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

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Date:   Mon, 6 Sep 2021 08:38:11 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <robh@...nel.org>, <krzysztof.kozlowski@...onical.com>
CC:     <atish.patra@....com>, <ulf.hansson@...aro.org>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <geert+renesas@...der.be>,
        <yash.shah@...ive.com>, <yamada.masahiro@...ionext.com>,
        <piotrs@...ence.com>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 2/6] dt-bindings: mmc: cdns: match MPFS MMC/SDHCI
 controller

On 30/08/2021 16:09, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> 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

#2 would be ideal since the controller doesn't change across the part 
range, the 250t bit in the part name just covers the size/configuration 
of the FPGA.

Conor

>
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