Message-ID: <4ea0b16e-0cec-00db-c598-e0364a7edef8@alliedtelesis.co.nz>
Date:   Mon, 5 Jun 2023 20:44:38 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "conor@...nel.org" <conor@...nel.org>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "enachman@...vell.com" <enachman@...vell.com>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Subject: Re: [PATCH v8 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT
 scheme


On 4/06/23 21:26, Krzysztof Kozlowski wrote:
> On 02/06/2023 01:06, Chris Packham wrote:
>> Hi Krzystof,
>>
>> On 1/06/23 19:05, Krzysztof Kozlowski wrote:
>>> On 01/06/2023 01:49, Chris Packham wrote:
>>>> From: Vadym Kochan <vadym.kochan@...ision.eu>
>>>>
>>>> Switch the DT binding to a YAML schema to enable the DT validation.
>>>>
>>>> The text binding didn't mention it as a requirement but existing usage
>>>> has
>>>>
>>>>      compatible = "marvell,armada-8k-nand-controller",
>>>>                   "marvell,armada370-nand-controller";
>>>>
>>>> so the YAML allows this in addition to the individual compatible values.
>>>>
>>>> There was also an incorrect reference to dma-names being "rxtx" where
>>>> the driver and existing device trees actually use dma-names = "data" so
>>>> this is corrected in the conversion.
>>>>
>>>> Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
>>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>> ---
>>>>
>>>> Notes:
>>>>       Changes in v8:
>>>>       - Mark deprecated compatible values as such
>>>>       - Allow "marvell,armada-8k-nand-controller" without
>>>>         "marvell,armada370-nand-controller"
>>>>       - Make dma-names usage reflect reality
>>>>       - Update commit message
>>>>       
>>>>       Changes in v7:
>>>>       - Restore "label" and "partitions" properties (should be picked up via
>>>>         nand-controller.yaml but aren't)
>>> What do you mean by "aren't"? They are not needed.
>> (sorry I keep responding to snippets rather than putting all the replies
>> in one place. For posterity here's the same response I provided in a
>> separate message).
>>
>> I mean I simply cannot make it work and I'm out of ideas (I'm also in an
>> awkward timezone so it takes 24hrs for me to ask a question and get a
>> response which leads to me making guesses instead of waiting).
>>
>> nand-controller.yaml references nand-chip.yaml which references mtd.yaml
>> which defines the "label" and "partitions" property.
>>
>> I thought marvell,nand-controller.yaml could just say `$ref:
>> nand-controller.yaml` and it would mean I'd get all the definitions down
>> the chain but this doesn't seem to work the way I expect (or more likely
>> I'm not doing it right). I thought it might have something to do with
>> the different patternProperties pattern but even when I make that match
>> what is used in nand-controller.yaml it doesn't seem to pick up those
>> properties.
> Then you are doing something different than all other bindings.

Not intentionally. I should probably check that the existing bindings 
actually work as expected.

One thing that this has that the others don't is including "label" and 
"partitions" in the examples.

