Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson:
> We should be able to talk to the PMIC at 400kHz. No need to talk at
> the slow 100kHz.
>
> As measured by ftrace (with a bunch of extra patches, since cpufreq
> for rk808 hasn't landed yet):
> before this change: cpu0_set_target() => ~500us
> after this change: cpu0_set_target() => ~300us
>
> Signed-off-by: Doug Anderson
looks harmless :-)
I've added it to my v3.18-next/dts branch with Addy's tags
> ---
> arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
> b/arch/arm/boot/dts/rk3288-evb-rk808.dts index 36db177..ff522f8 100644
> --- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
> +++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
> @@ -18,6 +18,7 @@
> };
>
> {
> + clock-frequency = <40>;
> status = "okay";
>
> rk808: pmic@1b {
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Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
On 11 Sep 2014 12:30, Doug Anderson writes:
> We should be able to talk to the PMIC at 400kHz. No need to talk at
> the slow 100kHz.
>
> As measured by ftrace (with a bunch of extra patches, since cpufreq
> for rk808 hasn't landed yet):
> before this change: cpu0_set_target() => ~500us
> after this change: cpu0_set_target() => ~300us
>
> Signed-off-by: Doug Anderson
> ---
> arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
> b/arch/arm/boot/dts/rk3288-evb-rk808.dts
> index 36db177..ff522f8 100644
> --- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
> +++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
> @@ -18,6 +18,7 @@
> };
>
> {
> + clock-frequency = <40>;
> status = "okay";
>
> rk808: pmic@1b {
I have tested on rk3288-pinky board, it work well. so
Reviewed-by Addy Ke
Tested-by Addy Ke
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Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
On 11 Sep 2014 12:30, Doug Anderson writes:
We should be able to talk to the PMIC at 400kHz. No need to talk at
the slow 100kHz.
As measured by ftrace (with a bunch of extra patches, since cpufreq
for rk808 hasn't landed yet):
before this change: cpu0_set_target() = ~500us
after this change: cpu0_set_target() = ~300us
Signed-off-by: Doug Anderson diand...@chromium.org
---
arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
b/arch/arm/boot/dts/rk3288-evb-rk808.dts
index 36db177..ff522f8 100644
--- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
+++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
@@ -18,6 +18,7 @@
};
i2c0 {
+ clock-frequency = 40;
status = okay;
rk808: pmic@1b {
I have tested on rk3288-pinky board, it work well. so
Reviewed-by Addy Ke addy...@rock-chips.com
Tested-by Addy Ke addy...@rock-chips.com
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Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson:
We should be able to talk to the PMIC at 400kHz. No need to talk at
the slow 100kHz.
As measured by ftrace (with a bunch of extra patches, since cpufreq
for rk808 hasn't landed yet):
before this change: cpu0_set_target() = ~500us
after this change: cpu0_set_target() = ~300us
Signed-off-by: Doug Anderson diand...@chromium.org
looks harmless :-)
I've added it to my v3.18-next/dts branch with Addy's tags
---
arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
b/arch/arm/boot/dts/rk3288-evb-rk808.dts index 36db177..ff522f8 100644
--- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
+++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
@@ -18,6 +18,7 @@
};
i2c0 {
+ clock-frequency = 40;
status = okay;
rk808: pmic@1b {
--
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[PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
We should be able to talk to the PMIC at 400kHz. No need to talk at
the slow 100kHz.
As measured by ftrace (with a bunch of extra patches, since cpufreq
for rk808 hasn't landed yet):
before this change: cpu0_set_target() => ~500us
after this change: cpu0_set_target() => ~300us
Signed-off-by: Doug Anderson
---
arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
b/arch/arm/boot/dts/rk3288-evb-rk808.dts
index 36db177..ff522f8 100644
--- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
+++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
@@ -18,6 +18,7 @@
};
{
+ clock-frequency = <40>;
status = "okay";
rk808: pmic@1b {
--
2.1.0.rc2.206.gedb03e5
--
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[PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
We should be able to talk to the PMIC at 400kHz. No need to talk at
the slow 100kHz.
As measured by ftrace (with a bunch of extra patches, since cpufreq
for rk808 hasn't landed yet):
before this change: cpu0_set_target() = ~500us
after this change: cpu0_set_target() = ~300us
Signed-off-by: Doug Anderson diand...@chromium.org
---
arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts
b/arch/arm/boot/dts/rk3288-evb-rk808.dts
index 36db177..ff522f8 100644
--- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
+++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
@@ -18,6 +18,7 @@
};
i2c0 {
+ clock-frequency = 40;
status = okay;
rk808: pmic@1b {
--
2.1.0.rc2.206.gedb03e5
--
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