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authorJochen Friedrich <jochen@scram.de>2008-07-02 12:06:13 -0400
committerKumar Gala <galak@kernel.crashing.org>2008-07-14 08:55:39 -0400
commita5d28c8e64ff0bc77d38d9c19c6d8163e4c0ffaa (patch)
treef0b85adf4a897eca1567826202f1176f7b8554de /Documentation/powerpc/booting-without-of.txt
parentdc320815305c5f019672d144f4c4c2710ef7732e (diff)
powerpc/CPM: Add i2c pins to dts and board setup
Initialize I2C pins on boards with CPM1/CPM2 controllers and document the i2c bus in booting-without-of. The boards don't have any I2C chips connected to the I2C bus, so unless some external chips are connected to the boards, this code is just an example of setting everything else up. Signed-off-by: Jochen Friedrich <jochen@scram.de> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'Documentation/powerpc/booting-without-of.txt')
-rw-r--r--Documentation/powerpc/booting-without-of.txt42
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index b68684d39f96..f6394b509430 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -2160,6 +2160,48 @@ platforms are moved over to use the flattened-device-tree model.
2160 }; 2160 };
2161 }; 2161 };
2162 2162
2163 x) I2C
2164
2165 The I2C controller is expressed as a bus under the CPM node.
2166
2167 Properties:
2168 - compatible : "fsl,cpm1-i2c", "fsl,cpm2-i2c"
2169 - reg : On CPM2 devices, the second resource doesn't specify the I2C
2170 Parameter RAM itself, but the I2C_BASE field of the CPM2 Parameter RAM
2171 (typically 0x8afc 0x2).
2172 - #address-cells : Should be one. The cell is the i2c device address with
2173 the r/w bit set to zero.
2174 - #size-cells : Should be zero.
2175 - clock-frequency : Can be used to set the i2c clock frequency. If
2176 unspecified, a default frequency of 60kHz is being used.
2177 The following two properties are deprecated. They are only used by legacy
2178 i2c drivers to find the bus to probe:
2179 - linux,i2c-index : Can be used to hard code an i2c bus number. By default,
2180 the bus number is dynamically assigned by the i2c core.
2181 - linux,i2c-class : Can be used to override the i2c class. The class is used
2182 by legacy i2c device drivers to find a bus in a specific context like
2183 system management, video or sound. By default, I2C_CLASS_HWMON (1) is
2184 being used. The definition of the classes can be found in
2185 include/i2c/i2c.h
2186
2187 Example, based on mpc823:
2188
2189 i2c@860 {
2190 compatible = "fsl,mpc823-i2c",
2191 "fsl,cpm1-i2c";
2192 reg = <0x860 0x20 0x3c80 0x30>;
2193 interrupts = <16>;
2194 interrupt-parent = <&CPM_PIC>;
2195 fsl,cpm-command = <0x10>;
2196 #address-cells = <1>;
2197 #size-cells = <0>;
2198
2199 rtc@68 {
2200 compatible = "dallas,ds1307";
2201 reg = <0x68>;
2202 };
2203 };
2204
2163 m) Chipselect/Local Bus 2205 m) Chipselect/Local Bus
2164 2206
2165 Properties: 2207 Properties: