linux-kernel - [PATCH v2 2/3] ARM: DRA7x: dts: Update the OSC_32K

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Date:	Mon, 2 May 2016 12:12:02 -0500
From:	"J.D. Schroeder" <Linux.HWI@...min.com>
To:	<linux-kernel@...r.kernel.org>, <t-kristo@...com>,
	<bcousson@...libre.com>, <tony@...mide.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	<jay.schroeder@...min.com>
Subject: [PATCH v2 2/3] ARM: DRA7x: dts: Update the OSC_32K_CLK frequency

From: "J.D. Schroeder" <jay.schroeder@...min.com>

This commit updates the OSC_32K_CLK (secure_32k_clk_src_ck) frequency
from the precise 32kHz frequency (i.e., 32.768 kHz) to a more
accurate frequency of ~34.6 kHz. Actual measured frequencies of the
clock vary from processor to processor anywhere from 34.4 kHz up to
34.8 kHz. Note that the ~34 kHz frequency clock is generated
internally by the processor, not an input to the processor. This
change makes it more clear that the consumer of the
secure_32k_clk_src_ck will not get a precise 32.768 kHz frequency
output.

Signed-off-by: J.D. Schroeder <jay.schroeder@...min.com>
Reviewed-by: Trenton Andres <trenton.andres@...min.com>
---
 arch/arm/boot/dts/dra7xx-clocks.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi b/arch/arm/boot/dts/dra7xx-clocks.dtsi
index 3f0c61d..f7ec976 100644
--- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
+++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
@@ -95,7 +95,7 @@
 	secure_32k_clk_src_ck: secure_32k_clk_src_ck {
 		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		clock-frequency = <32768>;
+		clock-frequency = <34600>; /* approximate frequency */
 	};

 	sys_clk32_crystal_ck: sys_clk32_crystal_ck {
-- 
1.9.1