[PATCH] ARM: shmobile: armadillo800eva dts: Correct extal1 frequency to 24 MHz

[PATCH] ARM: shmobile: armadillo800eva dts: Correct extal1 frequency to 24 MHz

[Geert Uytterhoeven]

On r8a7740/armadillo, actual clock rates are ca. 4% lower than reported
by /sys/kernel/debug/clk/clk_summary. Correct the extal1 frequency from
25 MHz to 24 MHz to fix this.

This matches the Armadillo-800 EVA Product Manual, which claims the main
crystal runs at 24 MHz, and the old legacy/reference board code.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
index 5845e4e6c700568f..13d27e3985378552 100644
--- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
+++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
@@ -180,7 +180,7 @@
 };
 
 &extal1_clk {
-	clock-frequency = <25000000>;
+	clock-frequency = <24000000>;
 };
 &extal2_clk {
 	clock-frequency = <48000000>;
-- 
1.9.1

Re: [PATCH] ARM: shmobile: armadillo800eva dts: Correct extal1 frequency to 24 MHz

[Geert Uytterhoeven]

On Fri, Dec 18, 2015 at 11:51 AM, Geert Uytterhoeven
<geert+renesas@glider.be> wrote:
> On r8a7740/armadillo, actual clock rates are ca. 4% lower than reported
> by /sys/kernel/debug/clk/clk_summary. Correct the extal1 frequency from
> 25 MHz to 24 MHz to fix this.
>
> This matches the Armadillo-800 EVA Product Manual, which claims the main
> crystal runs at 24 MHz, and the old legacy/reference board code.

Ping? I think we want this applied to -stable and -ltsi, too.

> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
>  arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> index 5845e4e6c700568f..13d27e3985378552 100644
> --- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> +++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
> @@ -180,7 +180,7 @@
>  };
>
>  &extal1_clk {
> -       clock-frequency = <25000000>;
> +       clock-frequency = <24000000>;
>  };
>  &extal2_clk {
>         clock-frequency = <48000000>;
> --
> 1.9.1

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

Re: [PATCH] ARM: shmobile: armadillo800eva dts: Correct extal1 frequency to 24 MHz

[Simon Horman]

On Tue, Jan 05, 2016 at 02:37:07PM +0100, Geert Uytterhoeven wrote:
> On Fri, Dec 18, 2015 at 11:51 AM, Geert Uytterhoeven
> <geert+renesas@glider.be> wrote:
> > On r8a7740/armadillo, actual clock rates are ca. 4% lower than reported
> > by /sys/kernel/debug/clk/clk_summary. Correct the extal1 frequency from
> > 25 MHz to 24 MHz to fix this.
> >
> > This matches the Armadillo-800 EVA Product Manual, which claims the main
> > crystal runs at 24 MHz, and the old legacy/reference board code.
> 
> Ping? I think we want this applied to -stable and -ltsi, too.

Sorry for letting this slip through the cracks.

I have queued up the following as a fix for v4.5.

From: Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH] ARM: dts: armadillo800eva Correct extal1 frequency to 24 MHz

On r8a7740/armadillo, actual clock rates are ca. 4% lower than reported
by /sys/kernel/debug/clk/clk_summary. Correct the extal1 frequency from
25 MHz to 24 MHz to fix this.

This matches the Armadillo-800 EVA Product Manual, which claims the main
crystal runs at 24 MHz, and the old legacy/reference board code.

Fixes: 25aa7ba3fdfb ("ARM: shmobile: armadillo800eva: Sync DTS")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
index 105d9c95de4a..5c76dcc89df5 100644
--- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
+++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
@@ -180,7 +180,7 @@
 };
 
 &extal1_clk {
-	clock-frequency = <25000000>;
+	clock-frequency = <24000000>;
 };
 &extal2_clk {
 	clock-frequency = <48000000>;
-- 
2.1.4