linux-kernel - Re: [PATCH v4 1/3] dt-bindings: mmc: Add Sparx5 SDHCI controller bindings

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Message-ID: <87blizxe3x.fsf@soft-dev15.microsemi.net>
Date:   Tue, 25 Aug 2020 11:35:14 +0200
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     Ulf Hansson <ulf.hansson@...aro.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "SoC Team" <soc@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        "Microchip Linux Driver Support" <UNGLinuxDriver@...rochip.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: mmc: Add Sparx5 SDHCI controller bindings


Alexandre Belloni writes:

> On 25/08/2020 09:33:45+0200, Ulf Hansson wrote:
>> On Mon, 24 Aug 2020 at 17:10, Lars Povlsen <lars.povlsen@...rochip.com> wrote:
>> >
>> > The Sparx5 SDHCI controller is based on the Designware controller IP.
>> >
>> > Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
>> > ---
>> >  .../mmc/microchip,dw-sparx5-sdhci.yaml        | 65 +++++++++++++++++++
>> >  1 file changed, 65 insertions(+)
>> >  create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
>> >
>> > diff --git a/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
>> > new file mode 100644
>> > index 0000000000000..55883290543b9
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
>> > @@ -0,0 +1,65 @@
>> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> > +%YAML 1.2
>> > +---
>> > +$id: http://devicetree.org/schemas/mmc/microchip,dw-sparx5-sdhci.yaml#
>> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> > +
>> > +title: Microchip Sparx5 Mobile Storage Host Controller Binding
>> > +
>> > +allOf:
>> > +  - $ref: "mmc-controller.yaml"
>> > +
>> > +maintainers:
>> > +  - Lars Povlsen <lars.povlsen@...rochip.com>
>> > +
>> > +# Everything else is described in the common file
>> > +properties:
>> > +  compatible:
>> > +    const: microchip,dw-sparx5-sdhci
>> > +
>> > +  reg:
>> > +    maxItems: 1
>> > +
>> > +  interrupts:
>> > +    maxItems: 1
>> > +
>> > +  clocks:
>> > +    maxItems: 1
>> > +    description:
>> > +      Handle to "core" clock for the sdhci controller.
>> > +
>> > +  clock-names:
>> > +    items:
>> > +      - const: core
>> > +
>> > +  microchip,clock-delay:
>> > +    description: Delay clock to card to meet setup time requirements.
>> > +      Each step increase by 1.25ns.
>> > +    $ref: "/schemas/types.yaml#/definitions/uint32"
>> > +    minimum: 1
>> > +    maximum: 15
>> > +
>> > +required:
>> > +  - compatible
>> > +  - reg
>> > +  - interrupts
>> > +  - clocks
>> > +  - clock-names
>> > +
>> > +examples:
>> > +  - |
>> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> > +    #include <dt-bindings/clock/microchip,sparx5.h>
>> > +    sdhci0: mmc@...800000 {
>>
>> Nitpick:
>>
>> I think we should use solely "mmc[n]" here. So:
>>
>> mmc0@...800000 {
>>
>> Please update patch3/3 accordingly as well.
>
> This is not what the devicetree specification says. 2.2.2 says that the
> generic name is mmc, not mmc[n]. Since there is a proper unit-address, I
> don't see the need for an index here.
>

Alex,

Yeah, I thought so as well - and the existing DTs have practically all
variations..

Nevertheless, I followed suit since I had to refresh the patch set
anyhow.

Cheers,

---Lars

-- 
Lars Povlsen,
Microchip