linux/drivers/mtd/nand
Masahiro Yamada 1dfac31a5a mtd: rawnand: denali: optimize timing parameters for data interface
This commit improves the ->setup_data_interface() hook.

The denali_setup_data_interface() needs the frequency of clk_x
and the ratio of clk_x / clk.

The latter is currently hardcoded in the driver, like this:

  #define DENALI_CLK_X_MULT       6

The IP datasheet requires that clk_x / clk be 4, 5, or 6.  I just
chose 6 because it is the most defensive value, but it is not optimal.
By getting the clock rate of both "clk" and "clk_x", the driver can
compute the timing values more precisely.

To not break the existing platforms, the fallback value, 50 MHz is
provided.  It is true for all upstreamed platforms.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Tested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
2018-07-18 09:24:14 +02:00
..
onenand treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
raw mtd: rawnand: denali: optimize timing parameters for data interface 2018-07-18 09:24:14 +02:00
spi mtd: spinand: macronix: Add support for MX35LF2GE4AB 2018-07-18 09:24:12 +02:00
bbt.c mtd: nand: Add core infrastructure to deal with NAND devices 2018-02-16 10:10:53 +01:00
core.c mtd: nand: Fix nanddev_mtd_erase() 2018-04-22 19:59:29 +02:00
Kconfig mtd: nand: Add core infrastructure to support SPI NANDs 2018-07-18 09:24:10 +02:00
Makefile mtd: nand: Add core infrastructure to support SPI NANDs 2018-07-18 09:24:10 +02:00