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

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Date:   Wed, 6 Apr 2022 16:05:05 +0300
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <nicolas.ferre@...rochip.com>, <claudiu.beznea@...rochip.com>
CC:     <alexandre.belloni@...tlin.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Tudor Ambarus" <tudor.ambarus@...rochip.com>,
        Mihai Sain <mihai.sain@...rochip.com>
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.

Suggested-by: Mihai Sain <mihai.sain@...rochip.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.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