Patchwork i2c-cpm: Add flexibility for I2C clock frequency and filter.

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Submitter Mike Ditto
Date Oct. 31, 2008, 9:19 p.m.
Message ID <490B7672.3040904@consentry.com>
Download mbox | patch
Permalink /patch/6747/
State Superseded, archived
Headers show

Comments

Mike Ditto - Oct. 31, 2008, 9:19 p.m.
Jochen Friedrich wrote:
> What needs to be done though is to document this change in
> Documentation/powerpc/dts-bindings/fsl/cpm_qe/cpm/i2c.txt.

How about the below?

I'll wait for David to comment on the property name and for any suggestions
on the documentation below, then I'll submit a new patch.

Patch

--- linux/Documentation/powerpc/dts-bindings/fsl/cpm_qe/cpm/i2c.txt	11 Oct 2008 02:49:31 -0000	1.1.1.1
+++ linux/Documentation/powerpc/dts-bindings/fsl/cpm_qe/cpm/i2c.txt	31 Oct 2008 21:15:06 -0000
@@ -10,8 +10,12 @@ 
 - #address-cells : Should be one. The cell is the i2c device address with
   the r/w bit set to zero.
 - #size-cells : Should be zero.
-- clock-frequency : Can be used to set the i2c clock frequency. If
-  unspecified, a default frequency of 60kHz is being used.
+- clock-frequency : Can be used to set the desired i2c clock frequency (in Hz).
+  If unspecified, a default of 60 kHz is being used.  The actual frequency may
+  be somewhat higher than this value, depending on how the BRG_CLK and dividers
+  work out.
+- clock-filter : boolean; if defined, indicates that this controller
+  should enable the SCL digital filter.
 The following two properties are deprecated. They are only used by legacy
 i2c drivers to find the bus to probe:
 - linux,i2c-index : Can be used to hard code an i2c bus number. By default,