The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mmc/mmc-pwrseq-emmc.txt

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    1 * The simple eMMC hardware reset provider
    2 
    3 The purpose of this driver is to perform standard eMMC hw reset
    4 procedure, as described by Jedec 4.4 specification. This procedure is
    5 performed just after MMC core enabled power to the given mmc host (to
    6 fix possible issues if bootloader has left eMMC card in initialized or
    7 unknown state), and before performing complete system reboot (also in
    8 case of emergency reboot call). The latter is needed on boards, which
    9 doesn't have hardware reset logic connected to emmc card and (limited or
   10 broken) ROM bootloaders are unable to read second stage from the emmc
   11 card if the card is left in unknown or already initialized state.
   12 
   13 Required properties:
   14 - compatible : contains "mmc-pwrseq-emmc".
   15 - reset-gpios : contains a GPIO specifier. The reset GPIO is asserted
   16         and then deasserted to perform eMMC card reset. To perform
   17         reset procedure as described in Jedec 4.4 specification, the
   18         gpio line should be defined as GPIO_ACTIVE_LOW.
   19 
   20 Example:
   21 
   22         sdhci0_pwrseq {
   23                 compatible = "mmc-pwrseq-emmc";
   24                 reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
   25         }

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