From 21a1bc6a900c33efe4da4cc1b33efcfa543fd9d0 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Fri, 18 Dec 2020 11:43:45 +0100
Subject: [PATCH] ARM: dts: meson: switch TFLASH_VDD_EN pin to open drain on
Odroid-C4
For the proper reboot Odroid-C4 board requires to switch TFLASH_VDD_EN
pin to the high impedance mode, otherwise the board is stuck in the
middle of loading early stages of the bootloader from SD card.
This can be achieved by using the OPEN_DRAIN flag instead if the
ACTIVE_HIGH, what will leave the pin in input to achieve high state (pin
has the pull-up) and solve the issue.
Suggested-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi b/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi
index c431988075..fbcc8287c5 100644
--- a/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi
+++ b/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi
@@ -11,3 +11,7 @@
snps,reset-delays-us = <0 10000 1000000>;
snps,reset-active-low;
};
+
+&tflash_vdd {
+ gpio = <&gpio_ao GPIOAO_3 GPIO_OPEN_DRAIN>;
+};
--
2.39.5