linux-kernel - [PATCH v2] riscv: dts: microchip: mpfs-icicle: Fix serial console

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Message-Id: <01b0aaeb50a960e36077669449a854e5d4c18a83.1629983839.git.geert@linux-m68k.org>
Date:   Thu, 26 Aug 2021 15:19:39 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atish.patra@....com>
Cc:     Bin Meng <bin.meng@...driver.com>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Bin Meng <bmeng.cn@...il.com>
Subject: [PATCH v2] riscv: dts: microchip: mpfs-icicle: Fix serial console

Currently, nothing is output on the serial console, unless
"console=ttyS0,115200n8" or "earlycon" are appended to the kernel
command line.  Enable automatic console selection using
chosen/stdout-path by adding a proper alias, and configure the expected
serial rate.

While at it, add aliases for the other three serial ports, which are
provided on the same micro-USB connector as the first one.

Fixes: 0fa6107eca4186ad ("RISC-V: Initial DTS for Microchip ICICLE board")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Reviewed-by: Bin Meng <bmeng.cn@...il.com>
---
v2:
  - Add Reviewed-by,
  - Rebase on top of 417166ddec020c4e ("riscv: dts: microchip: Add
    ethernet0 to the aliases node"), as requested by Bin.
---
 arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
index baea7d204639a185..b254c60589a1cc8b 100644
--- a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
+++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
@@ -16,10 +16,14 @@ / {
 
 	aliases {
 		ethernet0 = &emac1;
+		serial0 = &serial0;
+		serial1 = &serial1;
+		serial2 = &serial2;
+		serial3 = &serial3;
 	};
 
 	chosen {
-		stdout-path = &serial0;
+		stdout-path = "serial0:115200n8";
 	};
 
 	cpus {
-- 
2.25.1