From 1b0eec3c9f04f9cb9d5e5ceac21da140e69a13f8 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Fri, 8 Apr 2022 12:10:36 +0300 Subject: [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines 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 Signed-off-by: Tudor Ambarus --- arch/arm/dts/at91-sama7g5ek.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/dts/at91-sama7g5ek.dts b/arch/arm/dts/at91-sama7g5ek.dts index 5313c6d160..ee46112b08 100644 --- a/arch/arm/dts/at91-sama7g5ek.dts +++ b/arch/arm/dts/at91-sama7g5ek.dts @@ -667,7 +667,7 @@ ; bias-disable; slew-rate = <0>; - atmel,drive-strength = ; + atmel,drive-strength = ; }; pinctrl_sdmmc0_default: sdmmc0_default { -- 2.39.5