linux-kernel - Re: [PATCH 2/6] dt-bindings: mmc: cdns: match MPFS MMC/SDHCI controller

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Date:   Mon, 30 Aug 2021 10:09:29 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Atish Patra <atish.patra@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Yash Shah <yash.shah@...ive.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Piotr Sroka <piotrs@...ence.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 2/6] dt-bindings: mmc: cdns: match MPFS MMC/SDHCI controller

On Tue, Aug 24, 2021 at 2:02 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> On 24/08/2021 16:33, Rob Herring wrote:
> > On Thu, Aug 19, 2021 at 05:44:32PM +0200, Krzysztof Kozlowski wrote:
> >> The Microchip MPFS Icicle Kit uses Cadence SD/SDIO/eMMC Host Controller
> >> without any additional vendor compatible:
> >
> > I think the lack of vendor compatible is the error here. Experience has
> > shown that vendor specific compatibles are needed for licensed IP.
> >
>
> In such case this could be:
> 1. a specific "microchip,mpfs250t-sd4hc", which
> seems to be on MPFS Icicle Kit:
> https://www.digikey.co.uk/en/product-highlight/m/microchip-technology/mpfs-icicle-kit-es--polarfire-soc-fpga-icicle-kit
>
> 2. or a generic "microchip,mpfs-sd4hc"
>
> Any hints here?

Best for a Microchip person to answer, but sure there's some existing
compatible strings for other blocks on this chip to follow the same
pattern.

Rob