On 3/28/23 11:15, Tudor Ambarus wrote:
> From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
>
cut
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
I don't understand why these differ. On my local machine I see them match:
commit e208a7b04cbde950588c561889d2f8eb8a10485f
Author: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
Date: Thu Nov 17 12:52:46 2022 +0200
ARM: dts: at91-sama5d27_wlsom1: Set sst26vf064b SPI NOR flash at its
maximum frequency
sama5d27-wlsom1 populates an sst26vf064b SPI NOR flash. Its maximum
operating frequency for 2.7-3.6V is 104 MHz. As the flash is operated
at 3.3V, increase its maximum supported frequency to 104MHz. The
increasing of the spi-max-frequency value requires the setting of the
"CE# Not Active Hold Time", thus set the spi-cs-setup-ns to a value
of 7.
The sst26vf064b datasheet specifies just a minimum value for the
"CE# Not Active Hold Time" and it advertises it to 5 ns. There's no
maximum time specified. I determined experimentally that 5 ns for the
spi-cs-setup-ns is not enough when the flash is operated close to its
maximum frequency and tests showed that 7 ns is just fine, so set the
spi-cs-setup-ns dt property to 7.
With the increase of frequency the reads are now faster with ~37%.
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
Anyway, you can keep v2 then, looks like v2 has the same email on both
the author line and the S-o-b line. It's fine by me even if it is with
@microchip.com:
https://lore.kernel.org/all/20230328100723.1593864-2-tudor.ambarus@xxxxxxxxxx/
