From 1a7422ebd092342fa1f4d420eb4642b0134f36ca Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@arm.com>
Date: Mon, 15 Jul 2019 18:07:51 +0100
Subject: [PATCH] rpi4: Add stdout-path to device tree
Some device tree users like to find a pointer to the standard serial
console in the device tree, in the "stdout-path" property of the /chosen
node.
Add the location of the Mini UART in that property, so that DT users are
happy, for instance Linux' earlycon detection.
Change-Id: I178e55016e5640de5ab0bc6e061944bd3583ea96
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
plat/rpi/rpi4/rpi4_bl31_setup.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/plat/rpi/rpi4/rpi4_bl31_setup.c b/plat/rpi/rpi4/rpi4_bl31_setup.c
index 39aa3e45d..53ab0c2e2 100644
--- a/plat/rpi/rpi4/rpi4_bl31_setup.c
+++ b/plat/rpi/rpi4/rpi4_bl31_setup.c
@@ -255,6 +255,9 @@ static void rpi4_prepare_dtb(void)
gic_int_prop[2] = cpu_to_fdt32(0x0f04); // all cores, level high
fdt_setprop(dtb, offs, "interrupts", gic_int_prop, 12);
+ offs = fdt_path_offset(dtb, "/chosen");
+ fdt_setprop_string(dtb, offs, "stdout-path", "serial0");
+
ret = fdt_pack(dtb);
if (ret < 0)
ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, ret);
--
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