linux-kernel - Re: [PATCH v5 04/13] dt-bindings: memory-controllers: add canaan k210 sram controller

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Message-ID: <b8b015f0-d16f-8528-719a-1a3f74d9f176@opensource.wdc.com>
Date:   Mon, 11 Jul 2022 08:21:11 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Conor.Dooley@...rochip.com, krzysztof.kozlowski+dt@...aro.org
Cc:     daniel.lezcano@...aro.org, Eugeniy.Paltsev@...opsys.com,
        sam@...nborg.org, daniel@...ll.ch, paul.walmsley@...ive.com,
        vkoul@...nel.org, palmer@...osinc.com, airlied@...ux.ie,
        palmer@...belt.com, aou@...s.berkeley.edu, robh+dt@...nel.org,
        masahiroy@...nel.org, geert@...ux-m68k.org, niklas.cassel@....com,
        dillon.minfei@...il.com, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-riscv@...ts.infradead.org,
        fancer.lancer@...il.com, thierry.reding@...il.com, mail@...chuod.ie
Subject: Re: [PATCH v5 04/13] dt-bindings: memory-controllers: add canaan k210
 sram controller

On 7/11/22 04:39, Conor.Dooley@...rochip.com wrote:
> Damien, Krzysztof,
> 
> I know this particular version has not been posted for all that
> long, but this binding is (functionally) unchanged for a few
> versions now. Are you happy with this approach Damien?
> U-Boot only cares about the compatible & the clocks property,
> not the regs etc.
> 
> I (lazily) tested it in U-Boot with the following diff:

If both the kernel and u-boot still work as expected with this change, I
am OK with it.

> 
> diff --git a/arch/riscv/dts/k210.dtsi b/arch/riscv/dts/k210.dtsi
> index 3cc8379133..314db88340 100644
> --- a/arch/riscv/dts/k210.dtsi
> +++ b/arch/riscv/dts/k210.dtsi
> @@ -82,11 +82,14 @@
>  
>         sram: memory@...00000 {
>                 device_type = "memory";
> +               reg = <0x80000000 0x400000>, /* sram0 4 MiB */
> +                     <0x80400000 0x200000>, /* sram1 2 MiB */
> +                     <0x80600000 0x200000>; /* aisram 2 MiB */
> +               u-boot,dm-pre-reloc;
> +       };
> +
> +       sram_controller: memory-controller {
>                 compatible = "canaan,k210-sram";
> -               reg = <0x80000000 0x400000>,
> -                     <0x80400000 0x200000>,
> -                     <0x80600000 0x200000>;
> -               reg-names = "sram0", "sram1", "aisram";
>                 clocks = <&sysclk K210_CLK_SRAM0>,
>                          <&sysclk K210_CLK_SRAM1>,
>                          <&sysclk K210_CLK_AI>;
> 
> If so, could you queue this for 5.20 please Krzysztof, unless
> you've got concerns about it?
> 
> Thanks,
> Conor.
> 
> On 05/07/2022 22:52, Conor Dooley wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> From: Conor Dooley <conor.dooley@...rochip.com>
>>
>> The k210 U-Boot port has been using the clocks defined in the
>> devicetree to bring up the board's SRAM, but this violates the
>> dt-schema. As such, move the clocks to a dedicated node with
>> the same compatible string & document it.
>>
>> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
>> ---
>>  .../memory-controllers/canaan,k210-sram.yaml  | 52 +++++++++++++++++++
>>  1 file changed, 52 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/canaan,k210-sram.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/canaan,k210-sram.yaml b/Documentation/devicetree/bindings/memory-controllers/canaan,k210-sram.yaml
>> new file mode 100644
>> index 000000000000..f81fb866e319
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/memory-controllers/canaan,k210-sram.yaml
>> @@ -0,0 +1,52 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/memory-controllers/canaan,k210-sram.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Canaan K210 SRAM memory controller
>> +
>> +description:
>> +  The Canaan K210 SRAM memory controller is responsible for the system's 8 MiB
>> +  of SRAM. The controller is initialised by the bootloader, which configures
>> +  its clocks, before OS bringup.
>> +
>> +maintainers:
>> +  - Conor Dooley <conor@...nel.org>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - canaan,k210-sram
>> +
>> +  clocks:
>> +    minItems: 1
>> +    items:
>> +      - description: sram0 clock
>> +      - description: sram1 clock
>> +      - description: aisram clock
>> +
>> +  clock-names:
>> +    minItems: 1
>> +    items:
>> +      - const: sram0
>> +      - const: sram1
>> +      - const: aisram
>> +
>> +required:
>> +  - compatible
>> +  - clocks
>> +  - clock-names
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/k210-clk.h>
>> +    memory-controller {
>> +        compatible = "canaan,k210-sram";
>> +        clocks = <&sysclk K210_CLK_SRAM0>,
>> +                 <&sysclk K210_CLK_SRAM1>,
>> +                 <&sysclk K210_CLK_AI>;
>> +        clock-names = "sram0", "sram1", "aisram";
>> +    };
>> --
>> 2.37.0
>>
> 


-- 
Damien Le Moal
Western Digital Research