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| author |   Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-10-01 10:24:03 +0200 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-11-07 14:48:37 +0100 |
| commit | 6ea40a3ba93e1b14ffb349e276f9dfefc4334b99 (patch) | |
| tree | f37e804a5eecaa681957ff24739964e7bd0c55e5 /include/linux/mtd/nand.h | |
| parent | mtd: nand: Add a few more timings to nand_sdr_timings (diff) | |
| download | wireguard-linux-6ea40a3ba93e1b14ffb349e276f9dfefc4334b99.tar.xz wireguard-linux-6ea40a3ba93e1b14ffb349e276f9dfefc4334b99.zip | |
mtd: nand: Wait tCCS after a column change
Drivers implementing ->cmd_ctrl() and relying on the default ->cmdfunc()
implementation usually don't wait tCCS when a column change (RNDIN or
RNDOUT) is requested.
Add an option flag to ask the core to do so (note that we keep this as
an opt-in to avoid breaking existing implementations), and make use of
the ->data_interface information is available (otherwise, wait 500ns).
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Diffstat (limited to 'include/linux/mtd/nand.h')
| -rw-r--r-- | include/linux/mtd/nand.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 6fe83bce83a6..970ceb948835 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -210,6 +210,16 @@ enum nand_ecc_algo { */ #define NAND_USE_BOUNCE_BUFFER 0x00100000 +/* + * In case your controller is implementing ->cmd_ctrl() and is relying on the + * default ->cmdfunc() implementation, you may want to let the core handle the + * tCCS delay which is required when a column change (RNDIN or RNDOUT) is + * requested. + * If your controller already takes care of this delay, you don't need to set + * this flag. + */ +#define NAND_WAIT_TCCS 0x00200000 + /* Options set by nand scan */ /* Nand scan has allocated controller struct */ #define NAND_CONTROLLER_ALLOC 0x80000000 |