linux-kernel - [PATCH] earlycon: Remove hardcoded port->uartclk initialization in of_setup

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Message-Id: <3244a776bc8c4c0c8e39cc8daa386b82d50dc86d.1524664120.git.michal.simek@xilinx.com>
Date:   Wed, 25 Apr 2018 15:48:42 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        devicetree@...r.kernel.org, Rob Herring <robherring2@...il.com>,
        matt.redfearn@...s.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.com>
Subject: [PATCH] earlycon: Remove hardcoded port->uartclk initialization in of_setup_earlycon

There is no reason to initialize uartclk to BASE_BAUD * 16 for DT based
systems.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
Tested-by: Matt Redfearn <matt.redfearn@...s.com>
---

It looks like from history that portclk = BASE_BAUD * 16 was setup to
get on calculation on x86 (divisor = 1) but it shouldn't be needed on DT based
system. That's why I think that there is no DT based system which really
requires this line.
---
 drivers/tty/serial/earlycon.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index a24278380fec..c12b1edcdd8e 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -244,7 +244,6 @@ int __init of_setup_earlycon(const struct earlycon_id *match,
 		return -ENXIO;
 	}
 	port->mapbase = addr;
-	port->uartclk = BASE_BAUD * 16;
 
 	val = of_get_flat_dt_prop(node, "reg-offset", NULL);
 	if (val)
-- 
2.17.0