>>>>       - Add/restore nand-on-flash-bbt and nand-ecc-mode which aren't covered
>>>>         by nand-controller.yaml.
>>>>       - Use "unevalautedProperties: false"
>>>>       - Corrections for clock-names, dma-names, nand-rb and nand-ecc-strength
>>>>       - Add pxa3xx-nand-controller example
>>>>       
>>>>       Changes in v6:
>>>>       - remove properties covered by nand-controller.yaml
>>>>       - add example using armada-8k compatible
>>>>       
>>>>       earlier changes:
>>>>       
>>>>       v5:
>>>>          1) Get back "label" and "partitions" properties but without
>>>>             ref to the "partition.yaml" which was wrongly used.
>>>>       
>>>>          2) Add "additionalProperties: false" for nand@ because all possible
>>>>             properties are described.
>>>>       
>>>>       v4:
>>>>          1) Remove "label" and "partitions" properties
>>>>       
>>>>          2) Use 2 clocks for A7K/8K platform which is a requirement
>>>>       
>>>>       v3:
>>>>         1) Remove txt version from the MAINTAINERS list
>>>>       
>>>>         2) Use enum for some of compatible strings
>>>>       
>>>>         3) Drop:
>>>>               #address-cells
>>>>               #size-cells:
>>>>       
>>>>            as they are inherited from the nand-controller.yaml
>>>>       
>>>>         4) Add restriction to use 2 clocks for A8K SoC
>>>>       
>>>>         5) Dropped description for clock-names and extend it with
>>>>            minItems: 1
>>>>       
>>>>         6) Drop description for "dmas"
>>>>       
>>>>         7) Use "unevalautedProperties: false"
>>>>       
>>>>         8) Drop quites from yaml refs.
>>>>       
>>>>         9) Use 4-space indentation for the example section
>>>>       
>>>>       v2:
>>>>         1) Fixed warning by yamllint with incorrect indentation for compatible list
>>>>
>>>>    .../bindings/mtd/marvell,nand-controller.yaml | 223 ++++++++++++++++++
>>>>    .../devicetree/bindings/mtd/marvell-nand.txt  | 126 ----------
>>>>    MAINTAINERS                                   |   1 -
>>>>    3 files changed, 223 insertions(+), 127 deletions(-)
>>>>    create mode 100644 Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>>>    delete mode 100644 Documentation/devicetree/bindings/mtd/marvell-nand.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>>> new file mode 100644
>>>> index 000000000000..433feb430555
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
>>>> @@ -0,0 +1,223 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://scanmail.trustwave.com/?c=20988&d=yNj85IkMld8k0XBdA9CH4pQjE5peaXAdz-exk_Hdww&u=http%3a%2f%2fdevicetree%2eorg%2fschemas%2fmtd%2fmarvell%2cnand-controller%2eyaml%23
>>>> +$schema: http://scanmail.trustwave.com/?c=20988&d=yNj85IkMld8k0XBdA9CH4pQjE5peaXAdz-PkkPSLlg&u=http%3a%2f%2fdevicetree%2eorg%2fmeta-schemas%2fcore%2eyaml%23
>>>> +
>>>> +title: Marvell NAND Flash Controller (NFC)
>>>> +
>>>> +maintainers:
>>>> +  - Miquel Raynal <miquel.raynal@...tlin.com>
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    oneOf:
>>>> +      - items:
>>>> +          - const: marvell,armada-8k-nand-controller
>>>> +          - const: marvell,armada370-nand-controller
>>>> +      - enum:
>>>> +          - marvell,armada-8k-nand-controller
>>>> +          - marvell,armada370-nand-controller
>>>> +          - marvell,pxa3xx-nand-controller
>>>> +      - description: legacy bindings
>>>> +        deprecated: true
>>>> +        enum:
>>>> +          - marvell,armada-8k-nand
>>>> +          - marvell,armada370-nand
>>>> +          - marvell,pxa3xx-nand
>>>> +
>>>> +  reg:
>>>> +    maxItems: 1
>>>> +
>>>> +  interrupts:
>>>> +    maxItems: 1
>>>> +
>>>> +  clocks:
>>>> +    description:
>>>> +      Shall reference the NAND controller clocks, the second one is
>>>> +      is only needed for the Armada 7K/8K SoCs
>>>> +    minItems: 1
>>>> +    maxItems: 2
>>>> +
>>>> +  clock-names:
>>>> +    minItems: 1
>>>> +    items:
>>>> +      - const: core
>>>> +      - const: reg
>>>> +
>>>> +  dmas:
>>>> +    maxItems: 1
>>>> +
>>>> +  dma-names:
>>>> +    items:
>>>> +      - const: data
>>>> +
>>>> +  marvell,system-controller:
>>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>>> +    description: Syscon node that handles NAND controller related registers
>>>> +
>>>> +patternProperties:
>>>> +  "^nand@[0-3]$":
>>>> +    type: object
>>>> +    unevaluatedProperties: false
>>>> +    properties:
>>>> +      reg:
>>>> +        minimum: 0
>>>> +        maximum: 3
>>>> +
>>>> +      nand-rb:
>>>> +        minItems: 1
>>> Drop minItems.
>>>
>>>> +        maxItems: 1
>>> Didn't you have here minimum and maximum? I think I did not ask to
>>> remove them.
>> I did but I couldn't figure out how to do minimum and maximum with an
>> array would the following be correct (note removing both minItems and
>> maxItems as dtb_check complains if I have maxItems and items).
> items:
>    minimum: n
>    maximum: n
>    maxItems: n
>
> or
>
> items:
>   - minimum: n
>     maximum: n
>
> See for example Documentation/devicetree/bindings/arm/l2c2x0.yaml
Thanks, so my suggestion below should be OK then.
>>          nand-rb:
>>           items:
>>             - minimum: 0
>>               maximum: 1
>>
>>>> +
>>>> +      nand-ecc-step-size:
>>>> +        const: 512
>>>> +
>>>> +      nand-ecc-strength:
>>>> +        enum: [1, 4, 8, 12, 16]
>>>> +
>>>> +      nand-on-flash-bbt:
>>>> +        $ref: /schemas/types.yaml#/definitions/flag
>>>> +
>>>> +      nand-ecc-mode:
>>>> +        const: hw
>>>> +
>>>> +      label:
>>>> +        $ref: /schemas/types.yaml#/definitions/string
>>> Drop label
>>>
>>>> +
>>>> +      partitions:
>>>> +        type: object
>>> Drop partitions.
>> This is the part I can't get to work. It should pick it up via
>> nand-controller.yaml but nothing I do seems to work.
>>
>>>> +
>>>> +      marvell,nand-keep-config:
>>>> +        description: |
>>>> +          Orders the driver not to take the timings from the core and
>>>> +          leaving them completely untouched. Bootloader timings will then
>>>> +          be used.
>>>> +        $ref: /schemas/types.yaml#/definitions/flag
>>>> +
>>>> +      marvell,nand-enable-arbiter:
>>>> +        description: |
>>>> +          To enable the arbiter, all boards blindly used it,
>>>> +          this bit was set by the bootloader for many boards and even if
>>>> +          it is marked reserved in several datasheets, it might be needed to set
>>>> +          it (otherwise it is harmless).
>>>> +        $ref: /schemas/types.yaml#/definitions/flag
>>>> +        deprecated: true
>>>> +
>>>> +    additionalProperties: false
>>> unevaluatedProperties: false
>> It was hiding by '"^nand@[0-3]$":'. Should I move it here?
> You cannot have both additionalProps and unevaluatedProps at the same
> time, so we do not talk about same thing or this was never working?

Hmm, I'm a little confused then. At various times I've been told to put 
'additionalProperties: false' or 'unevaluatedProperties: false' 
(although never at the same time). I'm not sure when to use one or the 
other.

 From what I've been able to glean 'additionalProperties: true' 
indicates that the node is expected to have child nodes defined in a 
different schema so I would have thought 'additionalProperties: false' 
would be appropriate for a schema covering a leaf node. 
'unevaluatedProperties: false' seems to enable stricter checking which 
makes sense when all the properties are described in the schema.


>
> Best regards,
> Krzysztof

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