[PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines

Eugen.Hristev at microchip.com Eugen.Hristev at microchip.com
Wed Apr 27 08:08:43 CEST 2022


On 4/8/22 12:10 PM, Tudor Ambarus wrote:
> The impedance of the QSPI PCB lines on the sama7g5ek is 50 Ohms.
> Align the output impedance of the QSPI0 HSIOs by setting a medium drive
> strength which corresponds to an impedance of 56 Ohms when VDD is in the
> 3.0V - 3.6V range. The high drive strength setting corresponds to an
> output impedance of 42 Ohms on the QSPI0 HSIOs.
> This is just a fine tunning. The memory that we have populated on sama7g5ek
> works fine even with high drive strength, but it's better to adjust it and
> use medium instead, in case some other flashes with higher frequencies are
> tested.
> 
> Suggested-by: Mihai Sain <mihai.sain at microchip.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus at microchip.com>
> ---

Applied to u-boot-at91/master, thanks !


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