diff mbox

[tiL4.4-P] ARM: dts: am437x-sk-evm: Reduce i2c0 bus speed for tps65218

Message ID 1465971211-15994-1-git-send-email-j-keerthy@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

J, KEERTHY June 15, 2016, 6:13 a.m. UTC
From: Dave Gerlach <d-gerlach@ti.com>

Based on the latest timing specifications for the TPS65218 from the data
sheet, http://www.ti.com/lit/ds/symlink/tps65218.pdf, document SLDS206
from November 2014, we must change the i2c bus speed to better fit within
the minimum high SCL time required for proper i2c transfer.

When running at 400khz, measurements show that SCL spends
0.8125 uS/1.666 uS high/low which violates the requirement for minimum
high period of SCL provided in datasheet Table 7.6 which is 1 uS.
Switching to 100khz gives us 5 uS/5 uS high/low which both fall above
the minimum given values for 100 khz, 4.0 uS/4.7 uS high/low.

Without this patch occasionally a voltage set operation from the kernel
will appear to have worked but the actual voltage reflected on the PMIC
will not have updated, causing problems especially with cpufreq that may
update to a higher OPP without actually raising the voltage on DCDC2,
leading to a hang.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Aparna Balasubramanian <aparnab@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
---
 arch/arm/boot/dts/am437x-sk-evm.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Keerthy June 15, 2016, 6:15 a.m. UTC | #1
On Wednesday 15 June 2016 11:43 AM, Keerthy wrote:
> From: Dave Gerlach <d-gerlach@ti.com>
>
> Based on the latest timing specifications for the TPS65218 from the data
> sheet, http://www.ti.com/lit/ds/symlink/tps65218.pdf, document SLDS206
> from November 2014, we must change the i2c bus speed to better fit within
> the minimum high SCL time required for proper i2c transfer.
>
> When running at 400khz, measurements show that SCL spends
> 0.8125 uS/1.666 uS high/low which violates the requirement for minimum
> high period of SCL provided in datasheet Table 7.6 which is 1 uS.
> Switching to 100khz gives us 5 uS/5 uS high/low which both fall above
> the minimum given values for 100 khz, 4.0 uS/4.7 uS high/low.
>
> Without this patch occasionally a voltage set operation from the kernel
> will appear to have worked but the actual voltage reflected on the PMIC
> will not have updated, causing problems especially with cpufreq that may
> update to a higher OPP without actually raising the voltage on DCDC2,
> leading to a hang.

I will resend with proper $Subject. Sorry for the noise. Please ignore 
this patch.

>
> Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
> Signed-off-by: Nishanth Menon <nm@ti.com>
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> Signed-off-by: Aparna Balasubramanian <aparnab@ti.com>
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> ---
>   arch/arm/boot/dts/am437x-sk-evm.dts | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/am437x-sk-evm.dts b/arch/arm/boot/dts/am437x-sk-evm.dts
> index 18a3445..5f67001 100644
> --- a/arch/arm/boot/dts/am437x-sk-evm.dts
> +++ b/arch/arm/boot/dts/am437x-sk-evm.dts
> @@ -490,7 +490,7 @@
>   	status = "okay";
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&i2c0_pins>;
> -	clock-frequency = <400000>;
> +	clock-frequency = <100000>;
>
>   	tps@24 {
>   		compatible = "ti,tps65218";
>
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diff mbox

Patch

diff --git a/arch/arm/boot/dts/am437x-sk-evm.dts b/arch/arm/boot/dts/am437x-sk-evm.dts
index 18a3445..5f67001 100644
--- a/arch/arm/boot/dts/am437x-sk-evm.dts
+++ b/arch/arm/boot/dts/am437x-sk-evm.dts
@@ -490,7 +490,7 @@ 
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c0_pins>;
-	clock-frequency = <400000>;
+	clock-frequency = <100000>;
 
 	tps@24 {
 		compatible = "ti,tps65218";