linux-kernel - Re: [PATCH 5/6] riscv: microchip: mpfs: drop duplicated MMC/SDHC node

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Message-ID: <feb9b49b-9e5d-1459-f177-21b3c2ae4add@canonical.com>
Date:   Tue, 24 Aug 2021 21:07:14 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Atish Patra <atish.patra@....com>,
        Yash Shah <yash.shah@...ive.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Piotr Sroka <piotrs@...ence.com>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 5/6] riscv: microchip: mpfs: drop duplicated MMC/SDHC node

On 24/08/2021 17:37, Geert Uytterhoeven wrote:
> Hi Krzysztof,
> 
> On Thu, Aug 19, 2021 at 5:45 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@...onical.com> wrote:
>> Devicetree source is a description of hardware and hardware has only one
>> block @20008000 which can be configured either as eMMC or SDHC.  Having
>> two node for different modes is an obscure, unusual and confusing way to
>> configure it.  Instead the board file is supposed to customize the block
>> to its needs, e.g. to SDHC mode.
>>
>> This fixes dtbs_check warning:
>>   arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dt.yaml: sdhc@...08000: $nodename:0: 'sdhc@...08000' does not match '^mmc(@.*)?$'
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> 
> Thanks for your patch!
> 
>> --- a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
>> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
>> @@ -43,8 +43,16 @@ &serial3 {
>>         status = "okay";
>>  };
>>
>> -&sdcard {
>> +&mmc {
>>         status = "okay";
>> +
>> +       disable-wp;
>> +       cap-sd-highspeed;
>> +       card-detect-delay = <200>;
>> +       sd-uhs-sdr12;
>> +       sd-uhs-sdr25;
>> +       sd-uhs-sdr50;
>> +       sd-uhs-sdr104;
>>  };
>>
>>  &emac0 {
>> diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
>> index cb54da0cc3c4..c4ccd7e4d3eb 100644
>> --- a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
>> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
>> @@ -262,25 +262,7 @@ serial3: serial@...04000 {
>>                         status = "disabled";
>>                 };
>>
>> -               emmc: mmc@...08000 {
>> -                       compatible = "cdns,sd4hc";
>> -                       reg = <0x0 0x20008000 0x0 0x1000>;
>> -                       interrupt-parent = <&plic>;
>> -                       interrupts = <88 89>;
> 
> Note that the other node has only a single interrupt.
> Which one is correct?

I assume the one put there initially, since it was tested (sdcard wsas
enabled, emmc was disabled).

> 
>> -                       pinctrl-names = "default";
>> -                       clocks = <&clkcfg 6>;
>> -                       bus-width = <4>;
>> -                       cap-mmc-highspeed;
>> -                       mmc-ddr-3_3v;
>> -                       max-frequency = <200000000>;
>> -                       non-removable;
>> -                       no-sd;
>> -                       no-sdio;
>> -                       voltage-ranges = <3300 3300>;
>> -                       status = "disabled";
>> -               };
>> -
>> -               sdcard: sdhc@...08000 {
>> +               mmc: mmc@...08000 {
>>                         compatible = "cdns,sd4hc";
>>                         reg = <0x0 0x20008000 0x0 0x1000>;
>>                         interrupt-parent = <&plic>;
>> @@ -288,13 +270,6 @@ sdcard: sdhc@...08000 {
>>                         pinctrl-names = "default";
>>                         clocks = <&clkcfg 6>;
>>                         bus-width = <4>;
> 
> I think bus-width should be moved to the board .dts, too.

Makes sense. Thanks for review!


Best regards,
Krzysztof