From: Wolfram Sang <wsa@the-dreams.de>
To: linux-i2c@vger.kernel.org
Cc: linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>,
Simon Horman <horms@verge.net.au>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Wolfram Sang <wsa@the-dreams.de>,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org
Subject: [RFC 1/3] i2c: document binding for multi-master case
Date: Wed, 16 Dec 2015 18:44:18 +0000 [thread overview]
Message-ID: <1450291460-10514-2-git-send-email-wsa@the-dreams.de> (raw)
In-Reply-To: <1450291460-10514-1-git-send-email-wsa@the-dreams.de>
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
We need this binding because some I2C master drivers will need to adapt
their PM settings for the arbitration circuitry. I skipped the "i2c-"
prefix because I can imagine to be useful outside of i2c.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: devicetree@vger.kernel.org
---
Documentation/devicetree/bindings/i2c/i2c.txt | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index a00219f5ee0733..c8d977ed847f3c 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -54,6 +54,11 @@ wants to support one of the below features, it should adapt the bindings below.
"irq" and "wakeup" names are recognized by I2C core, other names are
left to individual drivers.
+- multi-master
+ states that there is another master active on this bus. The OS can use
+ this information to adapt power management to keep the arbitration awake
+ all the time, for example.
+
- wakeup-source
device can be used as a wakeup source.
--
2.1.4
next prev parent reply other threads:[~2015-12-16 18:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-16 18:44 [RFC 0/3] i2c: rcar: adapt PM usage to multi master case Wolfram Sang
2015-12-16 18:44 ` Wolfram Sang [this message]
2015-12-19 4:18 ` [RFC 1/3] i2c: document binding for multi-master case Rob Herring
2015-12-16 18:44 ` [RFC 2/3] i2c: rcar: remove macros dealing with flags Wolfram Sang
2015-12-16 18:44 ` [RFC 3/3] i2c: rcar: disable PM in multi-master mode Wolfram Sang
2015-12-16 18:48 ` Sergei Shtylyov
2015-12-16 21:26 ` [RFC 0/3] i2c: rcar: adapt PM usage to multi master case Geert Uytterhoeven
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