From 3a17a5dbf6da14ed835f7014d26ad145872483f1 Mon Sep 17 00:00:00 2001
From: Roman PASSLER <roman.passler@e-bs.at>
Date: Thu, 13 Jun 2024 10:06:15 +0200
Subject: [PATCH] bms-c1 v0.4: Fix CAN sending by deactivating RS485
 transceiver

When using CAN, it is necessary to deactivate the RS485 transceiver. This commit sets the DE and RE_NOT pins to the correct states to deactivate the transceiver as described in chapter "9.4 Device Functional Modes" in the "SN65HVD7x 3.3-V Supply RS-485 With IEC ESD protection" datasheet.
---
 boards/riscv/bms_c1/bms_c1_0_4_0.overlay | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/boards/riscv/bms_c1/bms_c1_0_4_0.overlay b/boards/riscv/bms_c1/bms_c1_0_4_0.overlay
index 37c2077a..dca810e0 100644
--- a/boards/riscv/bms_c1/bms_c1_0_4_0.overlay
+++ b/boards/riscv/bms_c1/bms_c1_0_4_0.overlay
@@ -11,6 +11,14 @@
 	};
 };
 
+&gpio0 {
+	deactivate-rs485 {
+		gpio-hog;
+		gpios = <6 GPIO_ACTIVE_HIGH>, <7 GPIO_ACTIVE_LOW>;
+		output-low;
+	};
+};
+
 &pinctrl {
 	i2c0_default: i2c0_default {
 		group1 {