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| author | Chao Fu <B44548@freescale.com> | 2014-09-29 05:58:00 (GMT) |
|---|---|---|
| committer | Matthew Weigel <Matthew.Weigel@freescale.com> | 2014-12-11 18:37:28 (GMT) |
| commit | b77452e4557346fe6a2b715f8033a4f2549b7a72 (patch) | |
| tree | e081a5cac929b4281f408c9b97544f43b87d3b10 /Documentation | |
| parent | cdbd6a3f41ff52225e07d72a0dd980d6c035bacc (diff) | |
| download | linux-fsl-qoriq-b77452e4557346fe6a2b715f8033a4f2549b7a72.tar.xz | |
mtd: spi-nor: add DDR quad read support
This patch adds the DDR quad read support by the following:
[1] add SPI_NOR_DDR_QUAD read mode.
[2] add DDR Quad read opcodes:
SPINOR_OP_READ_1_4_4_D / SPINOR_OP_READ4_1_4_4_D
[3] add set_ddr_quad_mode() to initialize for the DDR quad read.
Currently it only works for Spansion NOR.
[3] about the dummy cycles.
We set the dummy with 8 for DDR quad read by default.
The m25p80.c can not support the DDR quad read, but the SPI NOR controller
can set the dummy value in its child DT node, and the SPI NOR framework
can parse it out.
Test this patch for Spansion s25fl128s NOR flash.
Signed-off-by: Huang Shijie <b32955@freescale.com>
The upstream status of this patch can be found at: https://patchwork.kernel.org/patch/4074961
Change-Id: Id67e247e357bdd8bea99816e31f603898671d968
Reviewed-on: http://git.am.freescale.net:8181/20125
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>
Tested-by: Zhengxiong Jin <Jason.Jin@freescale.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions