-ID: <bebef734-d0d3-e78e-e07a-9160ead1f673@kernel.org>
Date:   Thu, 9 Dec 2021 12:08:07 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Rob Herring <robh@...nel.org>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mtd: ti,gpmc-nand: Add missing 'rb-gpios'

Hi Miquel,

On 09/12/2021 11:42, Miquel Raynal wrote:
> Hi Rob,
> 
> robh@...nel.org wrote on Mon,  6 Dec 2021 11:42:09 -0600:
> 
>> With 'unevaluatedProperties' support implemented, the TI GPMC example
>> has a warning:
>>
>> Documentation/devicetree/bindings/memory-controllers/ti,gpmc.example.dt.yaml: nand@0,0: Unevaluated properties are not allowed ('rb-gpios' was unexpected)
>>
>> Add the missing definition for 'rb-gpios'.
> 
> rb-gpios is already defined in nand-controller.yaml. I seems like the
> real problem is that this file does not refer to it. Can you update the
> fix?

I don't think we can refer to nand-controller.yaml right now as we are not
fully compatible with it yet. Please see examples below.

ti,gpmc-nand example:

      nand@0,0 {
        compatible = "ti,omap2-nand";
        reg = <0 0 4>;          /* device IO registers */
        interrupt-parent = <&gpmc>;
        interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
                     <1 IRQ_TYPE_NONE>; /* termcount */
        ti,nand-xfer-type = "prefetch-dma";
        ti,nand-ecc-opt = "bch16";
        ti,elm-id = <&elm>;
        #address-cells = <1>;
        #size-cells = <1>;

        /* NAND generic properties */
        nand-bus-width = <8>;
        rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>;  /* gpmc_wait0 */

        /* GPMC properties*/
        gpmc,device-width = <1>;

        partition@0 {
          label = "NAND.SPL";
          reg = <0x00000000 0x00040000>;
        };
        partition@1 {
          label = "NAND.SPL.backup1";
          reg = <0x00040000 0x00040000>;
        };
      };


nand-controller example:

    nand-controller {
      #address-cells = <1>;
      #size-cells = <0>;
      cs-gpios = <0>, <&gpioA 1>; /* A single native CS is available */

      /* controller specific properties */

      nand@0 {
        reg = <0>; /* Native CS */
        nand-use-soft-ecc-engine;
        nand-ecc-algo = "bch";

        /* controller specific properties */
      };

      nand@1 {
        reg = <1>; /* GPIO CS */
      };
    };


> 
> While at it you might also want to drop the rb-gpios property from
> ingenic,nand.yaml, which also defines it a second time.
> 
>> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
>> Cc: Richard Weinberger <richard@....at>
>> Cc: Vignesh Raghavendra <vigneshr@...com>
>> Cc: Tony Lindgren <tony@...mide.com>
>> Cc: Roger Quadros <rogerq@...nel.org>
>> Cc: linux-mtd@...ts.infradead.org
>> Signed-off-by: Rob Herring <robh@...nel.org>
>> ---
>>  Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
>> index beb26b9bcfb2..1c280f52baa0 100644
>> --- a/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
>> +++ b/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml
>> @@ -53,6 +53,11 @@ properties:
>>      enum: [8, 16]
>>      default: 8
>>  
>> +  rb-gpios:
>> +    description:
>> +      GPIO connection to R/B signal from NAND chip
>> +    maxItems: 1
>> +
>>  patternProperties:
>>    "@[0-9a-f]+$":
>>      $ref: "/schemas/mtd/partitions/partition.yaml"
> 
> Thanks,
> Miquèl
> 

cheers,
-roger