diff mbox

[RFC,1/3] i2c: document binding for multi-master case

Message ID 1450291460-10514-2-git-send-email-wsa@the-dreams.de (mailing list archive)
State RFC
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Wolfram Sang Dec. 16, 2015, 6:44 p.m. UTC 
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(+)

Comments

Rob Herring (Arm) Dec. 19, 2015, 4:18 a.m. UTC | #1 
On Wed, Dec 16, 2015 at 07:44:18PM +0100, Wolfram Sang wrote:
> 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(+)

Acked-by: Rob Herring <robh@kernel.org>
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diff mbox

Patch

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.