linux-kernel - Re: [PATCH 8/8] arm64: dts: rockchip: Enable SD-card interface on Radxa E20C

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Message-ID: <Z8dcRjPcbKqEyKdT@pie.lan>
Date: Tue, 4 Mar 2025 20:02:14 +0000
From: Yao Zi <ziyao@...root.org>
To: Jonas Karlman <jonas@...boo.se>, Chukun Pan <amadeus@....edu.cn>
Cc: conor+dt@...nel.org, cristian.ciocaltea@...labora.com,
	detlev.casanova@...labora.com, devicetree@...r.kernel.org,
	frank.wang@...k-chips.com, heiko@...ech.de, krzk+dt@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 8/8] arm64: dts: rockchip: Enable SD-card interface on
 Radxa E20C

On Tue, Mar 04, 2025 at 08:55:36PM +0100, Jonas Karlman wrote:
> Hi Yao Zi,
> 
> On 2025-03-04 20:49, Yao Zi wrote:
> > On Tue, Mar 04, 2025 at 08:10:36PM +0800, Chukun Pan wrote:
> >> Hi,
> >>
> >>> +	aliases {
> >>> +		mmc0 = &sdmmc;
> >>
> >> s/mmc0/mmc1
> > 
> > Will take it and add the missing pinctrl, as Jonas already pointed out.
> > 
> >>> +&sdmmc {
> >>> +	bus-width = <4>;
> >>> +	cap-mmc-highspeed;
> >>> +	cap-sd-highspeed;
> >>
> >> I think for sdcard, only cap-sd-highspeed
> >> is needed, not cap-mmc-highspeed?
> > 
> > This makes sense, will remove it in the next version.
> 
> Please do not remove the cap-mmc-highspeed prop, I tested the controller
> with a microSD to eMMC adapter and MMC HS speed is supported:
> 
>   mmc1: card 59b4 removed
>   mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
>   mmc_host mmc1: Bus speed (slot 0) = 49800000Hz (slot req 52000000Hz, actual 49800000HZ div = 0)
>   mmc1: new high speed MMC card at address 0001
>   mmcblk1: mmc1:0001 DG4008 7.28 GiB
>    mmcblk1: p1 p2
>   mmcblk1boot0: mmc1:0001 DG4008 4.00 MiB
>   mmcblk1boot1: mmc1:0001 DG4008 4.00 MiB
>   mmcblk1rpmb: mmc1:0001 DG4008 4.00 MiB, chardev (499:0)
> 
>   ~ # cat /sys/kernel/debug/mmc1/ios
>   clock:          52000000 Hz
>   vdd:            21 (3.3 ~ 3.4 V)
>   bus mode:       2 (push-pull)
>   chip select:    0 (don't care)
>   power mode:     2 (on)
>   bus width:      2 (4 bits)
>   timing spec:    1 (mmc high-speed)
>   signal voltage: 0 (3.30 V)
>   driver type:    0 (driver type B)

Oops, indeed, I didn't expect the adapted usecase and thought only
sdcards could be connected through the interface.

> Regards,
> Jonas

Thanks for the correction,
Yao Zi