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mtd: nand: Wait tCCS after a column change

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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>
This commit is contained in:
Boris Brezillon 2016-10-01 10:24:03 +02:00
parent 204e7ecd47
commit 6ea40a3ba9
2 changed files with 35 additions and 1 deletions
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10
include/linux/mtd/nand.h
View file

@ -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