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-rw-r--r--target/linux/brcm2708/patches-4.4/0554-BCM270X_DT-Update-UART0-clock-frequency.patch29
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0554-BCM270X_DT-Update-UART0-clock-frequency.patch b/target/linux/brcm2708/patches-4.4/0554-BCM270X_DT-Update-UART0-clock-frequency.patch
new file mode 100644
index 0000000000..cdb83ff83b
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0554-BCM270X_DT-Update-UART0-clock-frequency.patch
@@ -0,0 +1,29 @@
+From 86533bf4f40251f9468a4f48775aa2cf1a37d6b7 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Sun, 27 Nov 2016 21:45:55 +0000
+Subject: [PATCH] BCM270X_DT: Update UART0 clock-frequency
+
+The Raspberry Pi firmware now sets the UART0 clock frequency to
+48MHz (was 3MHz), to allow for baudrates up to 3MHz. This value
+is overwritten by the firmware, but alternative loaders such
+as U-Boot ignore the firmware-provided DTB. And besides, the
+default ought to be correct.
+
+See: https://github.com/raspberrypi/linux/issues/1732
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ arch/arm/boot/dts/bcm2708_common.dtsi | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/arm/boot/dts/bcm2708_common.dtsi
++++ b/arch/arm/boot/dts/bcm2708_common.dtsi
+@@ -456,7 +456,7 @@
+ reg = <2>;
+ #clock-cells = <0>;
+ clock-output-names = "uart0_pclk";
+- clock-frequency = <3000000>;
++ clock-frequency = <48000000>;
+ };
+
+ clk_apb_p: clock@3 {