[PATCH] powerpc: Add documentation for CPM GPIO banks to booting-without-of
From: Jochen Friedrich <jochen@scram.de>
Date: 2008-07-02 16:08:21
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
Signed-off-by: Jochen Friedrich <jochen@scram.de> --- Documentation/powerpc/booting-without-of.txt | 39 ++++++++++++++++++++++++++ 1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index 26d323f..5fe68ee 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt@@ -2174,6 +2174,45 @@ platforms are moved over to use the flattened-device-tree model. }; }; + xi) GPIO + + Every GPIO controller node must have #gpio-cells property defined, + this information will be used to translate gpio-specifiers. + On CPM1 devices, all ports are using slightly different register layouts. + Ports A, C and D are 16bit ports and Ports B and E are 32bit ports. + On CPM2 devices, all ports are 32bit ports and use a common register layout. + + Properties: + - compatible : "fsl,cpm1-pario-bank-a", "fsl,cpm1-pario-bank-b", + "fsl,cpm1-pario-bank-c", "fsl,cpm1-pario-bank-d", + "fsl,cpm1-pario-bank-e", "fsl,cpm2-pario-bank" + - #gpio-cells : Should be two. The first cell is the pin number and the + second cell is used to specify optional paramters (currently unused). + - gpio-controller : Marks the port as GPIO controller. + + Example of three SOC GPIO banks defined as gpio-controller nodes: + + CPM1_PIO_A: gpio-controller@950 { + #gpio-cells = <2>; + compatible = "fsl,cpm1-pario-bank-a"; + reg = <0x950 0x10>; + gpio-controller; + }; + + CPM1_PIO_B: gpio-controller@ab8 { + #gpio-cells = <2>; + compatible = "fsl,cpm1-pario-bank-b"; + reg = <0xab8 0x10>; + gpio-controller; + }; + + CPM1_PIO_E: gpio-controller@ac8 { + #gpio-cells = <2>; + compatible = "fsl,cpm1-pario-bank-e"; + reg = <0xac8 0x18>; + gpio-controller; + }; + m) Chipselect/Local Bus Properties:
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1.5.6