linux-kernel - [PATCH 4.1 45/86] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications

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Date:	Fri,  6 Nov 2015 11:22:44 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Timo Sigurdsson <public_timo.s@...entcreek.de>,
	Iain Paton <ipaton0@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH 4.1 45/86] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Timo Sigurdsson <public_timo.s@...entcreek.de>

commit eaeef1ad9b6ea6df1d1220c254d9563da60cb9d1 upstream.

sun7i-a20.dtsi contains a cpufreq operating point at 0.9 volts. The minimum
CPU voltage for the Allwinner A20 SoC, however, is 1.0 volts. Thus, raise
the voltage for the lowest operating point to 1.0 volts in order to stay
within the SoC specifications. It is an undervolted setting that isn't
stable across all SoCs and boards out there.

Fixes: d96b7161916f ("ARM: dts: sun7i: Add cpu clock reference and
 operating points to dtsi")
Signed-off-by: Timo Sigurdsson <public_timo.s@...entcreek.de>
Acked-by: Iain Paton <ipaton0@...il.com>
Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/sun7i-a20.dtsi |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -111,7 +111,7 @@
 				720000  1200000
 				528000  1100000
 				312000  1000000
-				144000  900000
+				144000  1000000
 				>;
 			#cooling-cells = <2>;
 			cooling-min-level = <0>;


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