linux-kernel - [PATCH] xtensa: Partially Revert "xtensa: Remove unnecessary of_platform

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Date:	Tue, 26 Jul 2016 13:01:32 -0500
From:	Rob Herring <robh@...nel.org>
To:	Chris Zankel <chris@...kel.net>
Cc:	linux-kernel@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] xtensa: Partially Revert "xtensa: Remove unnecessary of_platform_populate with default match table"

This partially reverts commit 69d99e6c0d62 keeping only the main
purpose of the original commit which is the removal of
of_platform_populate() call. The moving of of_clk_init() caused changes
in the initialization order breaking booting.

Fixes: 69d99e6c0d621f ("xtensa: Remove unnecessary of_platform_populate with default match table")
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
---
This is on top of Guenter's build fix. Please test and I'll apply. I 
tried briefly running under QEMU, but didn't have success. If anyone has 
up to date instructions that would be helpful as using these[1] didn't 
seem to work.

Rob

[1] http://wiki.linux-xtensa.org/index.php/Xtensa_on_QEMU

 arch/xtensa/kernel/setup.c | 9 +++++++++
 arch/xtensa/kernel/time.c  | 2 --
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 6f68c60..143251e 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -22,6 +22,7 @@
 #include <linux/bootmem.h>
 #include <linux/kernel.h>
 #include <linux/percpu.h>
+#include <linux/clk-provider.h>
 #include <linux/cpu.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -251,6 +252,14 @@ void __init early_init_devtree(void *params)
 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 }
 
+static int __init xtensa_device_probe(void)
+{
+	of_clk_init(NULL);
+	return 0;
+}
+
+device_initcall(xtensa_device_probe);
+
 #endif /* CONFIG_OF */
 
 /*
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 6ec73c9..b9ad9fe 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -15,7 +15,6 @@
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/time.h>
-#include <linux/clk-provider.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/interrupt.h>
@@ -149,7 +148,6 @@ void __init time_init(void)
 	local_timer_setup(0);
 	setup_irq(this_cpu_ptr(&ccount_timer)->evt.irq, &timer_irqaction);
 	sched_clock_register(ccount_sched_clock_read, 32, ccount_freq);
-	of_clk_init(NULL);
 	clocksource_probe();
 }
 
-- 
2.9.2