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[3/3] ARM: dts: r8a7793: Correct critical CPU temperature

Message ID 1513242521-11236-4-git-send-email-chris.paterson2@renesas.com (mailing list archive)
State Accepted
Commit 1dfc65cef481ac6af64380f26186d5cc585b46eb
Delegated to: Simon Horman
Headers show

Commit Message

Chris Paterson Dec. 14, 2017, 9:08 a.m. UTC
The R-Car M2N hardware manual states that Tc = –40°C to +105°C. The
thermal sensor has an accuracy of ±5°C and there can be a temperature
difference of 1 or 2 degrees between Tjmax and the thermal sensor due
to the location of the latter.

This means that 95°C is a safer value to use.

Fixes: 57f9156bc620ac56 ("ARM: dts: r8a7793: enable to use thermal-zone")
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
---
 arch/arm/boot/dts/r8a7793.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Geert Uytterhoeven Dec. 14, 2017, 10:25 a.m. UTC | #1
On Thu, Dec 14, 2017 at 10:08 AM, Chris Paterson
<chris.paterson2@renesas.com> wrote:
> The R-Car M2N hardware manual states that Tc = –40°C to +105°C. The

M2-N

> thermal sensor has an accuracy of ±5°C and there can be a temperature
> difference of 1 or 2 degrees between Tjmax and the thermal sensor due
> to the location of the latter.
>
> This means that 95°C is a safer value to use.
>
> Fixes: 57f9156bc620ac56 ("ARM: dts: r8a7793: enable to use thermal-zone")
> Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
diff mbox

Patch

diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index 61dd291d907da2f5..039b225175262e4b 100644
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -89,7 +89,7 @@ 
 
 			trips {
 				cpu-crit {
-					temperature	= <115000>;
+					temperature	= <95000>;
 					hysteresis	= <0>;
 					type		= "critical";
 				};