From f87ac6fa4a14fb9202232ee1c26ae797d1304f91 Mon Sep 17 00:00:00 2001
From: Justin Schneck <jschneck@mac.com>
Date: Sat, 20 Feb 2021 17:41:28 -0500
Subject: [PATCH] limit speed of sdmmc1 to 48Mhz

The WILC3000 seems to struggle with transferring large
files when operating at max speed at 50Mhz. The driver
would stop working and result in an error message

cfg_indicate_rx: Receive unknown message

After this message the wifi no longer functions.
---
 arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts b/arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts
index 56645bf6f..ae6328a3e 100644
--- a/arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts
+++ b/arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts
@@ -216,6 +216,11 @@
 	status = "okay";
 };
 
+&sdmmc1 {
+	max-frequency=<4800000>;
+	status = "okay";
+};
+
 &shutdown_controller {
 	atmel,shdwc-debouncer = <976>;
 	atmel,wakeup-rtc-timer;
-- 
2.25.1