SD card device setting in LS1021a

[szlin]

TWR-LS1021A equips SD card; however, the esdhc function is disabled in 1021a.dtsi and there is no overwrite setting in ls1021a-twr.dts.

But the SD function works well in TWR board, could you clarify this point?

[Pavel]

The LS1021a-twr.dts file contains the following:

                               esdhc@1560000 {

                                               compatible = "fsl,ls1021a-esdhc", "fsl,esdhc";

                                               reg = <0x0 0x1560000 0x0 0x10000>;

                                               interrupts = <0x0 0x5e 0x4>;

                                               clock-frequency = <0x0>;

                                               voltage-ranges = <0x708 0x708 0xce4 0xce4>;

                                               sdhci,auto-cmd12;

                                               big-endian;

                                               bus-width = <0x4>;

                                               rcpm-wakeup = <0x3 0x80 0x0>;

                                               status = "disabled";

                               };

“disabled” - Indicates that the device is not presently operational, but it might become operational in the future (for example, something is not plugged in, or switched off).

Refer to the device binding for details on what disabled means for a given device.

See the following document:

http://elinux.org/images/c/cf/Power_ePAPR_APPROVED_v1.1.pdf

It is correct status for SDHC since often SD card is not plugged in.

Have a great day,
Pavel Chubakov

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