From 726b6324e36b39788f9cdcb918df48bc4d475268 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 3 Feb 2015 14:07:53 +0100 Subject: mmc: pwrseq: add driver for emmc hardware reset This patch provides a simple mmc-pwrseq-emmc driver, which controls single gpio line. It perform standard eMMC hw reset procedure, as descibed by Jedec 4.4 specification. This procedure is performed just after MMC core enabled power to the given mmc host (to fix possible issues if bootloader has left eMMC card in initialized or unknown state), and before performing complete system reboot (also in case of emergency reboot call). The latter is needed on boards, which doesn't have hardware reset logic connected to emmc card and (limited or broken) ROM bootloaders are unable to read second stage from the emmc card if the card is left in unknown or already initialized state. Signed-off-by: Marek Szyprowski Signed-off-by: Ulf Hansson --- drivers/mmc/core/pwrseq.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/mmc/core/pwrseq.c') diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c index 2cea00e..8623561 100644 --- a/drivers/mmc/core/pwrseq.c +++ b/drivers/mmc/core/pwrseq.c @@ -26,6 +26,9 @@ static struct mmc_pwrseq_match pwrseq_match[] = { { .compatible = "mmc-pwrseq-simple", .alloc = mmc_pwrseq_simple_alloc, + }, { + .compatible = "mmc-pwrseq-emmc", + .alloc = mmc_pwrseq_emmc_alloc, }, }; -- cgit v1.1