Re: [PATCH v6 3/3] arm64:?==?utf-8?q? dts: rockchip: Add Radxa CM5 IO Board

[Dragan Simic]

Hello Naoki,

On Thursday, November 06, 2025 04:17 CET, FUKAUMI Naoki <naoki at radxa.com> wrote:
> On 11/6/25 08:38, FUKAUMI Naoki wrote:
> > On 11/6/25 03:27, Jimmy Hon wrote:
> >> On Tue, Nov 4, 2025 at 11:14 PM FUKAUMI Naoki <naoki at radxa.com> wrote:
> >>>
> >>> The Radxa CM5 IO Board is an application board for the Radxa CM5.
> >>>
> >>> Specification:
> >>
> >>> - 1x microSD card slot
> >>
> >> [ snip ]
> >>
> >>> +
> >>> +&sdmmc {
> >>> +       bus-width = <4>;
> >>> +       cap-mmc-highspeed;
> >>> +       cap-sd-highspeed;
> >>> +       cd-gpios = <&gpio0 RK_PA4 GPIO_ACTIVE_LOW>;
> >>> +       disable-wp;
> >>> +       no-sdio;
> >>> +       pinctrl-names = "default";
> >>> +       pinctrl-0 = <&sdmmc_bus4 &sdmmc_clk &sdmmc_cmd>;
> >>> +       sd-uhs-sdr104;
> >>> +       vmmc-supply = <&vcc_3v3_s3>;
> >>> +       vqmmc-supply = <&vccio_sd_s0>;
> >>> +       status = "okay";
> >>> +};
> >>
> >> When used as a TF slot, shouldn't there be a "no-mmc" also?
> > 
> > We have "eMMC to uSD."
> >   https://radxa.com/products/accessories/emmc-to-usd
> > 
> > [  202.176757] mmc_host mmc1: Bus speed (slot 0) = 49500000Hz (slot req 
> > 52000000Hz, actual 49500000HZ div = 0)
> > [  202.178477] mmc1: new high speed MMC card at address 0001
> > [  202.179534] mmcblk1: mmc1:0001 SLD64G 57.6 GiB
> > [  202.207336] mmcblk1boot0: mmc1:0001 SLD64G 4.00 MiB
> > [  202.210374] mmcblk1boot1: mmc1:0001 SLD64G 4.00 MiB
> > [  202.212967] mmcblk1rpmb: mmc1:0001 SLD64G 4.00 MiB, chardev (511:1)
> > 
> > (I'm not sure why it says "Not work with the SD slot on the board." I 
> > will check.)
> 
> There is no hardware limitation. "eMMC to uSD" should work with microSD 
> card slot on the board.
> 
> That notice means "dts need to be changed".

True, it can work when the microSD slot is put into the hybrid
MMC/microSD mode, which I described in my previous response, but
that's pretty much a hardware hack similar to accessing JTAG
through the microSD slot on Rockchip boards, or to reconfiguring
the USB 3.0 port to work as a native SATA port on the Pine64
Quartz64 SBC.