linux-kernel - Re: [PATCH v4 2/7] dt-bindings: memory: lpddr2: Convert to schema

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Message-ID: <6b8f6ef7-cfc5-3a8b-d44d-f4080a85ecf3@canonical.com>
Date:   Wed, 6 Oct 2021 12:57:01 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v4 2/7] dt-bindings: memory: lpddr2: Convert to schema

On 06/10/2021 01:00, Dmitry Osipenko wrote:
> Convert LPDDR2 binding to schema. I removed obsolete ti,jedec-lpddr2-*
> compatibles since they were never used by device-trees and by the code.
> 
> Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../memory-controllers/ddr/jedec,lpddr2.yaml  | 195 ++++++++++++++++++
>  .../memory-controllers/ddr/lpddr2.txt         | 102 ---------
>  2 files changed, 195 insertions(+), 102 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
>  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/lpddr2.txt
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
> new file mode 100644
> index 000000000000..d99ccad54938
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
> @@ -0,0 +1,195 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LPDDR2 SDRAM compliant to JEDEC JESD209-2
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzk@...nel.org>

My Canonical address please, so:
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - Elpida,ECB240ABACN
> +          - enum:
> +              - jedec,lpddr2-s4
> +      - items:
> +          - enum:
> +              - jedec,lpddr2-s2
> +      - items:
> +          - enum:
> +              - jedec,lpddr2-nvm
> +
> +  density:
> +    description: |
> +      Density in megabits of SDRAM chip. Obtained from device datasheet.

You need here a type/ref, so uint32.

> +    enum:
> +      - 64
> +      - 128
> +      - 256
> +      - 512
> +      - 1024
> +      - 2048
> +      - 4096
> +      - 8192
> +      - 16384
> +      - 32768
> +
> +  io-width:
> +    description: |
> +      IO bus width in bits of SDRAM chip. Obtained from device datasheet.

You need here a type/ref, so uint32.

> +    enum:
> +      - 32
> +      - 16
> +      - 8
> +
> +  tRRD-min-tck:
> +    maximum: 16

Here and further type is needed.


> +    description: |
> +      Active bank a to active bank b in terms of number of clock cycles.
> +      Obtained from device datasheet.
> +
> +  tWTR-min-tck:
> +    maximum: 16
> +    description: |
> +      Internal WRITE-to-READ command delay in terms of number of clock cycles.
> +      Obtained from device datasheet.
> +

Best regards,
Krzysztof