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This article will explain in detail how to configure the DTS of Rockchip RK3399 SDIO. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

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DTS configuration instructions for SDIO

(1) clock-frequency = clock-freq-min-max =

These two items are the same as the configuration of SD card, and the maximum operating frequency does not exceed 150Mhz.

(2) supports-SDIO

This configuration identifies this slot as a SDIO feature and must be added. Otherwise, the SDIO peripheral cannot be initialized.

(3) bus-width =

This configuration is the same as the SD card function.

(4) cap-sd-highspeed

This configuration is the same as the SD card function, as a SDIO peripheral, there is also a SDIO peripheral that distinguishes whether it is highspeed or not.

(5) cap-sdio-irq

This configuration identifies whether the SDIO peripheral (usually Wifi) supports sdio interrupts. If your peripheral is OOB interrupts, please do not add this item. Please contact the original manufacturer of Wifi to determine which type of interruption is supported.

(6) keep-power-in-suspend

This configuration indicates whether sleep without power outage is supported. Please add this option by default. Wifi generally has a deep awakening requirement.

(7) mmc-pwrseq =

This item is the power control of SDIO peripherals (usually Wifi). Is required, otherwise Wifi will not be able to power on. Please refer to the following example, crystal oscillator clock and reset-the choice of enabled GPIO is configured according to the actual board-level hardware requirements.

(8) non-removable

This item indicates that the slot is not removable. This item must be added.

(9) num-slots =

This is the same as the configuration of the SD card.

(10) pinctrl-names = "default"

Pinctrl-0 =

This configures the IOMUX function of the SDIO circuit and is a must.

(11) sd-uhs-sdr104

This configuration determines whether the SDIO device supports SDIO3.0 mode. The premise is that the IO voltage of the Wifi is 1.8v.

This is the end of the article on "how to configure the DTS of Rockchip RK3399 SDIO". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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