diff options
| author | Joonyoung Shim <jy0922.shim@samsung.com> | 2015-01-15 11:45:56 +0900 |
|---|---|---|
| committer | Minkyu Kang <mk7.kang@samsung.com> | 2015-02-13 17:17:10 +0900 |
| commit | aa8e00fab5e65a07c2cae52274946a908805ea60 (patch) | |
| tree | 2309916e5a3205abcdf476fb7e36adce1d847995 /board/samsung/common/board.c | |
| parent | a276172cf32386c211c75638f6bf3c0d59ba03ba (diff) | |
samsung: board: support eMMC reset using DT
Some exynos boards require special handling of nRESET_OUT line for eMMC
memory to perform complete reboot e.g. Odroid X2/U3/XU3 boards.
This will support eMMC reset using DT from reset_misc of samsung common
board file.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Diffstat (limited to 'board/samsung/common/board.c')
| -rw-r--r-- | board/samsung/common/board.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c index 8b4c8e9a9d..da2245ff9d 100644 --- a/board/samsung/common/board.c +++ b/board/samsung/common/board.c @@ -355,3 +355,31 @@ int misc_init_r(void) return 0; } #endif + +void reset_misc(void) +{ + struct gpio_desc gpio = {}; + int node; + + node = fdt_node_offset_by_compatible(gd->fdt_blob, 0, + "samsung,emmc-reset"); + if (node < 0) + return; + + gpio_request_by_name_nodev(gd->fdt_blob, node, "reset-gpio", 0, &gpio, + GPIOD_IS_OUT); + + if (dm_gpio_is_valid(&gpio)) { + /* + * Reset eMMC + * + * FIXME: Need to optimize delay time. Minimum 1usec pulse is + * required by 'JEDEC Standard No.84-A441' (eMMC) + * document but real delay time is expected to greater + * than 1usec. + */ + dm_gpio_set_value(&gpio, 0); + mdelay(10); + dm_gpio_set_value(&gpio, 1); + } +} |