On 04/15/14 07:53, Doug Anderson wrote:
+ DT ML
Tomasz,
On Mon, Apr 14, 2014 at 3:38 PM, Tomasz Figa<tomasz.figa@xxxxxxxxx> wrote:
Hi Doug,
On 15.04.2014 00:30, Doug Anderson wrote:
Sachin,
On Mon, Apr 14, 2014 at 6:16 AM, Sachin Kamat<sachin.kamat@xxxxxxxxxx>
wrote:
From: Doug Anderson<dianders@xxxxxxxxxxxx>
I probably wouldn't have bothered giving me authorship since this
isn't exactly a clean patch from the chromium tree (you pulled the
proper pieces yourself, did the commit message yourself, etc). ...but
I appreciate the thought and as far as I know setting the "author" in
cases like this is a bit of a judgement call...
The Signed-off-by is certainly correct. ;)
Added i2c-arbitrator pinctrl node to Snow board.
Signed-off-by: Doug Anderson<dianders@xxxxxxxxxxxx>
Signed-off-by: Sachin Kamat<sachin.kamat@xxxxxxxxxx>
---
arch/arm/boot/dts/exynos5250-snow.dts | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
This matches what's in our tree and and is what people are using, so:
Reviewed-by: Doug Anderson<dianders@xxxxxxxxxxxx>
diff --git a/arch/arm/boot/dts/exynos5250-snow.dts
b/arch/arm/boot/dts/exynos5250-snow.dts
index 1ce1088..32715b3 100644
--- a/arch/arm/boot/dts/exynos5250-snow.dts
+++ b/arch/arm/boot/dts/exynos5250-snow.dts
@@ -39,6 +39,22 @@
};
};
+ pinctrl@13400000 {
+ arb_their_claim: arb-their-claim {
+ samsung,pins = "gpe0-4";
+ samsung,pin-function =<0>;
+ samsung,pin-pud =<3>;
+ samsung,pin-drv =<0>;
+ };
+
+ arb_our_claim: arb-our-claim {
+ samsung,pins = "gpf0-3";
+ samsung,pin-function =<1>;
+ samsung,pin-pud =<0>;
+ samsung,pin-drv =<0>;
+ };
It's odd to me that one of these has a pullup but not the other, but I
think that's because the arbitration lines ended up using some other
signals that were originally hooked up for other usage. Certainly the
pullups / pulldowns match what's in our tree and also match what we
had in the original shipping 3.4 kernel.
Just a wild guess, but probably the input needs a pull-up, while obviously
the output doesn't. I don't have much idea about the arbitration thing
happening on snow, so I can't say much about this series. (Maybe description
of patch 1/4 should be saying a bit more about the meaning of this?)
Right, of course. I'm not sure quite what I was thinking. I think I
was getting confused since these go through level converters and my
brain was in open drain mode. ...but looking at this again this looks
reasonable.
I think the whole discussion of arbitration was from a long time ago.
I think it's fairly well documented in the "i2c-arb-gpio-challenge"
driver.
Basically it looks like Sachin is getting pinctrl stuff matched up
properly for the device tree that's upstream.
Sounds OK to me.
Tomasz, do you have any concerns still?
Thanks,
Kukjin
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