linux-kernel - Re: [linux-sunxi] [PATCH 1/3] arm64: dts: allwinner: a64: olinuxino: Fix eMMC supply regulator

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Date:   Fri, 29 Nov 2019 11:49:51 +0200
From:   Stefan Mavrodiev <stefan@...mex.com>
To:     wens@...nel.org, Stefan Mavrodiev <stefan@...mex.com>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 1/3] arm64: dts: allwinner: a64: olinuxino:
 Fix eMMC supply regulator


On 11/29/19 11:26 AM, Chen-Yu Tsai wrote:
> On Fri, Nov 29, 2019 at 5:14 PM Stefan Mavrodiev <stefan@...mex.com> wrote:
>> A64-OLinuXino-eMMC uses 1.8V for eMMC supply. This is done via a triple
>> jumper, which sets VCC-PL to either 1.8V or 3.3V. This setting is different
>> for boards with and without eMMC.
>>
>> This is not a big issue for DDR52 mode, however the eMMC will not work in
>> HS200/HS400, since these modes explicitly requires 1.8V.
>>
>> Signed-off-by: Stefan Mavrodiev <stefan@...mex.com>
>> ---
>>   arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino-emmc.dts | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino-emmc.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino-emmc.dts
>> index 96ab0227e82d..7d135decbd53 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino-emmc.dts
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino-emmc.dts
>> @@ -14,8 +14,8 @@
>>   &mmc2 {
>>          pinctrl-names = "default";
>>          pinctrl-0 = <&mmc2_pins>;
>> -       vmmc-supply = <&reg_dcdc1>;
>> -       vqmmc-supply = <&reg_dcdc1>;
>> +       vmmc-supply = <&reg_eldo1>;
> If I'm reading the schematics correctly, VCC on the eMMC is from 3.3V.
> This corresponds to the vmmc-supply property. So you shouldn't change it.

My bad. Don't know how I've missed that.

Stefan

>
>> +       vqmmc-supply = <&reg_eldo1>;
> vqmmc-supply is from the VCC-PC rail, which is the one you say is triple-
> jumpered. So this change makes sense.
>
> ChenYu
>