Messages in this thread Patch in this message | | | From | Tudor Ambarus <> | Subject | [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines | Date | Wed, 6 Apr 2022 16:05:05 +0300 |
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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.
Suggested-by: Mihai Sain <mihai.sain@microchip.com> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> --- arch/arm/boot/dts/at91-sama7g5ek.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-sama7g5ek.dts index 08685a10eda1..8f9643170ba3 100644 --- a/arch/arm/boot/dts/at91-sama7g5ek.dts +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts @@ -655,7 +655,7 @@ pinctrl_qspi: qspi { <PIN_PB21__QSPI0_INT>; bias-disable; slew-rate = <0>; - atmel,drive-strength = <ATMEL_PIO_DRVSTR_HI>; + atmel,drive-strength = <ATMEL_PIO_DRVSTR_ME>; }; pinctrl_sdmmc0_default: sdmmc0_default { -- 2.25.1
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