* [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz
@ 2019-08-21 1:39 Andrey Smirnov
2019-08-21 15:44 ` Andrew Lunn
2019-08-24 19:25 ` Shawn Guo
0 siblings, 2 replies; 3+ messages in thread
From: Andrey Smirnov @ 2019-08-21 1:39 UTC (permalink / raw)
To: linux-arm-kernel
Cc: Andrey Smirnov, Shawn Guo, Chris Healy, Fabio Estevam, linux-kernel
Fiber-optic modules attached to the bus are only rated to work at
100 kHz, so decrease the bus frequency to accommodate that.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
Changes since [v1]:
- Spelling fixes
[v1] lore.kernel.org/lkml/20190820030804.8892-1-andrew.smirnov@gmail.com
arch/arm/boot/dts/vf610-zii-cfu1.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/vf610-zii-cfu1.dts b/arch/arm/boot/dts/vf610-zii-cfu1.dts
index ff460a1de85a..28732249cfc0 100644
--- a/arch/arm/boot/dts/vf610-zii-cfu1.dts
+++ b/arch/arm/boot/dts/vf610-zii-cfu1.dts
@@ -207,7 +207,7 @@
};
&i2c0 {
- clock-frequency = <400000>;
+ clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c0>;
status = "okay";
--
2.21.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz
2019-08-21 1:39 [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz Andrey Smirnov
@ 2019-08-21 15:44 ` Andrew Lunn
2019-08-24 19:25 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Andrew Lunn @ 2019-08-21 15:44 UTC (permalink / raw)
To: Andrey Smirnov
Cc: linux-arm-kernel, Fabio Estevam, Shawn Guo, linux-kernel, Chris Healy
On Tue, Aug 20, 2019 at 06:39:36PM -0700, Andrey Smirnov wrote:
> Fiber-optic modules attached to the bus are only rated to work at
> 100 kHz, so decrease the bus frequency to accommodate that.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
I took a quick look at some of the SFP standards. 100KHz is part of
the standard. So we should try to remember to keep an eye of this as
other boards are merged.
Andrew
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz
2019-08-21 1:39 [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz Andrey Smirnov
2019-08-21 15:44 ` Andrew Lunn
@ 2019-08-24 19:25 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Shawn Guo @ 2019-08-24 19:25 UTC (permalink / raw)
To: Andrey Smirnov; +Cc: linux-arm-kernel, Chris Healy, Fabio Estevam, linux-kernel
On Tue, Aug 20, 2019 at 06:39:36PM -0700, Andrey Smirnov wrote:
> Fiber-optic modules attached to the bus are only rated to work at
> 100 kHz, so decrease the bus frequency to accommodate that.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
Applied, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-08-21 15:44 ` Andrew Lunn
2019-08-24 19:25 ` Shawn Guo
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