linux-kernel - [PATCH v2 2/5] of: Add nvidia,controller-id property to Tegra I2C bindings

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Message-ID: <1407933685-12404-3-git-send-email-mperttunen@nvidia.com>
Date:	Wed, 13 Aug 2014 15:41:22 +0300
From:	Mikko Perttunen <mperttunen@...dia.com>
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 v2 2/5] of: Add nvidia,controller-id property to Tegra I2C bindings

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>
---
 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";
 	};
-- 
1.8.1.5

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