linux-kernel - [PATCH v3 2/5] of: Add nvidia,controller-id property to Tegra I2C bindings

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Message-Id: <1409993685-21911-3-git-send-email-cyndis@kapsi.fi>
Date:	Sat,  6 Sep 2014 11:54:42 +0300
From:	Mikko Perttunen <cyndis@...si.fi>
To:	swarren@...dotorg.org, thierry.reding@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org, wni@...dia.com,
	Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH v3 2/5] of: Add nvidia,controller-id property to Tegra I2C bindings

From: Mikko Perttunen <mperttunen@...dia.com>

Sometimes, hardware blocks want to issue requests to devices
connected to I2C buses by itself. In such case, the bus the
target device resides on must be configured into a register.
For this purpose, each I2C controller has a defined ID known
by the hardware. Add a property for these IDs to the device tree
bindings, so that drivers can know what ID to write to a hardware
register when configuring a block that sends I2C messages autonomously.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
Reviewed-by: Wei Ni <wni@...dia.com>
Tested-by: Wei Ni <wni@...dia.com>
---
 Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
index 87507e9..e9e5994 100644
--- a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt
@@ -57,6 +57,10 @@ Required properties:
   - rx
   - tx
 
+Optional properties:
+- nvidia,controller-id: ID of controller when referred to in
+                        hardware registers.
+
 Example:
 
 	i2c@...0c000 {
@@ -71,5 +75,6 @@ Example:
 		reset-names = "i2c";
 		dmas = <&apbdma 16>, <&apbdma 16>;
 		dma-names = "rx", "tx";
+		nvidia,controller-id = <0>;
 		status = "disabled";
 	};
-- 
2.1.0

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