linux-kernel - Re: [PATCH v2 2/6] dt-bindings: memory-controllers: ti,gpmc: Convert to yaml

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Message-ID: <9def1538-fc7e-cc1b-fba4-cba6f230c037@kernel.org>
Date:   Mon, 6 Sep 2021 10:10:08 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Tony Lindgren <tony@...mide.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Nishanth Menon <nm@...com>, Lokesh Vutla <lokeshvutla@...com>,
        devicetree@...r.kernel.org,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] dt-bindings: memory-controllers: ti,gpmc: Convert
 to yaml



On 03/09/2021 23:41, Rob Herring wrote:
> On Fri, Sep 3, 2021 at 4:35 AM Roger Quadros <rogerq@...nel.org> wrote:
>>
>> Hi Rob,
>>
>> On 02/09/2021 22:56, Rob Herring wrote:
>>> On Thu, Sep 02, 2021 at 12:56:05PM +0300, Roger Quadros wrote:
>>>> Convert omap-gpmc.txt to ti,gpmc.yaml.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>>> ---
>>>>  .../bindings/memory-controllers/omap-gpmc.txt | 157 --------
>>>>  .../bindings/memory-controllers/ti,gpmc.yaml  | 364 ++++++++++++++++++
>>>>  .../devicetree/bindings/mtd/gpmc-nand.txt     |   2 +-
>>>>  .../devicetree/bindings/mtd/gpmc-nor.txt      |   4 +-
>>>>  .../devicetree/bindings/mtd/gpmc-onenand.txt  |   2 +-
>>>>  .../devicetree/bindings/net/gpmc-eth.txt      |   4 +-
>>>>  6 files changed, 370 insertions(+), 163 deletions(-)
>>>>  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
>>>>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>>>
>>>> diff --git a/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>>>> new file mode 100644
>>>> index 000000000000..b7d43370a95d
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml
>>>> @@ -0,0 +1,364 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/memory-controllers/ti,gpmc.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Texas Instruments GPMC Memory Controller device-tree bindings
>>>> +
>>>> +maintainers:
>>>> +  - Tony Lindgren <tony@...mide.com>
>>>> +  - Roger Quadros <rogerq@...nel.org>
>>>> +
>>>> +description:
>>>> +  The GPMC is a unified memory controller dedicated for interfacing
>>>> +  with external memory devices like
>>>> +  - Asynchronous SRAM-like memories and ASICs
>>>> +  - Asynchronous, synchronous, and page mode burst NOR flash
>>>> +  - NAND flash
>>>> +  - Pseudo-SRAM devices
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    items:
>>>> +      - enum:
>>>> +          - ti,omap2420-gpmc
>>>> +          - ti,omap2430-gpmc
>>>> +          - ti,omap3430-gpmc
>>>> +          - ti,omap4430-gpmc
>>>> +          - ti,am3352-gpmc
>>>> +
>>>> +  reg:
>>>> +    items:
>>>> +      - description:
>>>> +          Configuration registers for the controller.
>>>
>>> Just 'maxItems: 1' is sufficient.
>>>
>>>> +
>>>> +  interrupts: true
>>>
>>> Need to define how many.
>>>
>>>> +
>>>> +  clocks:
>>>> +    maxItems: 1
>>>> +    description: |
>>>> +      Functional clock. Used for bus timing calculations and
>>>> +      GPMC configuration.
>>>> +
>>>> +  clock-names:
>>>> +    items:
>>>> +      - const: fck
>>>> +
>>>> +  dmas:
>>>> +    items:
>>>> +      - description: DMA channel for GPMC NAND prefetch
>>>> +
>>>> +  dma-names:
>>>> +    items:
>>>> +      - const: rxtx
>>>> +
>>>> +  "#address-cells":
>>>> +    const: 2
>>>> +
>>>> +  "#size-cells":
>>>> +    const: 1
>>>> +
>>>> +  gpmc,num-cs:
>>>> +    description: maximum number of supported chip-select lines.
>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>> +
>>>> +  gpmc,num-waitpins:
>>>> +    description: maximum number of supported wait pins.
>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>> +
>>>> +  ranges:
>>>> +    minItems: 1
>>>> +    description: |
>>>> +      Must be set up to reflect the memory layout with four
>>>> +      integer values for each chip-select line in use,
>>>> +      <cs-number> 0 <physical address of mapping> <size>
>>>> +
>>>> +    items:
>>>> +      - description: NAND bank 0
>>>> +      - description: NOR/SRAM bank 0
>>>> +      - description: NOR/SRAM bank 1
>>>> +
>>>> +  '#interrupt-cells':
>>>> +    const: 2
>>>> +
>>>> +  interrupt-controller:
>>>> +    description: |
>>>> +      The GPMC driver implements and interrupt controller for
>>>> +      the NAND events "fifoevent" and "termcount" plus the
>>>> +      rising/falling edges on the GPMC_WAIT pins.
>>>> +      The interrupt number mapping is as follows
>>>> +      0 - NAND_fifoevent
>>>> +      1 - NAND_termcount
>>>> +      2 - GPMC_WAIT0 pin edge
>>>> +      3 - GPMC_WAIT1 pin edge, and so on.
>>>> +
>>>> +  '#gpio-cells':
>>>> +     const: 2
>>>> +
>>>> +  gpio-controller:
>>>> +    description: |
>>>> +      The GPMC driver implements a GPIO controller for the
>>>> +      GPMC WAIT pins that can be used as general purpose inputs.
>>>> +      0 maps to GPMC_WAIT0 pin.
>>>> +
>>>> +  ti,hwmods:
>>>> +    description:
>>>> +      Name of the HWMOD associated with GPMC. This is for legacy
>>>> +      omap2/3 platforms only.
>>>> +    $ref: /schemas/types.yaml#/definitions/string
>>>> +    deprecated: true
>>>> +
>>>> +  ti,no-idle-on-init:
>>>> +    description:
>>>> +      Prevent idling the module at init. This is for legacy omap2/3
>>>> +      platforms only.
>>>> +    type: boolean
>>>> +    deprecated: true
>>>> +
>>>> +patternProperties:
>>>> +#  "@[0-3],[a-f0-9]+$":>> +  "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-fA-F]+(,[0-9a-fA-F]+)*$":
>>
>>>
>>> Why the commented regex. There's no need for a full regex as we already
>>> do that elsewhere. You only need to define the unit-address format.
>>
>> This should be
>>   "@[0-7],[a-f0-9]+$":
>>
>> I added the full regex during debug but forgot to take it off.
>>
>>>
>>>> +    type: object
>>>> +    description: |
>>>> +      The child device node represents the device connected to the GPMC
>>>> +      bus. The device can be a NAND controller, SRAM device, NOR device
>>>> +      or an ASIC.
>>>> +
>>>> +    properties:
>>>> +      compatible:
>>>> +        description:
>>>> +          Compatible of attached device.
>>>
>>> Duh. Drop.
>>>
>>>> +
>>>> +      reg:
>>>> +        items:
>>>> +        - description: Register access space for the device
>>>
>>> A device with 2 register ranges isn't allowed?
>>
>> GPMC is actually a memory controller and we are describing the children here.
> 
> Yes, I understand what it is.
> 
>> Each child has to have a register range.
> 
> What you are saying here with the schema is there is only 1 register
> range allowed for the child node. You don't know how many a child
> device may have. That's a property of the child device. You just need
> 'reg: true' here.

Now I got it. You are right. Thanks for the explanation :)

cheers,
-roger