linux-kernel - [PATCH v11 1/4] of/serial: move earlycon early

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Date:   Tue, 27 Sep 2016 23:54:12 +0300
From:   Aleksey Makarov <aleksey.makarov@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-serial@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        Russell King <linux@....linux.org.uk>,
        Len Brown <lenb@...nel.org>,
        Leif Lindholm <leif.lindholm@...aro.org>,
        Graeme Gregory <graeme.gregory@...aro.org>,
        Al Stone <ahs3@...hat.com>,
        Christopher Covington <cov@...eaurora.org>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Zheng, Lv" <lv.zheng@...el.com>, Mark Salter <msalter@...hat.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Jiri Slaby <jslaby@...e.com>, devicetree@...r.kernel.org
Subject: [PATCH v11 1/4] of/serial: move earlycon early_param handling to serial

From: Leif Lindholm <leif.lindholm@...aro.org>

We have multiple "earlycon" early_param handlers - merge the DT one into
the main earlycon one.  It's a cleanup that also will be useful
to defer setting up DT console until ACPI/DT decision is made.

Rename the exported function to avoid clashing with the function from
arch/microblaze/kernel/prom.c

Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
Acked-by: Rob Herring <robh@...nel.org>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Peter Hurley <peter@...leysoftware.com>
Tested-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Tested-by: Christopher Covington <cov@...eaurora.org>
---
 drivers/of/fdt.c              | 11 +----------
 drivers/tty/serial/earlycon.c |  2 +-
 include/linux/of_fdt.h        |  3 +++
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 085c638..c89d5d2 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -924,7 +924,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
 
 #ifdef CONFIG_SERIAL_EARLYCON
 
-static int __init early_init_dt_scan_chosen_serial(void)
+int __init early_init_dt_scan_chosen_stdout(void)
 {
 	int offset;
 	const char *p, *q, *options = NULL;
@@ -968,15 +968,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
 	}
 	return -ENODEV;
 }
-
-static int __init setup_of_earlycon(char *buf)
-{
-	if (buf)
-		return 0;
-
-	return early_init_dt_scan_chosen_serial();
-}
-early_param("earlycon", setup_of_earlycon);
 #endif
 
 /**
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 067783f..7aae655 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
 	 * don't generate a warning from parse_early_params() in that case
 	 */
 	if (!buf || !buf[0])
-		return 0;
+		return early_init_dt_scan_chosen_stdout();
 
 	err = setup_earlycon(buf);
 	if (err == -ENOENT || err == -EALREADY)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 26c3302..4341f32 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -14,6 +14,7 @@
 
 #include <linux/types.h>
 #include <linux/init.h>
+#include <linux/errno.h>
 
 /* Definitions used by the flattened device tree */
 #define OF_DT_HEADER		0xd00dfeed	/* marker */
@@ -66,6 +67,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
 				     int depth, void *data);
 extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
 				     int depth, void *data);
+extern int early_init_dt_scan_chosen_stdout(void);
 extern void early_init_fdt_scan_reserved_mem(void);
 extern void early_init_fdt_reserve_self(void);
 extern void early_init_dt_add_memory_arch(u64 base, u64 size);
@@ -94,6 +96,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
 extern u64 of_flat_dt_translate_address(unsigned long node);
 extern void of_fdt_limit_memory(int limit);
 #else /* CONFIG_OF_FLATTREE */
+static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
 static inline void early_init_fdt_scan_reserved_mem(void) {}
 static inline void early_init_fdt_reserve_self(void) {}
 static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
-- 
2.10.0