linux-kernel - [PATCH] ARM: dts: Disable the RTC by default on exynos5

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Date:	Mon,  8 Apr 2013 09:58:15 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Olof Johansson <olof@...om.net>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	linux-samsung-soc@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>,
	Russell King <linux@....linux.org.uk>,
	Jingoo Han <jg1.han@...sung.com>,
	Padmavathi Venna <padma.v@...sung.com>,
	Giridhar Maruthy <giridhar.m@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: Disable the RTC by default on exynos5

This change makes the rtc on the exynos5250 and 5440 disabled by
default to match exynos4.

Ever since the common clock framework came in came in, exynos5250
boards have dumped lots of warnings in the boot log.  It turns out
that we don't see those on exynos4 since the rtc is disabled by
default.  While we need to get to the bottom of the problems with the
RTC, it still makes sense to have the default state of the RTC on
exynos boards match.

For the record, warnings look like this:
  ------------[ cut here ]------------
  WARNING: at /.../drivers/clk/clk.c:771 __clk_enable+0x34/0xb0()
  Modules linked in:
  [<80015bfc>] (unwind_backtrace+0x0/0xec) from [<804717f0>] (dump_stack+0x20/0x24)
  [<804717f0>] (dump_stack+0x20/0x24) from [<80023cd0>] (warn_slowpath_common+0x5c/0x7c)
  [<80023cd0>] (warn_slowpath_common+0x5c/0x7c) from [<80023d1c>] (warn_slowpath_null+0x2c/0x34)
  [<80023d1c>] (warn_slowpath_null+0x2c/0x34) from [<8035ddb0>] (__clk_enable+0x34/0xb0)
  [<8035ddb0>] (__clk_enable+0x34/0xb0) from [<8035de54>] (clk_enable+0x28/0x3c)
  [<8035de54>] (clk_enable+0x28/0x3c) from [<8031a160>] (s3c_rtc_probe+0xf4/0x434)
  [<8031a160>] (s3c_rtc_probe+0xf4/0x434) from [<8028e288>] (platform_drv_probe+0x24/0x28)
  [<8028e288>] (platform_drv_probe+0x24/0x28) from [<8028ce10>] (driver_probe_device+0xbc/0x22c)
  [<8028ce10>] (driver_probe_device+0xbc/0x22c) from [<8028cff8>] (__driver_attach+0x78/0x9c)
  [<8028cff8>] (__driver_attach+0x78/0x9c) from [<8028bdfc>] (bus_for_each_dev+0x64/0xac)
  [<8028bdfc>] (bus_for_each_dev+0x64/0xac) from [<8028c7e0>] (driver_attach+0x28/0x30)
  [<8028c7e0>] (driver_attach+0x28/0x30) from [<8028c43c>] (bus_add_driver+0xe0/0x234)
  [<8028c43c>] (bus_add_driver+0xe0/0x234) from [<8028d55c>] (driver_register+0xac/0x13c)
  [<8028d55c>] (driver_register+0xac/0x13c) from [<8028e4f4>] (platform_driver_register+0x54/0x68)
  [<8028e4f4>] (platform_driver_register+0x54/0x68) from [<8065c944>] (s3c_rtc_driver_init+0x14/0x1c)
  [<8065c944>] (s3c_rtc_driver_init+0x14/0x1c) from [<800086d8>] (do_one_initcall+0x60/0x138)
  [<800086d8>] (do_one_initcall+0x60/0x138) from [<80633a8c>] (kernel_init_freeable+0x108/0x1d0)
  [<80633a8c>] (kernel_init_freeable+0x108/0x1d0) from [<8046d2f8>] (kernel_init+0x1c/0xf4)
  [<8046d2f8>] (kernel_init+0x1c/0xf4) from [<8000e358>] (ret_from_fork+0x14/0x20)
  ---[ end trace 4bcdc801c868d73f ]---

Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 arch/arm/boot/dts/exynos5250.dtsi | 1 +
 arch/arm/boot/dts/exynos5440.dtsi | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
index dc55e33..892b724 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -183,6 +183,7 @@
 		interrupts = <0 43 0>, <0 44 0>;
 		clocks = <&clock 337>;
 		clock-names = "rtc";
+		status = "disabled";
 	};
 
 	tmu@...60000 {
diff --git a/arch/arm/boot/dts/exynos5440.dtsi b/arch/arm/boot/dts/exynos5440.dtsi
index 25c6134..a8ceef4 100644
--- a/arch/arm/boot/dts/exynos5440.dtsi
+++ b/arch/arm/boot/dts/exynos5440.dtsi
@@ -181,5 +181,6 @@
 		interrupts = <0 17 0>, <0 16 0>;
 		clocks = <&clock 21>;
 		clock-names = "rtc";
+		status = "disabled";
 	};
 };
-- 
1.8.1.3

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