MIPS: SEAD3: Probe UARTs using DT

Probe the UARTs on SEAD3 boards using device tree rather than platform
code, in order to reduce the amount of the latter. This requires that
CONFIG_SERIAL_OF_PLATFORM be enabled, so enable it in sead3_defconfig.
The SEAD3 DT shim code is extended to read bootloader environment
variables to determine the appropriate UART & mode for kernel console
output & set the stdout-path property of the chosen node accordingly.

In contrast to the old platform code, which appears to have only ever
set "console=ttyS0,38400n8r" with the code in console_config never
having an effect, this will honor the "yamontty" environment variable to
select between the 2 UARTs on the board and then check the "modetty0" or
"modetty1" variable as appropriate to determine the UART configuration.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14048/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 46 deletions

diff --git a/arch/mips/mti-sead3/sead3-init.c b/arch/mips/mti-sead3/sead3-init.c
index 3572ea30173e..e81f5b7657f0 100644
--- a/arch/mips/mti-sead3/sead3-init.c
+++ b/arch/mips/mti-sead3/sead3-init.c
@@ -17,47 +17,6 @@
 extern char except_vec_nmi;
 extern char except_vec_ejtag_debug;
 
-#ifdef CONFIG_SERIAL_8250_CONSOLE
-static void __init console_config(void)
-{
-	char console_string[40];
-	int baud = 0;
-	char parity = '\0', bits = '\0', flow = '\0';
-	char *s;
-
-	if ((strstr(fw_getcmdline(), "console=")) == NULL) {
-		s = fw_getenv("modetty0");
-		if (s) {
-			while (*s >= '0' && *s <= '9')
-				baud = baud*10 + *s++ - '0';
-			if (*s == ',')
-				s++;
-			if (*s)
-				parity = *s++;
-			if (*s == ',')
-				s++;
-			if (*s)
-				bits = *s++;
-			if (*s == ',')
-				s++;
-			if (*s == 'h')
-				flow = 'r';
-		}
-		if (baud == 0)
-			baud = 38400;
-		if (parity != 'n' && parity != 'o' && parity != 'e')
-			parity = 'n';
-		if (bits != '7' && bits != '8')
-			bits = '8';
-		if (flow == '\0')
-			flow = 'r';
-		sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
-			parity, bits, flow);
-		strcat(fw_getcmdline(), console_string);
-	}
-}
-#endif
-
 static void __init mips_nmi_setup(void)
 {
 	void *base;
@@ -140,11 +99,6 @@ void __init prom_init(void)
 	else if ((strstr(fw_getcmdline(), "console=ttyS1")) != NULL)
 		fw_init_early_console(1);
 #endif
-#ifdef CONFIG_SERIAL_8250_CONSOLE
-	if ((strstr(fw_getcmdline(), "console=")) == NULL)
-		strcat(fw_getcmdline(), " console=ttyS0,38400n8r");
-	console_config();
-#endif
 }
 
 void __init prom_free_prom_memory(void)